Gasterblastersans Stories

The barrier has been broken for a few years now. Monsters and humans have been living in peace together . . . for the most part. There are rumors about a monster who...

Mostly just pictures and some comics on Gaster Blaster Sans transforming or being a Blaster beast already. I do not own any artwork or au's shown in this book. Hope you...

Basically what it says in the description... Just some pictures of Feraltale and BB Trust Au. Also some other pictures such as Temmie, Doomfanger, and The Annoying Dog...

Dr. Gaster made 1-S and 2-P to break the barrier and start a war. When he disappeared, they were scared, confused, alone. They broke out of their prison and Grillby rais...

[[UNDERTALE SPOILERS!!]] After frisk had done the pacifist run many times, something gone wrong... Flowey never showed up in the end. So frisk lived in the underground w...

Most of you probably already saw these in my art book, but I really wanted to digitalize these, as well as write stories to go with them. :3 Highest Rankings: # 11 in go...

(UNDER REWRITING!!) this is my first x reader so please be nice you are a werewolf like your pack but you cant change into a wolf fome you have the same strength stamin...

The barrier is finally broken, and at last all of monsterkind are free to walk on the surface. Again. Sans the Skeleton is skeptical. Why bother getting excited for some...

UNDERTALE SPOILERS! it had been a long time since a human had fallen down. They only needed one more human so they could be free from the underground. Sans were talking...

Status: OPEN Since I am working on a back story for Gaster Blaster Sans, I decided to open a little Ask thing. I'm also working on an X Reader: https://www.wattpad.com/s...

Ok, so I did this book on quotev and now I'm moving it to here. There will be no author notes any of that (unless I really need to). So this is one of my first story's s...

Your a kid about 15 going to be 16 soon Monsters lived in the surface for one year They go to school jobs and so on like humans But there a legend that there is one b...

This is a GasterBlaster!Underswap!Sans fic in the world of Underswap. Sans (or Blueberry) is a ten-year-old skeleton who isn't allowed to leave home. While his father (G...

After the barrier shattered, Sans started to display rather strange behaviors and physical changes. No one could understand why this had started to happen over the years...

What is wrong with Sans, and who is Gaster? This is such a reused Description. Undertale belongs to Toby Fox.

Intro: The barrier was down. It had already been four week. Most of the humans were not pleased with the monster arrival, but since Mont Ebbot was a bit far from the c...

many years after the war between humans and monsters, humans lived peacfully without the threat of soul absorbing monsters, however the peace lasted only a short while a...

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This is a story about pain, trust, struggle and bonding. It follows the characters of Toby Fox's game UNDERTALE. It also introduces new characters. There is a new prop...