A Personal Interpretation of Himiko Toga (So Far)

Himiko Toga:

Because of her Quirk, she liked to hide herself and exist as someone else. That was also why she liked people covered in wounds and blood. Moreover, because of a persecution complex (suspected, not yet confirmed), she always wanted to stab others. When she took a liking to someone, she wanted even more to obtain their blood, kill them, and use her Quirk to become them. Perhaps she thought this would help her understand them better (when people have something in common, they come to understand each other, and that common ground can be a hobby, good food, an experience, or the same appearance).

Lines from the original work (selection):

"I think it's too hard to survive (because anyone might want to hurt me or kill me, and there's no way to know whether, while smiling at you, they're plotting behind your back to murder you (perhaps because her Quirk is transformation, she understands better how people can be different on the inside from how they appear on the outside; not yet confirmed)). I want this world to become easier to survive in (so I want to kill anyone who might hurt or even kill me before they can, and I hope people can understand one another). I want to become Lord Stain (she wants to use her Quirk to turn herself into Lord Stain and thereby understand him better). I want to kill Lord Stain (she wants to know what Lord Stain's blood looks like, what he looks like covered in wounds and even drained of blood, and, after killing him, she wants to use her Quirk to become Lord Stain completely and take his place. She wants to become Stain through and through (because no two people in the world can be exactly alike, only one of the Stain she becomes using her Quirk and the real Stain can exist))."

PS2: This chapter represents only my personal interpretation so far. Please do not take it as canon.