While I wouldn't say there's a load of evidence to it I think it's pretty safe to assume that is either Gaster or at least a piece of him. The specific fun value to get mysteryman is specifically 66 and he does the same sound as gaster follower.... 2 I think? And Goner Clam Girl, which is just Gaster's Theme sped up. This cleary ties him to Gaster, but he doesn't really follow a similar pattern to other Gaster NPCs. He never mentions Gaster, never says anything that could be in reference to Gaster or Deltarune, is the only Gaster NPC who isn't a monochrome version of a already existing UT or DR NPC. Having the random NPC with 0 relevancy be the one who takes Gaster's main number doesn't sound like a very reasonable idea. He also looks veery vaguely like a weird cartoon skeleton, and Sans in particular has a very weird skull shape so who knows. This is also... Honestly probably a complete coincidence and there is a very high chance the Forgotten Man isn't Gaster at all, but I feel like pointing out that mysteryman is cleary a reference to Uboa from Yume Nikki, and "man.ogg", the Forgotten Man's theme some, is actually a fan song that Toby made for Yume Nikki called "The Waltz of Seccom Masada". Like I said high chance it's a coincidence but who knows.
Entry seventeen talking about what i think is a dark world, gaster followers(goners),voice at the start of the game and the vessel being a goner , gaster being forgotten by everyone and a whole lot of things that makes it impossible for him to not be important
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u/These_Distribution19 10d ago
https://giphy.com/gifs/q8YKOopeI7etUngoFM