Karai is the daughter of Shredder and the 2nd in command of the foot.
After being abondoned by her parents, she was taken in by shredder, who taught her the ways of the ninja. After Shredder's apparent death in the TCRI Building, Karai came to New York to bring peace to the Foot. The Foot Continued to battle the Turtles for years until the Foot signed a treaty with the turtles. Afterward, Karai left New York and has not been seen since.