PsychoIncarnate
The Eternal Will of the Swarm
I dunno, it kind of has more evidence than every other Undertale theory out thereGood god, MatPat has hit an entirely new level of stupidity with this one. This is a pretty massive stretch.
The biggest gap here is that Frisk recognized Sans in the photo. Frankly, Sans looks NOTHING like Ness, so I can't see how Frisk would look at Ness and think "Wow, look at that totally-a-skeleton!"
Which doens't really have any evidence at all except assuming Sans has something to do with Gastor because of Wingdings and Gastor Blaster. Not even what he has to do with him