Board Thread:General Discussion/@comment-27907368-20160514064034/@comment-27620479-20160517041941

Thaswordster wrote: You see Asgore on the intro cutscene when you open the game. We see a monster, who looks like Asgore. It could be his ancestor, just as he has a son, with similar, goatlike features. I don't remember it is specified anywhere that Asgore was in the war.

Also, "they will return". Keyword being RETURN. It means that whoever the prophecy speaks of, they are not with us anymore. Asriel died and saw the surface. Also, they "will descend from above", as told by Gerson, who was in the war, and who is the only one you can ask about the Delta Rune. Which means, the angel should come from an upward direction, and that only seems possible through the hole where Chara fell. But Chara only comes back on a genocide route, which would contradict "will bring us freedom".

Unless we include reincarnation. As far as I know, Chara confirms on the genocide route, that in the game's world it is possible. Since reincarnation is the return of the soul in a new body, Frisk can be Chara's reincarnation (as they both have the same soul color, and probably even shared memories). Of course, by that logic, both of them, and any of the other six humans could be the reincarnation of the unknown gender human in the intro.

So, I think it remains speculation.