I spent almost 14 hours on this and I didn't even shade it ;A; Why must I be so slow? I didn't even try to make the type look good. Wingdings is annoying to work with XD

Anyways:

SPOILERS? (sort of?)

So I love every character in Undertale, I want to draw a page for every one of them, so keep an eye out for that. I decided to start with Gaster for no reason other than that I like his face. I guess my headcannon is that he's just as sweet and goofy as all the other Undertale characters. I feel like he's really lonely and sad that he's been forgotten by people whom he really cared about.
I don't necessarily think he's related to Sans and Papyrus, but I think he at least knew them and was close to them. I'm thinking he and Sans were the science nerds and Papyrus ended up babysitting them when they got too distracted by their work.

It's not very well thought out. I'm not huge into the theory stuff.

Gasters Dialogue:

"THIS NEXT EXPERIMENT COULD PROVE TO BE VERY INTERESTING."

"EVERYONE...HAS.......FORGOTTEN....SANS....PAPYRUS.....WHY DID...THIS.....HAPPEN?"

"PAPYRUS! I'M WORKING WITH DANGEROUS CHEMICALS HERE....."