Karai

Oroku Karai (born Hamato Miwa) is an antagonist-turned-protagonist in Teenage Mutant Ninja Turtles. She was originally the biological daughter of Splinter. Now, she is a 16-year-old master Kunoichi, adopted into The Foot Clan by Shredder as his daughter until her discovery of her true heritage in The Hamato Clan and the Ninja Turtles.

History
Born in 1996 to Hamato Yoshi and Tang Shen, Hamato Miwa and her family once lived in complete harmony until Yoshi's adoptive brother Oroku Saki made an attack on their home in the middle of the night and sought to battle Yoshi to the death. Some flaming candles were struck with a clawed-weapon and the fight caused a fire to break out, killing Tang Shen in the process. Yoshi had thought Miwa had died in the fire as well, but unbeknownst to him, for revenge purposes, Saki had kidnapped her, feeling he should take something from his former friend since hetook something from him; the love of Tang Shen. Since then, Saki, renamed in his birth clan as the Shredder, had renamed her Karai, raised her as his very own daughter, trained her in the ways of Ninjutsu, and fed her tons of lies about what happened to Tang Shen. Presumably, one of these lies was that he and Tang Shen were the ones together and that it was Splinter who caused the immense fire. However, as the love interest of Leonardo, she discovered her true heritage in the Hamato Clan and got mutated into a serpent while facing Shredder alone.

In her debut episode, "New Girl in Town", she tries tempting Leonardo to be more like her, while Leo wants her to see she's not as bad as she appears. Karai confronts Leo, who is separated from his brothers when he and Raphael have a heated argument over who should be their leader. During their first battle, she temporarily blinds him before attacking him. However, she leaves him alive. She later runs into him again in an alley and duels him again. They both exchange some witty (and flirtatious) banter and some non-fatal blows until Karai holds a sword against Leo's neck, trying to convince him that he's giving him any more information other than she wants to show's not as good as he appears. She also notes during her duel with Leonardo that she understands the Shredder's revenge, but she's uninterested. And that, she jokingly stated, he (the Shredder) should get a hobby. She tells Leo to meet her at the top of a building to show him something. At midnight, Leo meets Karai on top of the building she informed him about earlier. She tells him that they're there to steal a famous katana, which is clearly visible in a museum window down below. Leo refuses to help her which upsets her. Before she takes out her katana, Leo stops her and tells her that he believes that there's good inside her. In disbelief Karai betrays Leo by using his feelings for her against him. She violently knocks Leo to the ground, pinning him down. Raphael then shows up, and is angry at him for "holding hands with the Foot." Upon Snakeweed's attack, she just stood there, until Leo begs for her help. She flings her knife towards Leo's face, and it lands on the wall very close to his head. Leo uses it to cut himself free, and he and Raph successfully freeze Snakeweed and smash his frozen corpse to bits. Whether this action by Karai was to help Leo or harm him is unknown, however, Karai did snicker and slip away, implying that she held ulterior motives.

Karai meets with The Shredder, who is not happy that she let Leo live. It is implied that Karai may have had feelings for Leo by sparing him and lying about it, as she tries to talk her way out of it and say that he escaped, but Shredder doesn't believe her. He unsheathes his claws, coercing her that she must kill him next time, or else... Their scene ends with Karai reluctantly obeying and calling him "father" (a shockingly intriguing moment, implying that she is most likely Shredder's "daughter") as she becomes frightened after making The Shredder angry at one of her comments.

In "The Alien Agenda", Karai finds the Turtles fighting the Kraang. She becomes somewhat concerned over The Kraang, yet intrigued. When she informs The Shredder of this, she tries to convince him to take some concern over them, due to the mutations that happened to the Turtles, Xever and Chris Bradford. Shredder believes that this is all nonsense, and dismisses her suggestions. She becomes relatively disappointed that her adoptive father has no interests or concern over The Kraang. Shredder then reminds his daughter of his reason for his ongoing vendetta against Splinter. To find out more about The Kraang, she questions Leonardo when the two happen to encounter each other on a rooftop, during which she mischievously duels and playfully flirts with him. But he refuses to tell her anything, warning her that the robots are dangerous, while also telling her to leave him and his brothers alone. Raphael asks Leonardo about her, and if they should tell the other two brothers about her and his "relationship", but Leonardo says that the two already had a 'chat' and confirmed that she's going to leave them alone. Raphael thinks that telling her to back off is a pointless idea. She keeps it to a point, as she followed the 4 brothers into The Worldwide Genome Project (which is actually run by The Kraang in secret) building, seemingly undetected. However, when the Turtles realize that Raph was missing, he has found Karai and pins her down. The two fight, but it's not long before Leonardo breaks up the skirmish. When Raph makes a comment, Leonardo argues that Karai is good, while Raphael thinks she's pure evil, while Michelangelo and Donatello are confused by who she even is. The fight gathers The Kraang's attention, and they attempt to subdue them. Karai makes the fight worse by recklessly, yet deliberately and malevolently unleashing a monster containing DNA from assorted animals. She then grabs a broken Kraang droid, and selfishly abandons the Turtles, and brings it to her father to possibly convince him that The Kraang are worthy of looking into. Also, Baxter Stockman claims that he could work with the technology efficiently. The Shredder's mindset has successfully been changed, and he asks her to find out everything she can about the Kraang.

