Mistress

The Mistress is a character first appearing in Tales of the TMNT vol. 2, #22, "Change of Power". A kunoichi who usurped Goseico from the Turtles' friend Gosei Hattori, she has ambiguous connections to The Shredder and claims that Hamato Yoshi wronged her family.

The Mistress' creator, Ross May, has revealed in his weblog that his intention was for The Mistress to be Oroku Saki's consort, and more importantly, Tang Amaya, the sister of Tang Shen. Misguided by Saki, she believed that Hamato Yoshi was the malicious one in the Yoshi/Tang/Nagi relationship, and that he was responsible for her sister's death.