Board Thread:General Discussion/@comment-38557913-20190331150706/@comment-32182236-20190426113209

Wow... Cutscenes to "prove" that Frisk is nice, and cutscenes to "prove" that Chara is evil...

I pretty much have a cutscene be Frisk.. As long as it would make sense. And given this reasoning, I don't think Chara takes control at all until LV19, with their creepy face towards Flowey. (Evil actions that belong to Frisk:Refusing to go behind the lamp, walking over Papyrus' puzzles, feeling good about punching the dummy, approaching Monster Kid to kill them...)

I do think Chara killed Sans, but not because it's automatic:Instead, it's because that doesn't add to the kill count, and because you didn't get a "You Won!" indicator. You didn't win. Chara did.

Since at that point, Chara's control has already been established, I'd also say that Chara killed Asgore and Flowey.