Where's it from: Teenage Mutant Ninja Turtles (Mirage Studios, 1992)
In the Turtles comics, Shredder was missing/presumed dead. This left a power vacuum in the Foot Clan's leadership, and a young, beautiful woman named Karai came over from Japan to sort things out. We quickly learned that Karai was no damsel in distress—in fighting prowess, she was Leonardo's equal. Since her comic book debut, Karai has become an extremely popular character, serving as the sometimes villain, sometimes uneasy ally of our fearsome foursome.