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Nightmare fuel
I know he isn't that scary, but Gaster's been haunting my nightmares since 2015.
Gaster by HotHotLegg April 11, 2020
It's a secret!
But no seriously, Gaster is a secret character from the game UNDERTALE. Said to be Sans and Papyrus' dad. Well, it's not confirmed, but he may be. He speaks in WingDings too.
Undertale Fan: I FOUND THE SECRET GASTER!!!
gaster by SkyBerry June 5, 2016

Gasterflasted 

I'm gasterflasted of whats going on .

Michael Jackson didn't understand he could not touch kids. HE WAS GASTERFLASTED!

gaster blaster

Sans' guns pew pew pew pew pew pew pew
Sans: I'm gonna freaking kill you.
Frisk: But saaans...
Sans: WITH A GASTER BLASTER!!!
Frisk: ded
The skeleton of a dragon.
When a dragon is killed it becomes a gaster.
Gaster by Desipida February 13, 2020

WingDing Gaster 

WD Gaster (named after the fonts WINGDINGS and Aster) is a secret character in the RPG UNDERTALE by Toby Fox

Nobody knows much about Gaster, we don't even know what he really looks like, but we know that in the game he was the former royal scientist of the underground

abilities: unknown

Possible appearance: a possibility of what DR Gaster looks like is a goopy noseless Skeleton with a crack going up his right eye and another going down his left eye, he wears a black lab coat and a white sweater, and appears to either have a big hole in both his hands or his hands are closed/ in a fist

it is widely believed that Gaster is the father of sans and papyrus ( the skelebros named after the fonts comic sans and papyrus)
another belief is Gaster created the skelebros by cutting a hole in each of his hands and using what he cut out to clone himself (creating sans and papyrus)
another belief is after Gaster was shattered across space and time he was split into 2 beings therefor meaning sans and papyrus could be 2 halves of Gaster

nobody knows how or why Gaster was erased from his timeline and shattered across space and time

some believe he fell into the core (a giant power converter that converts lava into power that Gaster created)

some say he was pushed in

some say he was sucked into a black hole during one of his many experiments.
ENTRY NUMBER SEVENTEEN
DARK
DARKER
YET DARKER
THE DARKNESS KEEPS GROWING
THE SHADOWS CUTTING DEEPER
PHOTON READINGS NEGATIVE
THIS NEXT EXPERIMENT
SEEMS
VERY
VERY
INTERESTING
...
WHAT DO YOU TWO THINK

- WINGDING Gaster
WingDing Gaster by comicsans92 September 15, 2017