Board Thread:Fun and Games/@comment-34938155-20180308175500/@comment-33409434-20181117222644

Well, you could either be right, or wrong. According to the River Person, he says 'beware the man who speaks in hands', right? That may or may not be just a legend he heard somewhere from one of the Gaster-followers, or, I could be totally wrong, and he does know about Gaster himself. Although he speaks of this Gaster, he may just know that it's a man who speaks in hands, not Gaster whose the one speaking in hands. He may know about Gaster though, and isn't repeating this phrase from some legend, since the River Person does speak in some sort of riddles. He also may be just hiding his monochromatic appearance (that all these Gaster-followers have) by his hood as well, especially since his hood is a basic dark hue.

I could also be wrong. In the early sketches of the River Person in the Undertale Art Book shows the River Person with a pink hood with flowers beside him, similar to the type of flower Flowey is. Maybe this version of the River Person was supposed to be Asriel in hiding, before they sketched out Flowey's actual form. When they sketched out Flowey's new form, maybe they left in the River Person just because Toby Fox thought'd be a good idea to leave him in for the sake of easier transportation?

The River Person may not be any sort of decoded message at all, he may just be a character who merely speaks in rhymes and riddles to imitate other captains or members of a ship's crew who typically also speak of rumors of the sea to intimidate or scare others.

Anyway, I hope this makes you thinking! Otherwise, great theory!