Gaster Stories

Everyone is finally on the surface. Humans and monsters have made peace. Harmony has finally been reached. No issues or problems with anyone exist anymore... Right? Well...

What if our favorite knuklehead ninja goes to Undertale multiverse, become a monster, and has gamer system? This is my first story.

uty is dying so why do some deltarune stuff(Note I do NOT ship spamvil)

I decided to do an ask & dare with my AU, Staintale. Staintale is a AU where Frisk and Chara are controlled by the player, Chara, Frisk, Flowey, and Sans all remember re...

𝚃𝚑𝚒𝚜 𝚋𝚘𝚘𝚔 𝚠𝚒𝚕𝚕 𝚋𝚎 𝚏𝚒𝚕𝚕𝚎𝚍 𝚠𝚒𝚝𝚑 𝚐𝚕𝚒𝚝𝚌𝚑𝚝𝚊𝚕𝚎, 𝚄𝚗𝚍𝚎𝚛𝚝𝚊𝚕𝚎, 𝚗𝚎𝚟𝚎𝚛𝚝𝚊𝚕𝚎 𝚌𝚑𝚊𝚛𝚊𝚌𝚝𝚎𝚛𝚜, 𝚠𝚒𝚝𝚑 𝚋𝚒𝚝 𝚜𝚙𝚘𝚒𝚕𝚎𝚛𝚜...

??? was a fan of undertale heavily but when she suddenly got hit with a truck (because everyone dies from trucks when they get isekaied.)she was expecting to be dead so...

A mysterious skeleton that judges of the sins of others. A mysterious demon that kills to entertain himself. A mysterious Yokai that works on all sorts of sides. What ha...

Having escaped their cruel imprisonment within Mount Ebott, monsters have settled on the surface for six years now. Their human savior, Frisk, now struggles with the bus...

this is a fic I promised a few months ago you might be wondering why now? to be honest I forget 💀 but now I can start ( I found a paper about working on it and that's w...

What if the war never happened? What if Sans never went to the monsters? What if Gaster never went to the skeletons? Sans has it good! Everybody knows everybody in in h...

Y/N was just your normal every day monster in the underground, well. That's what he thought at least before meeting the human. Join Y/N in his adventure with the human i...

The royal scientist. A person of great mind and high respect. An individual that could never possibly make a mistake. But what happens when an obsession with human souls...

Ask me and my characters questions!!!!! Also, yes, I DID create Rust

⚠️ Warning ⚠️: This is not accurate to either fandoms, contains violence and swearing. If this triggers you then do not read this book although swears have been censored...

Sans has had an interesting past. A past that even his beloved brother barely even knows of. A past that, despite being so long ago, always finds a way to bite back. A p...

Goats n' more goats Altertale by Friisans - http://friisans.tumblr.com Cover Image by klaroja96 Most art by Friisans or LifeOfCynch Other artists may be included Disclai...

After Chara decides to humor Frisk, things don't go entirely as planned.

I take no credit for anything in my book. All rights are reserved to the original creaters of undertale. I also take no credit for the art work in my book. All credit g...

A few years had went by since you made your home in the Underground. You had started a family, started a life. You had a kid and a job at the Arcade. But finally, Chara...

Sans has had an interesting past. A past that even his beloved brother barely even knows of. A past that he wishes could remain a secret. But when the questions start be...