Gasterblasters Stories

In a world where heroes rise and darkness lurks, a unique girl named Sans finds herself thrust into the vibrant halls of U.A. Academy. With a mysterious past and the pow...

After Frisk "fell" into the core, they became core!Frisk. While being stuck down there, Core!Frisk is determine to escape and after finding new friends inside...

YN Sans grew up wanting to be a hero. With the help of his best friends Frisk and Izuku, he aims to go to UA and accomplish that goal. Sans Male OC x Frisk

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...

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

Everyone thought all the monsters were sealed Underground, but upon making it to the Surface, a couple monsters nobody has ever seen before starts to make an appearance.

Ink had a.. how do you word it? 'Odd' ? That's a good word, he had an odd dream. After waking up, since that day he's been having even more odd dreams. The Star Sans, In...

First Draft The Player has taken over Frisk and is wreaking havoc Underground over and over and over. Sans has broken from the carnage and sacrificed himself to let Papy...

⚠️Read first chapter for rules when requesting!⚠️ (requests will NOT be open again in the future) -*_This book is discontinued (Please don't read it, it's so bad.) _*- •...

[[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...

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...

Y/N is an Ultima but she is also a soul mix. A soul mix is when two soul types combine and become one being. She is a mix of CHAOS and CORRUPTION. The strongest soul typ...

Warning: this contains vore. If you don't like vore then please leave. Those who stayed, enjoy. Running through snow. "Help me!" " Fear" "It hur...

W.D. Gaster never meant to fall in love during the war. But he did. It resulted in heartbreak, a pup, and a high LV. So he experimented. 10 years and no more kid. So he...

Have you ever wondered that out of the thousands of humans during the human and monster war that not even one sympathized with the monsters? I bet you do, for I certainl...

(DISCONTINUED. GO TO THE ACTUAL AO3 WEBSITE TO READ OTHER CHAPTERS) https://archiveofourown.org/works/5350673 It's over. Frisk's journey has ended in the best way possi...

Fgod Error, his little sis(Pixel), Null, and Void end up in vampireverse. Now this is pretty typical, the twist though, is that they are gaster blaster shifters! They ca...

Frisk has spent 8 years in the underground, during 4 of these long years her friendship with Sans grew to be something more, resulting in a beautiful relationship. Trage...

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...

Erin was a gaster blaster who was made by dr Gaster for his son Sans. After a few years Sans had grown up and had left the lab taking Erin with him, he had other gaster...