In "Enemy of My Enemy", Karai appears out of nowhere while the Turtles are surveying the T.C.R.I. building. She immediately pulls out her katana and attacks Leo, Raph, Donnie, and Mikey all join in to fight her, but she quickly begins to outmatch them. She mentions that she overheard Donnie talking about The Kraang. At first, they don't want to let her in on the situation, but Raph lets lose that they are trying to stop a full-scale invasion. Suddenly, a flash of purple light comes from the T.C.R.I. building. A door opens on a side of the skyscraper, and a strange aircraft floats out, resembling a jellyfish, with a round body, three short, stubby tentacles and a single purple "eye". It is piloted by two Kraang brains, who quickly spot the turtles and Karai and move in to attack. The ninjas run across the rooftops, narrowly avoiding the ship's energy beam weapon. Karai ducks into an alley, while the ship pursues the turtles. Leo runs out to draw the ship's fire, while the other three make it to the sewers. Leo joins them and they watch the ship from a storm drain. The ship activates a cloaking device and vanishes to avoid detection by a passing Police helicopter. Karai returns to The Foot's headquarters and reports what she has seen to The Shredder. He ignores the threat that The Kraang pose, and tells her that they will soon receive a shipment of new weapons that will end their war with the turtles and Splinter. Later, after a brief, yet playful spar with Leonardo, she tells him that she wants to help them fight The Kraang. She is afraid that Shredder's stubborn refusal to see anything beyond his vengeance will get them all into big trouble. She asks him if they could work together, but Leo refuses and leaves. Later, the ship chases the Shellraiser down a street. Leo asks Mikey for an escape route and Mikey accidentally leads them into a dead end. The ship starts to blast through the Shellraiser, but they turtles narrowly avoid definite annihilation by backing out of the alley quickly and hitting the streets once again. Karai then jumps out of nowhere onto the top of the ship and effortlessly, begins slamming her katana on it. Leo decides to help her out, and he jumps into The Shell Cycle and chases her and the ship down on his own. When Karai falls off of the ship, Leo saves her at the last possible second. He then brings her into The Shellraiser. When Raph instantaneously objects to her presence, Leo tells him to hear her out. Karai tells them that they need her help and that the only way to take that ship down is with a missile launcher from the Foot shipment, which she tells them will be arriving at the docks the next evening. All of the turtles except Leo are suspicious of her, so Karai says that she will get the missile launcher herself. Leo agrees that, if she gets the weapon, the turtles will team up with her to stop the ship. Secretly, however, the turtles devise a plan to eliminate The Shredder, as he would never be expecting them to show up there. As Karai retrieves the missile launcher, she spots the turtles on top of a shipping container near the docks. She pushes her adoptive father out of the way so that the electric grenade (which Donnie invented) electrocutes the Foot Soldiers and the man with the diamond eye (who was the one who brought the shipment). Karai then fires at the turtles, knocking them off the container. Leo makes it to the box of missile launchers, but is confronted by Karai. She tells him that she feels betrayed and that he is just as short-sighted and obsessed as The Shredder. She then reveals to Leo that The Shredder is her father (apparently). Leo is shocked by this news. Karai says that the deal is off and violently attacks Leo. After a short fight the ship returns and Karai hides from it. When she emerges, she finds that Leo has already taken a missile launcher and gone after the ship. Meanwhile, the other three turtles are fighting against The Shredder, but are miserably losing (much like the prior time). Meanwhile, Leo takes aim and fires a missile at the ship. The missile hits its target and the ship crashes into the wharf, knocking Shredder into the ocean. Karai dives in after him, while the turtles retreat. Karai helps The Shredder out of the water. He thanks her, and tells her that he has found a pet for her and holds up a Kraang, which he has captured.

In "Karai's Vendetta", Shredder's interrogation of the captive Kraang proves futile, as it does nothing but senseless squealing. Karai suggests putting the Kraang into the limbless exo-suit they possess. Upon hearing it speaking relatively sensible english, the Kraang stated that they hunt the turtles because the latter protect April O'Neil, who is crucial to their plans. Thus, Shredder dispatches Karai to capture April to draw the turtles out. She meets April under the alias "Harmony". She then reveals her identity when trying to feed April turtle soup. April forces Karai to pursue her on foot, but she traps herself in an alley. She pulls out her weapon and Karai compliments on it before disarming her. April tries attacking her directly, but Karai dodges her attacks and starts attacking her, easily overpowering her. She knocks her into the street and demands to know why she's so important as she continues attacking her. April is able to defend herself and provide her own questions. However, just when Karai has her pinned, she mentions losing her mother, causing Karai to hesitate which distracts her long enough for April to throw her down the subway stairs and escape.

In "Showdown, Part 1", Karai leads a squad of foot soldiers into the sewers, where they abduct April after she is led away from the Turtles' lair by her brainwashed father, Kirby O'Neil. she then helps lead the Foot to the surface where they hand April over to the Kraang.

Later in "Showdown, Part 2", Karai intervenes in Shredder and Splinter's battle just as Splinter is about to kill her "father". Prior to this, Shredder had revealed to Splinter that after their last battle, fifteen years ago, he had taken Splinter's daughter, Miwa, and raised her as his own. Splinter recognizes Karai as Miwa during their brief confrontation, and when Shredder informs her that the rat is Hamato Yoshi, Karai accuses Splinter of murdering her mother, another lie told to her by the Shredder. She attacks Splinter, but her true father refuses to fight her, and leaves the lair upset on what the Shredder has done to his daughter.

In "The Mutation Situation" (which also marks her first non-speaking role in the series), she walks up to the Shredder's throne while he puts his helmet on. She then sets up a projection screen that was recently provided by the Kraang. The Kraang then inform them that their mutagen shipment is ready and is on it's way to them [as they plan to use it to build an army of mutants to destroy splinter and the turtles]. They then inform them that they have a secret weapon that will combat any interferences; a large foot of some kind of ape creature then appears on the screen. After a while, the shredder asks the Kraang where is shipment is. The Kraang then informs him that the turtles have either destroyed or sent their ship off-course to which they state that they will somehow make amends. The Shredder then tells Karai that the Kraang have become useless and that he will clearly have to expand his army on his own.

In "Follow the Leader", she becomes very interested in the Turtles hunt for the dozens of mutagen canisters scattered across NYC and forms a plan to trap them. She is later seen looking at a torn photograph of her late mother when she is ambushed the new Footbots, a latest invention of the Kraang for Oroku Saki. Although overpowered by their impressive fighting techniques, Shredder emerges to inform her that he is leaving for Japan to take care of "urgent business." He warns her not to make any moves against the Turtles until his return to New York, that obedience comes with a stiff penalty. Karai is set upon by robotic Foot ninja, which were designed by the Kraang to adapt to their opponent's moves. When she was at the robots' mercy, Shredder intervenes. Karai asks if he was going to let the Foot Bots kill, to which he doesn't answer. Shredder then says he's leaving for Japan on business and warned her not to make any moves against the Turtles. But she disobeys him, seizes and captures Leo, abducting him to Bradford's dojo. While having him in her custody, she intimidates him in several ways: threatening to expose his existence to the human society so she can make a fortune; taunting and humiliating him by vengefully and malevolently ranting that Leo deserves everything he's getting before ruthlessly coercing him to battle the Footbots. When his brothers rescue him and escape, Karai catches up with Leo and nearly pushes him off of a building. However, Leo avoids falling by sticking his katana into the ledge, and he jumps behind Karai, catching her unaware. She falls to the ground, where Leo holds a sword to her head and tells her that Shredder is lying to her and that Splinter did not kill her mother, while also ordering her to stay away from his brothers and keep the feud between her and him. As he leaves, he gives one last plea for Karai to believe him about Splinter. Despite all this, Karai is still suspicious and angry at Leo about Splinter and doesn't look threatened by Leo's orders. She also glares at Leo, who escapes to safety with his brothers, implying that she will continue to come after them.

In "Mikey Gets Shellacne", Karai dispatches Dogpound and Fishface to find Baxter Stockman so he can maintain her Foot Bots. She later finds her two subordinates, Dogpound mutated into Rahzar, in Baxter's old lab and tells the good doctor that he works for her and the Shredder.

