Board Thread:General Discussion/@comment-26006155-20160613103837/@comment-26006155-20160617170239

Isthereaplace wrote: I don't say Gaster. Gaster is highly speculative, and is usually the "wild card" for anything that needs it.

Well, here's EVERYTHING WE KNOW ABOUT GASTER:

Gaster was a human. The follower that says "I'm holding a piece of him, right here" is holding a talking human head.

Gaster designed the Core, and fell into it, becoming scattered across time and space.

Gaster is now a Ghost, when you encounter his secret room Frisk can pass right through him, something that doesn't work for any other NPC, and then Gaster gives a start and fades away when you try to interact with him.

W. D. Gaster is named after the Wing Dings font, which he speaks in, making him the third member of The Font Brigade, along with Sans and Papyrus.

Sans and Papyrus clearly knew Gaster at some point, Sans (and likely Papyrus too, if the Annoying Dog hadn't stolen his) packs Gaster Blasters as weapons. During his "Darker Darkest" secret 17th True Lab recording, Gaster asks "What do you two think?"

Gaster, not Alphys, was the one who invented the Determination Extraction Machine. Alphys found a set of blueprints and built the machine using them, she didn't DESIGN it. Gaster was experimenting with Determination long before Alphys did.

Gaster's 17th True Lab message talks about an incredible dark experiment he's conducting. This puts it right between Message 16 "No No NONONO!" and Message 18 "The Flower's Gone." Considering that Flowey didn't show immediate signs of animation after getting multiple shots of Determination, this may actually mean that Gaster had a hand in Flowey's creation.

An alternative interpretation of Message 17 is that it coinincides with Alphy's datamined hidden Message 17, where she talks about the Fallen Down monsters all melting together to form the Amalgamates. Which could mean that Gaster had a hand in the creation of the Amalgamates, and if my theory about Gaster creating the Fallen Down monsters by stealing their souls is correct, this pans out, Gaster DID have an indirect hand in creating the Amalgamates.

In Toby's Earthbound Halloween Hack, just before reaching the fight with the fallen Doctor Andonuts, you see a pixelart face that's clearly an altered version of the Uboa easter egg face, made to look more masculine. And it also contains Gaster's telltale up and down eyeslashes.

Gaster, in some capacity, is still active even in Frisk's time. The boat pilot warns Frisk "Beware the man who speaks in hands."

Muffet the spider queen tells Frisk that someone who could shapeshift offered her money in exchange for collecting Frisk's soul for them. If the Amalgamates all reside in the True Lab, this means a Ghost wants Frisk's soul.