Karai

Karai is an enemy of the Ninja Turtles. As a skilled Kunoichi in Ninjutsu, she is loyal to the Foot Clan and Shredder. She also leads the Foot Soldiers in missions and attacks all around New York City. Karai debuts in Teenage Mutant Ninja Turtles.

Teenage Mutant Ninja Turtles
She attempts to draw out the Turtles in the subway but is subsequently knocked into a wall. Karai assists the Shredder and Eric Sacks various times in the film and her final appearance is the during the battle on the mountains, when she is rammed into by Raphael, causing her jeep to flip and smash into a tree.

Teenage Mutant Ninja Turtles: Out Of The Shadows
She returns in the sequel, once again as the Shredder's right-hand woman. She assists him throughout the film, acting as his assistant and bodyguard of sorts. She also works closely with the Shredder's other accomplice Baxter Stockman. After Shredder betrays Stockman, he leaves Karai to guard to the shield. April and Vernshow up and fight with Karai until April finally knocks her out.

Behind the Scenes
Noji confirmed that her character appeared twice in the film's first trailer (released in March 2014),[1] and that Karai is an enemy of the Turtles.[2] Noji, who said she "knew the character backwards and forwards"[3] and described it as her "dream come true," also said she enjoyed the role because she has "always been magnetized to women who are strong women warriors — not necessarily physically, but as a spirit, as a soul, with inner strength."[4][5] Noji said the casting was "unique in that, because the project was so confidential, none of the actors were given the name of character or the sides ahead of time. However, since I’m a fan of the franchise, I was able to piece things together and quickly knew it was for the role of Karai. I was elated."[6]

It was reported there was a filmed but unused scene of a fight between April O'Neil, Vern Fenwick, Karai, and The Foot in downtown Manhattan that was cut from the finished film. Will Arnett, who played Vernon, said his character "comes out just at the right moment [and] hits Karai with the gurney and knocks her off balance a little bit. Then April kind of finishes her off."[7][8]

Appearance
In the 2014 film, Karai has black hair with red streaks, wears a gray scarf, black pants, shoes, shirt, and finger less gloves.

In the 2016 film, Karai has black hair,

Trivia

 * This is the first live-action appearance of the character.