In "Target: April O'Neil", Shredder is very unhappy that Karai disobeyed him and sought out the Turtles. Karai blamed her failure on the Foot Bots but insists that the Kraang are improving them. However, Shredder orders to avoid any deals with the Kraang until his return. Again, Karai disobeys and goes to the Kraang, who are building a robotic replica of Bradford's old human form. She then decides on a test run on April. Though the Kraang become startled, they permit the test. Karai eventually confronts April and Donnie with a squad of Foot Bots. While her robots distracted Donnie, Karai engaged April, bragging that her years of training make her superior, only to be struck in the head by April's tessen. Despite this, she is able to incapacitate April, only for Donnie to come to her defense and knock her down instead. Just then, Bradford arrives and seizes April, it disobeys Karai's orders to kill her as it obeys its Kraang programming to kidnap her for the Kraang. Karai stopped it from taking off with her rival, causing the robot to turn on her. When the other Turtles arrive on the scene, Leo assists April to use the smoke bomb to escape.

In "The Manhattan Project, Part 1", Leonardo genuinely tells her that Splinter is her real father, but she refuses to accept it and thought it was a lie. The Shredder returns from Japan with his new recruit Tiger Claw his new second-in-command. Karai got really upset because she earned that job of being second in command. She then made fun of Tiger Claw’s appearance. Splinter then tells Karai to treat Tiger Claw with the upmost respect and to follow his orders. She then assists Tiger Claw in capturing Splinter and bringing him to Shredder by using the Turtles as bait. With Splinter captured, chained and weakened by poison, Karai refuses to let Shredder slay him. She rather see Splinter die through a fight not when Splinter is chained. At the time she thought Splinter looked pathetic.

In "The Manhattan Project, Part 2", after the defeat of Tiger Claw, Raph then wonders where Karai is now. Meanwhile April still cannot believe that Karai an “evil witch” is Splinter's very daughter. Splinter states that one day Karai will accept the truth, but that is her decision to make alone. Little do they all know, Karai is hiding behind another billboard on the rooftops nearby, overhearing everything that they said. Based on her several facial expressions, Karai started to her reflect on what is going on. Not only Karai is in a difficult situation, but she finally starts to question herself, whether or not Shredder is telling the truth.

In "The Wrath of Tiger Claw", Karai was shown sadly looking at a photo of her mother (while having a flashback of Leo genuinely informing the truth). Karai is still confused and wants to understand what‘s going on. When The Shredder asked her what was bothering her she then told him she wanted the truth about her mother; Shredder then told her that Hamato Yoshi killed her. All is interrupted when Tiger Claw returns; Karai questions how he possibly could've survived, Tiger Claw explains how he escaped and all the battles he's been through and how he wants revenge on everyone who made him go through it. Shredder then tells him that he will grant his wish and orders Karai to go with him and destroy the turtles and Splinter, much to Karai's dismay. She is initially reluctant, but after Shredder pressures her, Karai obeys, but at the same time she wants to investigate first. While running through the rooftops and bantering she questions Tiger Claw on what his plan is. Tiger Claw then tells her that she is with him because she knows where the turtles hang out and who their friends are. They head off to Murakami's restaurant where they torture information out of him. Karai sees how scared he is and states that this is getting them nowhere and leaves while Tiger Claw trashes the place and gains information on the turtle's friends. They then go to the movie theater and find Casey, April and Irma there; April senses them and then they split up to separate them. Karai catches up with April, who prepares for a fight but Karai tells her she just wants to talk and tells her about her conflicted emotions: all her childhood she was raised believing that Shredder is her father while Splinter is the enemy, so when Leo told her the truth about Splinter, she couldn't believe it at first, and how the Shredder lied to her and that now she believes Splinter is her father. Karai is caught in the middle alright, but she isn’t actually sure if Splinter is her father. Karai is only there to investigate on whether or not she should still believe Shredder before making any judgement against the Turtles. Donatello and Leonardo arrive and she tells them the same. Karai tells Leo that she now believes him about Splinter. Once again, Leo has no idea that Karai is only there to investigate the truth before making any judgement. Overjoyed, Leo takes her to the lair to see Master Splinter, much to Raphael's dismay. Once there, Raph angrily argues with Leo and Donnie, remaining suspicious of her motives, suspecting that Karai might be leading Shredder to the lair. During the argument, Karai secretly tracks Tiger Claw just in case if the “truth“ is actually a trap. Splinter enters the room and stops the argument. Then he sees Karai or Miwa in his eyes, and he tells her to come with him as he has something to show her. Karai followed Splinter. When Karai saw the dojo, she becomes fascinated by the beautiful sight. He then shows her photographs of himself as a man, Tang Shen, and baby Miwa all together. Seeing this, she finally realizes the truth is real. She’s very upset on how many years the Shredder has been lying to She regretted tracking Tiger Claw. Thinking fast, Karai genuinely joins forces with the Turtles as they race out of the lair across the underground sewer tunnels to lead Tiger Claw away, but not before Splinter advises Karai to be who she chooses to be. As they are on the run, Karai doesn't know where to go since this all looks like a maze, but Michelangelo does. Mikey leads the team (who leads Tiger Claw) to a far-off meat processing factory where the Turtles brawl against Tiger Claw. However, he proves too strong for all of them despite their best efforts and then offers Karai the "honor" to kill Leo. She refuses to kill Leo. Instead Karai attacks Tiger Claw but is unfortunately bested and knocked out by him and taken hostage. Tiger Claw threatens to throw her in the grinder if the turtles step forward, so they keep their distance and he gets away with Karai. Leo suggests they go after them, but they have no choose but to return to the lair after Mikey is revealed to be badly injured. Furthermore, Raphael think Shredder still loves Karai. Meanwhile at Shredder's hideout Karai demands the truth from him and Shredder finally, yet bluntly admits that Splinter is her true father. He then has her jailed in a dungeon, now that she knew the truth about her parentage and true clan.

In "The Legend of the Kuro Kabuto", she is seen in her cell trying to escape by clawing at the door using a miniature weapon. Suddenly the Shredder enters and comes to the opposite side of the door. He then tries to explain why she is with him and that it would have been wrong for her to have been raised by “scum“ like Splinter as well as the fact that everything he did was for them, the Foot and their honor. He then states that one day, he hopes that she will comprehend him for all of this. After he leaves, she continues to claw at the cell door hoping to escape very soon.

