Talk:Frisk/@comment-29894983-20160916225634/@comment-24821641-20160918022124

They don't fully control Frisk, mostly seems like it's only them when you move in cutscenes. Whether Chara's talking to the player or Frisk at the end is unknown, but they do take Frisk's soul.

Chara says "You are a great partner", so yeah, I think we can assume they're partners. Also evidenced by how some narration in Genocide uses 'you' instead of I despite Chara definitely narrating in at least that route.

I'm pretty certain they woke up when Frisk fell and are there regardless of what route you play, but that's up to interpretation.