Originally called "Judgment" in the first game, Yasha is the Babyface alter-ego of Benikage. Though given the fact that the female ninja is a Heel in name only, it would be more accurate to think of Yasha as the 'true' version of Benikage- the person she really is deep down once free of her former masters.

Yasha's behaves and carries herself like some kind of supernatural entity (as evidenced in how she dresses and acts). It's as if the implication is that she's the 'reincarnation' of Benikage,