In "Vengeance is Mine", Fishface is delivering a bowl of food to Karai, who is still in the Dungeon. Karai admits that she hates the food she's being served, but Fishface angrily commands her to eat whatever he brings. Karai quickly corrects that it was Tiger Claw who asked him to bring the food. Disgruntled, Fishface tells her to not speak to him in that manner and then departs. However, after he does so, it is revealed that Karai has finished dismantling one of the cell bars, so she is able to separate it from the cell door and use it to bust open the door. Karai then runs to the Dungeon exit and easily picks the lock, only to find Tiger Claw blocking her path forward. Karai attempts to attack him with the cell bar, but Tiger Claw merely grabs it and bends it until it is useless. Karai nearly succeeds in striking her foe, but Tiger Claw pins her down instead. The Shredder then appears and orders Tiger Claw to spare Karai. Tiger Claw agrees and, later, Karai awakens with chains around both of her arms, while Shredder is standing behind her. Shredder takes off the lower part of his mask and asks why Karai has persisted in trying to turn against him. Karai refuses to speak, causing Shredder to ask why his daughter is not responding. Karai tells him that she is not Shredder's daughter. After her daring rescue by the Turtles, Leo asks Karai if she is willing to stay with them for quite a while. With Shredder going after them all, Karai says that she has no other choice and confesses that their lair is pretty nice. When Splinter arrives and sees her, Karai then goes over and hugs him, which causes Splinter to believe that some things might indeed be worth the risk. After a training session between the turtles, she glances at the picture of herself as an infant and then asks Splinter about the details of his and Shredder's rivalry. Splinter explains that their rivalry was even deeper than what occurred with Karai's mother. He tells her that the Hamato Clan and the Foot Clan were battling for centuries upon centuries. Oroku Saki was just a young child during the Hamato Clan's final attack, so splinter's father decided to give Saki shelter, and Oroku soon met Hamato Yoshi (Splinter). After that, the two children grew up alongside each other as brothers, and they rivaled one another with their impressive Ninjitsu skills. However, this rivalry only grew bitter when the two of them met Tang Shen for the first time. Not long after this, however, Saki learned about the clan that he truly belonged to (the Foot Clan) and was enraged at Splinter for not telling him. Because of this, he invaded Splinter's household and tried to kill him, but accidentally killed the beautiful Tang Shen instead. He blamed Splinter for everything, so he burned their home down and took Miwa away and rejoined the Foot Clan. Karai then asks her father why he has never sought out revenge, only for Splinter to explain that revenge is the thing that will always lead to more pain - something that the Shredder does not realize. He then says that being reunited with Karai is far better than anything. He then pours his daughter a glass of tea to drink. Soon, the four brothers are preparing to go to bed, and Karai appears to be asleep already. However, Karai then wakes up so she can leave to the lair to take Shredder down. Leo waits for her by the subway tracks and informs her going to the Shredder alone is dangerous, but he believes they should face and defeat the Shredder, as he will never stop hunting them. Then Karai walks towards him and puts her hand on his shoulder, she mumbles that she's sorry and then throws a ball of blinding powder in his face. She then departs down the subway tunnel, claiming that 'this will end tonight'. Breaking back into Shredder's headquarters, Karai sets her sights on destroying Shredder, but he has been expecting her return and has a trap well prepared. At Baxter Stockman's lab, Stockman finishes mixing some DNA for a new batch of mutation, only to drop some unknown solution into it, when the Shredder arrives with the foot and Karai, explaining that she would be used as bait in order to capture the turtles and mutate them into snakes to use against Splinter. When Splinter and the turtles attack, Leo manages to reach Karai, only for Shredder to swipe at him, missing him and cutting the chain, watching helplessly as Karai falls into the mutagen. Karai is mutated into a three-headed white snake and wraps herself around Splinter, thinking him to be food, but is reminded that he is her father, which causes her to slither away, and they all escape before the building blows. At the end of the episode, it is revealed that she has the ability to transform into a slightly serpentine version of her human form, which is no doubt due to the unknown substance that Stockman accidentally dropped in the DNA before adding it to the mutation.

Karai makes three brief cameos in the season 2 finale, "The Invasion". In the episode's beginning, Shredder has flashbacks of key moments in her life, including her training and mutation. Then, she appears shortly as Casey and Raphael are looking for her. Then, at the very end of "the second part", she saves Splinter from drowning, she kisses him, before slipping away into the water.

In "Serpent Hunt", the turtles search for her while she is being hunted by Ivan Steranko and Anton Zeck as well as Fishface and Rahzar who try to capture her on Shredder's orders. The turtles manage to track her down to an abandoned factory where they get attacked by the Kraang who she easily takes out. They then try to talk to her, where Donnie realizes she is becoming more snake-like. She then transforms into a human, where it's revealed her human form looks more pale and scaly than it did after she got mutated, and informs them that it's to dangerous to go with them. Fishface and Rahzar show up and manage to capture her by stunning her with a taser. Ivan and Anton then capture her and attempt to make a deal with the Shredder by handing her over to him so he can help them escape the city that the Kraang have taken over and constantly patrol everywhere. The turtles then show up and free her while they fight the shredder. She then gives them a clue; pointing to the East and the word "comet" before she escapes by jumping into the water at the docks.

In "The Pig and The Rhino". The Turtles, Casey, and April discover three potential places that Karai could be hiding and split up to find her with retro mutagen in an attempt to change her back. Leonardo and Michelangelo discover she's been at Coney Island and her hint regards the Comet Roller Coaster. Karai evades them in the Haunted House attraction but they corner her outside, where she almost attacks Mikey but is stopped by Leonardo. He asks her if she can change forms but it appears that she can't. She runs away once the now mutated Steranko and Zeck show up (who Mikey calls Bebop and Rocksteady). When Bebop and Rocksteady fight over the retro mutagen she appears and spits acid in Rocksteady's face, causing him to drop the retro mutagen and crush it as she escapes into the haunted house with Bebop following her. This distraction allowed Leo to free his brothers, April, and Casey. After the turtles defeat Bebop and Rocksteady, Karai comes out and Leonardo sprays retro mutagen on her, but to their disappointment it has no effect, as Donatello says that Karai is a special kind of mutant. Leonardo offers to bring Karai home, but she thinks it's too dangerous as her mind is still deteriorating. As it turns out, she only brought the turtles to the location so she can say good bye to all of them as she once again escapes into the water. Later, in the streets, she tries hunting a nearby rat, but it was a trap set up by Bebop and Rocksteady, who take her to Shredder's lair. Shredder swears that he will cure her and they will have their revenge on the Turtles, as Karai angrily hisses at him.

In "Casey Jones VS. The Underworld", Karai is seen imprisoned behind a glass wall in Shredder's Lair, banging on the wall for escape, as Shredder once again promises they will reverse her mutation.

In "The Noxious Avenger", she is briefly seen in her cage in Stockman-Fly's lab.

In "Clash of the Mutanimals", she is seen imprisoned in Shredder's lair, where she overhears Shredder's plans to use the mind control serum on her.

In "The Deadly Venom", Stockman-Fly successfully restores her human form and infected her brain with a Mind Controlling Worm. Shredder then orders her to attack Rocksteady who she defeats easily. Shredder then orders to hunt and destroy the turtles and their allies. She first sends a bunch of venomous snakes to bite April and then she got the drop on Casey Jones. He gave her a good fight but by using both her ninja skills and her new control over her mutant powers she over powered him and gave him a poisonous kiss. When Mikey and Raph came to save him Karai's snake came out of Casey's clothes and bit them. She then used all four of them as bait for Leo and Donnie and she placed some of her venom in the water they swam in. With Leo poisoned she quickly got the upper hand but by using a healing technique Splinter recently taught him, Leo beats her venom and defeated her, but when he turned his back for a minute she was gone.

