Gaster Stories

Error didn't know what to expect after being pushed into the Void. He didn't expect to be transformed into a teenager. He didn't expect to fall into a world full of drag...

Image a world where there was no war. Toriel and Asgore never divorced. Gaster never fell into the void. The genocides never happened. Everyone is happy. That is this wo...

--- > In a world where only women are born with quirks, society treats men like they're worthless. Izuku Midoriya is bullied by his sister, ignored by his mother, and...

Well, here we are again, huh? I guess want to know what the Undertale crew talks about when nobody is looking. Ok, then! Come on in! Let's get all up in their biiiiiiiiz...

At the end of every genocide run, Frisk duels with Sans and wins. However, what if Sans begins to care once more and takes the blow in replacement of Papyrus? Who will l...

I do now ship this.. maybe? idk The sans aus have been trying to find classic.. (for some apparent reason) he is the most powerful sans. and the only hope to defeat to v...

What happens when the Gaster Gang handle a human child situation? Read and find out! Based from Bun-bunmuse art story. ps. the reader is 5 year old girl ?

The reader wakes up to a new life as a monster skeleton. In a new world, that's filled with monsters, humans, and magic. But instead of living their new life to the full...

A series of semi-realistic scenarios including a handful of Undertale characters. In otherwords, stick around. ... Please.

I don't really know, just an attempt. Might go well, might not. We'll see.

The one that made it the furthest in the underground, perseverance. Perseverance had beaten almost all of the monsters in the underground from papyrus to sans and undyne...

(Pics in this story does not belong to me) (Frisk is a girl in this story) After a long journey, Frisk saves all monsters, her friends, and as well Asriel. frisk beco...

"Do you not want to go back home? To the surface?" °°°°°°°°°°°°°°°° "No." °°°°°°°°°°°°°°°° "Why?" °°°°°°°°°°°°°°°° "Because my home i...

This doesn't 100% follow the original Xtale story even before the babifacation of Gaster. When a pure yet genius soul dies at the same moment one of Xtale Gaster's over...

When Weiss Schnee Gets Hit by Cinder Falls Fall Maiden power she falls into the abyys and ends up in the anti void instead of The Ever After where she meets Error!San's...

I walked along the street. Everything was perfectly normal. The sun was warm, a soft breeze swept through my short (h/c) hair. Then the sound of glass shattering reache...

What if Sans only got Papyrus away from Gaster? What would happen if Alphys found him trapped years later? Can they teach him to be a normal monster, or will he forever...

This is a story before the last human fell around the time Chara was still alive and well. Humans were not being hunted till the adopted prince's passing, however with a...

Harry Potter was master of death, he was use to ending in other universes/timelines. This time he ended up as a skeleton monster Remake of Death and wingdings om ao3 201...

They say that hero's come in all shapes and sizes. Well now we have someone who's here to prove that.