Board Thread:General Discussion/@comment-26456251-20160824191731/@comment-27701762-20160824192840

Moons-A-Glow Werecat wrote: Except the entire point of this event is that Chara says that every choice that led to the conclusion was not them, but "you" (whether "you" is the player or Frisk). If we were playing as Chara possessing Frisk, then all of the choices would indeed be Chara's. The dialogue makes no sense.
 * Chara un-possesses Frisk in the genocide route and talks to them. I think that's when you're playing as Frisk.

*You get messages in the genocide run, like "It's me, Chara." and "Where are the knives." That's proof Chara's possessing Frisk, anyway. The mirrors say "It's you," and "Despite everything, it's still just you" when you're on a Neutral/TP route. It may be proof that Chara is possessing Frisk, but it only occurs on the Genocide route.