In "Tale of the Yokai", she is seen as in infant with her mother Tang Shen. Her mom leaves her unattended to go after Splinter and Shredder. After her mother's unfortunate death, she is stolen by the Shredder who renames her Karai.

In "Attack of the Mega Shredder!", she is seen briefly being attached to some kind of contraption as she's forced to endure multiple worm injections due to the fact that one single mind-worm is not enough to keep her under the Shredder's control (most likely from her fight with Leo involving the Healing Hands technique in "The Deadly Venom"). The Shredder apologizes to her and promises her that they will soon have their revenge on Splinter and the Turtles. Bebop and Rocksteady are then assigned by the Shredder to watch over her as well as secure the base from the turtles.

In "The Fourfold Trap", she sets up a trap for the Turtles with Shredder's other henchmen to lure Splinter to her. She lures Donnie first by having Stockman hack into his T-Phone and making him think April is calling him. After that, she captures Mikey by luring him to Murakami's and having him eat pizza gyozas spiked with a chemical to knock him out. Finally, she lures Leo, Raph and April when she fakes a phone call from Mikey. When they arrive, they are quickly overwhelmed by Karai and the other mutant henchmen. Karai has the turtles placed in separate rooms each filled with a different trap, while April is chained near Karai. April then has no choice but to call Splinter and warn him, where Karai takes her phone and finally talks to Splinter, who is surprised to hear his daughter after so long. Splinter arrives where the Turtles are kept, and he defeats each and every one of Shredder's henchmen until only Karai is left. He tries to reach his daughter and pleads for her to stop, even calling her Miwa, but she doesn't listen and attacks him. During the fight, he tells her that he loved her mother very much, but this only infuriates her. Splinter dodges all of Karai's attacks and knocks her weapon out of her hand. He then says that he won't fight her. She reverts to her mutant form and says that he doesn't have a choice before lunging at him. Splinter narrowly avoids getting hurt by her as he tries to dodge her attacks, until she dives into the water around the command center. Splinter then takes Leo's suggestion about the healing mantra and goes through the motions as Karai circles him in the water. Just as she tries to attack him, he finishes the hand motions and hits her several times in crucial areas with the mantra. He then tells her he loves her before pressing two fingers into her head. She spits venom in his eyes, and wraps around him. Just as she is about to finish him, she screeches in pain as the brain worm that's controlling her weakens, causing her to let go of him. She thrashes in pain and throws herself off the platform until Splinter grabs her by her wrist. Unfortunately, her wrist slips out of his hand and she falls into the water as it drains into the sewer, taking her with it, much to Splinter's sadness. At the end, she lands in a sewer pipe and changes back to her human form. The healing mantra that Splinter performed on her is shown to have worked as she pukes the brain worm out of her mouth, thus restoring her free will.

In "City at War", after being freed from the brain worm, Karai calls her old friend, Shinigami, from Japan to aid her in taking down Shredder's criminal empire. When Shinigami returns to Karai at Shredder's old headquarters with a tanto carrying the Hamato Clan insignia, they soon are confronted by April and the Turtles, as the tanto belonged to April. Karai explains that she's no longer their enemy now that she's free of the brain worm, and explains her plans to rebuild the Foot before Shredder's corruption, take down his criminal empire, then Shredder himself, once and for all. The Turtles offer their support, but Karai believes she needs to do this herself. However, she does allow April to face Shinigami again for getting her tanto back. Though Shinigami easily beats April, Karai agrees to return the tanto, before the Turtles and April then take their leave. Later, Karai and Shinigami arrive at a martial arts store that Karai knows is a front for Shredder as he keeps a cache of weapons in the back. They are soon attacked by Tiger Claw, Fishface, and Rahzar, and before surrendering after Tiger Claw takes Shinigami hostage, Karai sends a text message for help to the Turtles. After being subdued, Karai frees herself, but is soon overpowered by Tiger Claw, who prepares to kill her before the Turtles and April arrive to help after getting Karai's text message. As Karai and Leo fight Tiger Claw, at one point, Karai allows her mutant self to surface as she turns her arms into their mutant form to attack Tiger Claw with, but he is still able to overpower her before April incapacitates him with The Dragon's Tail, allowing Karai and Shinigami to escape with the Turtles and April, but not without leaving behind enough explosives to wipe out the weapons cache for Karai. Back at the Turtles' lair, Karai speaks to Splinter about what she's doing, and though he wants her to join the Turtles and work together with them, Karai explains that she's grown up now and needs to deal with Shredder in her own way. Splinter voices how proud she is of her as she departs with Shinigami to continue her plans with rebuilding the Foot and wiping out Shredder's empire, not realizing that she may have started a war with Shredder that's she's not going to win.

In "Broken Foot", Karai and Shinigami are aided by Leo behind Splinter's back as they continue to systematically take down Shredder's criminal empire, taking down Hun and his Purple Dragons before burning a temple full of Shredder's laundered money, then attacking Auman Chemicals, encountering resistance in the form of Foot-bots, Tiger Claw, Bebop, and Rocksteady, but managing to plant their explosives and damage the facility, aided by fresh Foot Ninja from Japan. However, Donnie was injured trying to save Mikey and Raph from the explosion, and as a result, Karai and Shini are forced to flee from Tiger Claw before he goes after the Turtles with Bebop and Rocksteady. When Leo arrives at Shredder's old lair with Mikey and Raph, Karai reveals her next target to be the Foot-bot manufacturing facility at Auman Chemicals. Destroying it would cripple Shredder's army beyond repair, but having witnessed what Karai's revenge did to Donnie, Leo wants nothing to do with it, leaving Karai to blind him and his brothers, while Shini uses her magic tricks to further disorient them so Karai can take Shini and the Foot Ninja to still take down the factory. However, their plan falls apart due to Tiger Claw, Bebop, and Rocksteady anticipating their arrival and having the factory crank out Elite Footbots, which manage to overpower Karai, Shini, and the Foot Ninja, capturing them. However, Leo, Raph, and Mikey arrive to save Karai and the others, but thanks to Raph fiddling with the control panel, the Turtles, Shini, and the Foot Ninja are sorely outnumbered by Elite Foot-bots, until Karai plants an explosive on the large cistern at the top of the factory and detonates it manually, burning the side of her face, but causing the cistern to plunge into the molten slag below, splashing it on the Elite Foot-bots and destroying all of them along with the factory. Leo retrieves Karai, and together with Mikey, Raph, the Foot Ninja, and Shinigami, they escape as the NYPD flood to the factory, now a raging inferno, regrouping in an alley where Karai uses her mutant abilities to heal her burn wounds similar to a snake shedding it's skin, much to the Turtles' amazement before they return to their sewer lair. Once there, while the Turtles are overjoyed to see Donnie fully healed thanks to Splinter's healing mantras, Karai apologizes to Splinter for having allowed her revenge to bring harm to others. She then decides that taking down Shredder's criminal empire is no longer her priority. As of now, she's going to go after the Shredder himself, turning to leave and drawing her tanto blade as she does.

