Board Thread:General Discussion/@comment-32783587-20180302162510/@comment-34645353-20180311182346

Why would he say "Beware the man who speaks in hands." Beware? If this is Gaster (which it most likely is since the ex-royal scientist speaks in Wing Dings, which many of which are hand symbols) wouldn't he already be dead before Flowey became Flowey? I doubt Gaster would've done anything to Asriel, either.

Anyway, this theory isn't very likely. You say you have this evidence, but a random monster we have not seen can just as well fit the evidence you have.

Also something that else: River Person says they should have worn a few more pants and Flowey can't wear pants, so...

I did have my own theory that the River Person is one of the fallen humans that lingered after death and died because of Gaster, which explains why they say beware of the man who speaks in hands. They would know where Temmie Village is, spiders' favorite food, Asgore's favorite food, the piano room puzzle, and stuff like that because that fallen human discovered it. Of course, some mysteries still remain with this theory. How would the fallen child be able to linger after death? I'm not saying this is a perfecy theory, but it does have some evidence at least.