Talk:Player/@comment-79.150.179.77-20151026222750

The player is essentially cast as Chara. You just don't entirely realize it yourself, probably in a similar way Flowey doesn't quite remember being Asriel.

Every message addresed to the player character is also Chara talking to Frisk, as those are your "lines" to read within the game. Even the "It's you!" on the mirror is Chara speaking.

What drives Chara to play a pacifist ending? Same reason you could, at any time, reset everything.