In "The Insecta Trifecta", Karai has ordered to her Ninjas to look for Shredder, only for them to report negative results, angering her and assuming her half-mutant form as a result before ordering her Ninjas to leave. Right after that, she notices Stockman's Antrax servant invading the lair before Stockman himself and Scumbug arrive. She says of all the mutants Shredder would send to take her down, he just sends his only and useless bug, much to Baxter's infuriation, and manages to put a good fight against Stockman's minions before she is caught in a spider web. The Turtles and April arrive just in time to save her but the group is overpowered by Stocman and his minions' ability to fly and one more hallucination of Raphael's is enpugh for Karai to be taken along with Leonardo and April. She is seen trapped in a spider web along with Leo, April and Casey (who was captured as well before her) in a high-rise construction and worries if Stockman and his minions are going to eat them. She is rescued by Mikey, Donnie and Raph and teams up with April to defeat Stockman's minions before she kicks Stockman out of the controls of a crane. The team captures the mutated scientist's minions while he flies away back to his master's mansion

In "The Super Shredder", Karai is at her base when a blackout occurs. When Shinigami reports she has no idea how it happened, Karai suggests doubling the guards outside, only for Tiger Claw and Rahzar to enter. Karai is ready to fight them, when they reveal Shredder is with them, entering to reveal he's become what Karai says he hated the most: A mutant. Shredder manages to take out Shinigami, their Foot Ninja, and Karai, in her mutant form, before threatening to hunt down Shinigami if Karai does not surrender to him. Left with no choice, Karai surrenders, and watches as when the Turtles and April arrive in the Shellraiser to save her, Shredder easily overpowers the Shellraiser and sets it ablaze, much to Karai's horror.

Afterwards, Karai is taken to be held hostage in the area where Shredder and Splinter had their last battle that Shredder won. When Splinter arrives to save her, he is confronted by Shredder, and soon forced to retreat when he realizes he's no match for Shredder in his mutated state. As Splinter lures Shredder away, Karai frees herself and regroups with the Turtles and April, only to be stopped from pursuing Shredder and Splinter by Elite Footbots. By the time they reach Splinter and Shredder in the under-city where Splinter fought the Rat King, they are unable to help as more Elite Footbots block them from reaching Splinter, who manages to collapse the broken bridge segment he and Shredder are on, before dragging Shredder with him to their presumed deaths. As the Elite Footbots begin to rain arrows on them, Karai, April, and the Turtles are forced to retreat and regroup, knowing that Splinter might still be alive if he survived the fall. Before they can consider it further, the doors they were hiding behind are blown open, and they find themselves confronted by Bebop, Rocksteady, and at least a half-dozen Elite Footbots...

In "Darkest Plight", Karai encourages the team to take down Bebop, Rocksteady and the Elite FootBots for Splinter, but they retreat due to being severely outnumbered. April called Casey to help them search for Master Splinter. While Donnie, Mikey, Raph and Casey search in the abyss of the under-city, Karai, Leo and April are going to watch for Shredder and his goons. April senses Shredder and Tiger Claw's presence and Shredder orders his loyal bounty hunter to destroy April, bring Karai to him alive, and also Leonardo so Shredder could destroy him personally.

Tiger Claw follows the trio to a roof, knocks Leo off the roof into a street and almost kills April but Karai protects her fellow Kunoichi, leads the mutant tiger away from her and defeats him using her serpent form's tail to throw him into some power lines, electrocuting him knocking him out for a while. She and April save Leo just in time from being crushed to death in the hands of the Super Shredder. After Shredder is hit by a truck, he lifts it and throws it right to Karai, but she's saved by April, aided by her Soul Star crystal, which gives her the strength to throw telekinetically the truck right back at Shredder. But Shredder catches Leo and prepares to finish him off, only for Karai to beg him to do not do this as he could do something good for once in his life than wasting it with revenge. Shredder gets touched by this, but Karai was just using this to give Leo time to escape. Karai then screams at him, saying he was never her father, and punches him right in his mutated pulsing heart, which causes him to spill mutagen from his mouth and limp away, severely weakened. Karai prepares to finally kill him, but Tiger Claw arrives to rescues him. April asks her to forget Shredder as Leo needs medical attention. Karai agrees to this and helps April take Leo back to the lair.

In "Tale of Tiger Claw", after being cursed by the Cursed Blades of Vengeance, Casey briefly flashes back to the venomous kiss Karai gave him in "The Deadly Venom" She was briefly mentioned when Leo and Mikey are on patrol.

In "Requiem", with the old lair no longer safe, Karai and Shinigami are seen taking up residence with the Mighty Mutanimals in the Bronx, but their relief at being safe is short-lived as Super Shredder lays siege to the hideout and sets it on fire. As Karai faces him, Super Shredder taunts her at how she'll die just like her mother Tang Shen. Enraged by that, Karai charges Super Shredder, but thanks to his mutation being stabilized and strengthened, Karai's tanto blade shatters upon trying to stab his mutated heart, and Karai is knocked off the catwalk and buried under debris, left to die in the inferno. Leonardo and Splinter arrive and manage to pull Miwa out, but once outside, she's not responding. Leo performs CPR on her and manages to revive her, much to Shinigami's relief and gratitude. As the NYPD and FDNY are heard approaching, Shinigami stays behind with Karai so she can be taken to the hospital by the paramedics to be treated for her injuries.

In "Owari", Karai is in the hospital, having suffered numerous bruises, cuts, abrasions, and a broken arm, but is expected to make a full recovery. When the Turtles arrive to tell her about her father's death, she too was devastated. Hoping to avenge him, Karai gives them the location of Super Shredder's hideout so they can end things once and for all. Once Super Shredder has been eliminated, Karai joins the Turtles, April, and Casey on a rooftop overlooking the city, knowing that with Shredder gone, there will be a major power struggle to fill the gap, but they will be ready for it, knowing Splinter is watching over them from the afterlife with pride.

