Board Thread:General Discussion/@comment-26459934-20160808161403/@comment-28898329-20160814141303

Frisk can't really be said Angel for a simple reason: the prohpecy says that the angel "will return". This implies that this being has already been in the Underground, but Frisk never "returns" and only falls by accident (emphasis on accident), so that's not really plausbile.

What makes sesne is Chara being the evil angel. They have seen the surface and returned, and they end up destroying the world.