Board Thread:Questions and Answers/@comment-31067473-20170714200704/@comment-27136653-20170809145327

I have already explained everything with my first comment. They gave up on life because Asgore was too strong for them, or some were simply kind and willingly gave their soul away.

And there is no doubt that for everyone except Frisk, death meant that their soul perseveres. But that was a final death. We know that Frisk came back every single time, so maybe the same happened with those humans. I know the logic here may sound totally backwards, but nothing is contradicting it. If the soul breaks, it means it's resetting the timeline. If it doesn't, it means it's giving up, moving on.

I first disliked this thought too, but I kept coming back to it, since it's the only logical explanation. I mean, how else do you explain Toriel remembering the other humans in such way? She said that she felt like she already knew them when they came to the underground. That can be only explained with the reset ability. After all, many monsters, including Undyne, Papyrus, Alphys and (maybe) Mettaton experience the same when we reset after meeting them. So all this and Toriel is most likely a direct hint at the fact that the other kids did possess the ability to reset.