In "The Forgotten Swordsman", Karai and Shinigami follow their Foot Soldiers to a warehouse, where they confront her over her leadership as they believe she doesn't deserve to be the leader of the Foot Clan. Karai and Shinigami easily overpower all of their soldiers, only to encounter one more adversary different from the others. That opponent is none other than Karai's old mentor Hattori Tatsu but even reverting to her snake form isn't the enough to beat him but escapes with her life thanks to Shinigami and her dark magic tricks. She and Shinigami arrive to the Turtles' lair to ask them for their help against who is after the Kuro Kabuto to gain total leadership over the Foot Clan. Mikey and Raph arrive after a battle against Fishface and the revived Rahzar and she becomes extremely shocked upon hearing the Kabuto will be used to bring Shredder back from the dead. Shinigami explains that if they keep the helmet away from Tatsu's hands, the ninjas will side with Karai, their rightfull leader. Their only chance for survival is to take him down. They create a plan to get the Kabuto. Karai, Leo, Shinigami and Mikey'll turn off the lights and fight Tatsu while the others stay alert to Foot Soldiers.

Tatsu manages to best everyone present Tatsu but Karai manages to strike Tatsu's Oni mask revealing, to Leo's shock, he's totally blind. However, even though he was born blind, he possesses an extremely good sense of hearing, leading to people believe he had a sixth sense. He proceeds to explain his backstory of how the Shredder found his skills quite useful to the Foot Clan and became the "Blind Swordsman" before the other members mocked him. He also reveals how Karai attempted to eliminate him with her newly-recruited soldiers, shocking Leo once more. Karai admits her mistake but asks Tatsu to leave her family out of this but Tatsu refuses to hear any of her words and assures her she and her friends will suffer the same fate.

Tatsu takes Shini and Mikey out of the battle and Karai angrily mutates but is still no match against her old mentor. He prepares to finish with her life, only to fail when Casey throws his explosive pucks at him to prevent him from killing Karai. During another battle, Leo gets an idea: he attempts to disorient Tatsu by throwing at him Casey's pucks while Karai times her steps with each explosion but he manages to block Karai's sword attack but what he didn't know was that Leo jumped behind him and disables his hearing with a nerve move he used on Rapahel earlier. Karai sees this chance to defeat her old teacher with her mutant form and succeeds. Karai changes back to her human form, informs the soldiers they're being used by Tatsu just like Shredder and the Foot Clan deserves a noble and moral destiny before asking Tatsu to return to Japan and rot there. Tiger Claw, Rahzar and Kavaxas arrive to take the legendary helmet and the demodragon drains Tatsu's soul leaving him dead before, under Tiger Claw's orders, attempting to kill the Turtles but April creates a shield with her psychic powers to protect everyone present allowing Tiger Claw, Rahzar and Kavaxas to escape with the Kuro Kabuto. Casey and Shinigami are taken to hospital and Karai apologizes for foolishly going after Tatsu by herself but the team forgives her and they all promise to stop Kavaxas once and for all as a team.

In "Heart of Evil", Karai assists the turtles to find the next phase of Tiger Claw's plan to revive Shredder. She and April are on a motorcycle chasing Bebop however he then blasts them but April saves herself and Karai from falling. Karai, with the turtles watch over Don Vizioso's hotel and is waiting for Kavaxas and Tiger Claw to show up. Karai with her mutant form pins down Kavaxas to allow April get the Seal of the Ancients. Karai with the turtles are then defeated again by Kavaxas.

In "End Times", Karai and Leatherhead are called by Michaelangelo to help them defeat Undead Shredder and Kavaxas once and for all. Although Leo had told her to rest up, Karai sarcastically jokes about this to Leonardo. She and Leo are seen attacking the Undead Shredder and Kavaxas. Because Kavaxas' ulterior schemes had gone against Tiger Claw's plans, Tiger Claw sides with the Turtles. Eventually, alongside Tiger Claw. Karai and Leonardo watch as Kavaxas is sucked back to the Netherworld along with Shredder pushing him to the portal. Afterwards, with all of Manhattan restored to it's former glory, Karai and Leo embrace their father's spirit and emotionally watch his spirit take the skies once more, knowing that Splinter is still there with them, in spirit. As the team admires a very beautiful sunset, Leo decides that it's time to return home. However, Karai wraps her arm around Leo's shoulders and politely requests him to linger around, as she is fascinated by this scenery, willing to "enjoy and appreciate this moment...for a little while longer".

In "When Worlds Collide", Part 1 and Part 2, the conclusion that Raph's brothers all have girlfriends, Karai is shown playfully sparring with her love interest and younger adoptive brother Leonardo in the Dojo part of the Turtles' lair. As they exchange some witty banter, Karai charges at Leo, but in a non-life threatening and jocular manner, stating that although she likes him, she "won't go easy on him" (a possible reference to tough love). Later in the episode after Newtralizer has blown up Mikey she can be seen cuddling Leo's shoulder in condolence.

In the 4-part episode story arc Monsters and Mutants, during the episode "The Frankenstein Experiment", Karai briefly appears while Leonardo, who is trekking to Frankenstein's castle through a haunted forest, is suffering from horrific hallucinations of the Shredder (in all his forms) by The Pharaoh. She was summoned next to Undead Shredder because Leo is facing his fear of both Shredder and him taking Karai from him again. After Leo realized it was only a hallucination, Karai (as a vampire and snake-like form with the Super Shredder behind her, which gravely worried the Turtle leader) disappeared through a puff of dust. Because of this hallucination, it's implied that Karai may have also been bitten and turned into a vampire back in New York City, and unofficially restored when Mikey fatally stabbed Dracula.

In "The Foot Walks Again!", Karai appears for the last time, having become a fully-fledged heiress to the newly reshaped Foot Clan (which is now allies with the Turtles) with her right-hand Shinigami and some of their Foot Soldiers. They are patrolling the city from the rooftops, searching for Purple Dragons, but find that the city is at peace. They are about to call it a night when they spot Bebop and Rocksteady with some weird-looking robotic Foot Soldiers from the 1987-1996 TMNT realm, attacking a secret Earth Protection Force warehouse facility in search of a transmat microchip too pen up a portal to Dimension X. She alerts Leo and the Turtles, who then play a prank on her by confusing her with the 1987 Turtles. Surprised by this, she asks the Leo and Donnie what the heck she is seeing, then insults the alternate reality Turtles from their looks, much to 1987 Raphael’s annoyance replying “Nice to meet you too. With friends like these who needs enemies?”. Once Bebop and Rocksteady exited the base, she and the Turtles ambushed them but were also ambushed by the 1987 Foot Clan and Shredder. Karai gasps as she saw Shredder supposedly alive (but isn't aware that this Shredder comes from the 1987 TMNT world), who then orders the Foot to attack them. Karai's Foot Clan then saves her and the Turtles from the 1980s Foot Soldiers. While the 1987 Shredder began laughing and gloating, Karai angrily charges and attacks him with ease, possibly thinking that he was the Shredder from this current universe. Due to Shredder's cowardliness, arrogance, the fact that he tries so hard to look menacing, he really isn't. He refuses to fight a girl, he orders the Foot to destroy her while saying she is a little too tough.

