First an enemy, Oyuki Mashimi became a close friend of April O'Neil and the Teenage Mutant Ninja Turtles. She appears in the Archie Comics. In issue #28 of Teenage Mutant Ninja Turtles Adventures, the turtles are in an airplane flying to Hiroshima to rescue their friends Chu Hsi and Fu Sheng from someone called Chien Khan, who we later learn is a mutant dog (but we don’t know that yet because he wears a mask). Fu Sheng is an alchemist of some sort and Chu was a fireman who Fu Sheng gave the ability to turn into a Warrior Dragon. Chien Khan kidnapped them to use the Warrior Dragon in order to bring a demon to Earth. That is where Oyuki came in.