Karai [2012]

Miwa has black hair that's lighter at the back. She wears several black earrings and red eyeliner on her upper eyelids. She has amber eyes. She wears a jumpsuit with silver armor, a black material worn under her armor, traditional Japanese shoes, and a purple belt.

In her horned viper form, Karai has white skin and green eyes. She has no hair. Instead of hands, she has snake heads. In addition to her main mouth, she has another mouth at the back of her head, the purpose of which is unknown. She wears only armor. It's unknown how she changes her appearance, and how she manages to keep her clothes on.

Before the "Enemy of My Enemy" episode, Karai was more calm and even offered the turtles a temporary alliance. But when they broke the pact, Karai became more cruel, more ruthless, and wanted to kill Splinter and the turtles at any cost, just like Shredder. Karai was also quite inhumane; for example, she wanted to kill the innocent April in revenge for her mother's death. She also treated those below her in rank, such as Xever and Bradford, with no respect.

Everything changed when she found out that Splinter was her real father, Karai became kinder, but she still remained vengeful and wanted to take revenge on Shredder herself, which ultimately led to her mutation.

Originally the daughter of Tang Sheng and Hamato Yoshi, Shredder stole Karai when he killed her mother and set fire to her house. For the past 15 years, Splinter believed she was dead. Karai believed Shredder was her real father, and Splinter was an enemy, like the Ninja Turtles, training under Shredder as a kunoichi.