After the 1987 Foot and Bebop and Rocksteady escaped Karai and the Turtles's wrath, she questioned the 8 Turtles how will they get the chip that will open a portal to Dimension X. Karai isn't present in the final battle (The Big Blow-Out), marking this episode the final appearance of her and her Foot Clan.

Appearance
As a human: Karai is Donatello's height (approximately) and is quite athletic. She has short, dark black hair with a large portion of it dyed blond in the back. She wears bright red eyeliner over the tips of her eyebrows, and often wears a distinctive black and silver armored ninja outfit. When she chose not to wear her ordinary outfit, however, she instead wore a brown biker jacket with metal studs all over it. She also wore blue jeans.

As a mutant: She is a snake armed white serpent with green eyes, snake heads that replace her hands, and armor that has become infused with her skin.

Personality
Unlike her previous incarnations, Karai is portrayed as a rebellious teenager. She always seems to enjoy having the freedom to make her own mistakes and cause trouble. Karai can be serious when needed to be and occasionally desires to know what is going on in her surroundings before making a move that she herself or her former clan could later regret. This can be noted numerous times, such as when she encountered the Kraang and decided to work briefly alongside the Turtles to slay several of the robots.

She has now discovered the truth about her real family and she has apparently "changed sides". 

Karai also seems to have a soft spot for people that have lost their mother, as seen in "Karai's Vendetta", where she hesitated to harm April when the latter leaked that she lost her own mother.

Even when she believed Shredder was her father, she didn’t want to harm anyone and had more honor and standards than he did. She had to do what Shredder said or there would be consenquences. She basically was Shredder's puppet, but she had no clue.

Karai/Miwa seemed to be strong, rebellious and fearless, but she is actually quite kind and compassionate, and likable.

After being turned into a mutant snake, Karai becomes feral and predatory, but retains enough of her personality to briefly recognize Splinter and not only call him "Father", but at Season 2's end, save him from drowning after he is thrown down the sewer by the Shredder. As a sign of their connection, she also managed to fight her instincts enough to not only recognize and call Leo by his name, but also beg him to help her. Despite this, Karai also feels that she is becoming dangerous and wants to stay away from the turtles. When under the influence of the brain worm, she reverted back to her old personality but she was worse than ever before because of her snake powers until she was freed from the brain worm in "The Fourfold Trap". She is now currently an ally of the turtles and their friends and wants to rebuild the Foot Clan into a more honorable one.

Abilities, Skills, Powers and Weaponry
Karai is still highly trained in high leveled moves in ninjutsu and hand-to-hand combat ever since she was a girl. Her weapons are a tanto knife (which symbolizes her higher rank as a full-fledged kunoichi of the Foot clan) and several shuriken. Her natural fighting skills make her incredibly agile in battle, even equal to Leonardo's high skill level.

Unlike her 2003 series counterpart, Karai eventually gets inadvertently mutated into a semi-mindless purple-and-white snake. However, due to a small addition of human DNA included, she is able to transform back to her human form for short periods, retaining snake fangs, prehensile tongue, serpent eyes and extended serpentine arms. Her face even had scaly parts and her eyes had remained a greenish color instead of their normal brown. Her snake form grants her several abilities attributed to her type of snake; such as further increasing her hearing, speed, agility, endurance, stealth and flexibility to superhuman levels, even giving her greater eyesight and night vision. However as the violent convulsions during her transformation suggests, the transformation itself actually is a very painful affair.

In addition, Karai can infect her victims with extremely lethal poisons and highly toxic venom that is quite fatal in a matter of hours, capable of seeping through skin in seconds. They have no antidote but can be counteracted with the ancient healing arts of "the healing hands" mantras. When recaptured, Stockman Fly had used his scientific intellect to give her complete control over snake form, allowing her to appear fully human without any noticeable snake traits, and even turn full snake at will. When used in conjunction with her highly extensive ninjutsu skills, her snake abilities makes her quite a formidable opponent. Some time later, she learned how to use her snakelike abilities to heal severe injuries she has sustained (such as burns or bruises) by simply shedding her damaged skin and replacing it with brand-new skin, similar to how a snake sheds its skin. As a snake, Karai can also hypnotize her opponents with her stare.

As a human, her skills as a kunoichi are so great that she can take on Leonardo one-on-one or all four turtles at once. As seen in "Enemy of My Enemy", her primary weapon choice is a wakizashi (a short yet sharp Japanese blade).

As a mutant serpent she has incredibly fast reflexes, an amazingly strong tail that can be used for whipping, constricting and crushing, and she can spit blinding venom.

She is also shown to be able to morph between her human and mutant form. As the mutagen Shredder set up was designed to turn the victim into a mindless snake, Karai does struggle to keep her human mind in tact compared to other mutants. Donatello notes that Karai is a special type of mutant, as normal retro mutagen doesn't seem to turn her back to normal.

Ninjitsu: Her skills as a Kunoichi are very formidable, as she is easily able to take on Leonardo one-on-one or all four of the turtles at once, which can be seen in Enemy of My Enemy. Her primary weapon of choice is a Wakizashi, which is a Japanese blade shorter than a Katana but longer than a Tanto.

Acrobatics: Though she being human showed some strength against her enemies. Having great acrobatics to compare to an athlete person.

Snake Form
Venom Spit: She also have the power to spit blinding venom whenever she is angered. She can also use her tongue in a pitch fork like action.

Retractable Teeth: It's also shown that her sharp teeth are retractable.

Second Mouth: In the back of her head, there is actually a second mouth. When she shows it, her metal scalp and the area under that will split apart. This second mouth has a snake tongue and teeth, just like her actual mouth. However, it is never shown to have four main fangs in the front like the latter. It is unknown if she can use this to eat/drink or use vocal cords, but this mouth has tremendous grip strength as she bit down on a Kraangdroid's arm with it then ripped the arm free just by pulling.

Enhanced Strength: She has incredibly fast reflexes, an amazingly strong tail that can be used for whipping, constricting or a able to smothering.

Aquatic: Like most snakes she can swim for long periods of time as she was traveling to another location from the West Side of New York.

Weaponry: Her weaponry is notably sharp teeth and long tail.

Metamorphosis: She is also shown to be able to morph between her human and mutant form but even as a "human", a few of her snake features can still be noticed. In "The Fourfold Trap", it's revealed that she can actually revert to her human form that she had before she was mutated that has no serpentine characteristics.

Intelligence and Communication: She shown to have her intelligence as human but loses a bit of it from becoming more bestial mentally while in mutant form. She can still hiss while talking, but that has some difficulties. Though her mind is fixed by "The Deadly Venom."

Healing Power: She also has the ability to heal her skin wounds (such as severe burns and penetrating wounds), she just has to shred her skin to her mutant form and when it goes back to human, the wounds completely disappear. She can transform a certain part of her body into mutant form at her own will.

Longevity: She possesses an extended lifespan and slowed aging because she is a mutant with healing ability.