izuku: this whole current battle arc has kind of been about people telling him that killing his foe is the only way and izuku just being like...no I'm going to try and get in touch with his sad inner child first. so it's inconclusive right now but I'm leaning on no. it would take a lot of circumstances falling into place for him to purposely kill someone.
tifa: has definitely wanted to kill someone before. had even tried (and failed) to act on it. but overall she would rather keep casualties to a minimum. she carries a lot of guilt for the people, even Shinra soldiers, who have gotten hurt or killed just from being in the wrong place at the wrong time.