Gaster Stories

1.2K Stories

Royal Blue by dealialestina
Royal Blueby Spilled-my-coffee
Sans knows a lot about secrets; he hides many. But when old burdens emerge from the darkness, secrets, new and old, put his brother in danger; and what else can a good b...
Hold Still GXReader by EternalKimFlame
Hold Still GXReaderby GalaxyChild
(Y/n) has had a rough life, how could it get any worse? Let's let G answer that. ~~ This is a Complete Rewrite of Hold Still! I don't own any of the pictures or Songs.
Eccedentesiast by dealialestina
Eccedentesiastby Spilled-my-coffee
Eccedentesiast Noun Someone who hides behind a fake smile, when all they want to do is hide and/or die. (Cover art is not mine, Undertale is Toby Fox's, please don...
Abandoned male Reader Gaster X Ruby Rose X Blake Belladonna by Al1enF0x
Abandoned male Reader Gaster X Mystery Fox
A Small child named Y/N L/N was born into this world with holes in his hands and because of this was abandoned long ago. for years he wandered the thick wilderness of pa...
Handplates Gaster x Subject 3! Clever! Tween! Reader by EmilySkelewolf
Handplates Gaster x Subject 3! Lady of WIP
Here ya go pplz. Tween: Short for Tweenager: 8-14 years old (I know, weird)
~Experiment~ {Yandere Gaster X Reader} by YinnyGuardian
~Experiment~ {Yandere Gaster X Yinny Guardian
None of the art used in this story belong to me!!! And neither does Gaster! __________________________________________________ You were just supposed to be another shot...
Gaster x Reader- Not Your Fault by Singeroftales
Gaster x Reader- Not Your Faultby Singeroftales
You're a human who has fallen down into the underground. There you meet a certain skeletal scientist and his sons. Will you get close to the family or will you become th...
AU Gaster's x Reader by SamoanaGirl101
AU Gaster's x Readerby Ruler of the Sea
Just a bit of the Gaster AU's that has ONESHOTS and......LEMONS. Kill me now.
Six feet under. (SLOW UPDATES DUE TO SCHOOL) by FanficMqker
Six feet under. (SLOW UPDATES Just another fanfic maker
I'll cut to the chase: Not all men are created equal. I learnt this at a very young age. 80% of the world has some sort of amazing superpower, while the other 20% are...
Unique Love (Sans x reader) by ArtCookie-_-
Unique Love (Sans x reader)by Art_Cookie~
Monsters were known as a myth to humans. It was told in an old myth book; one with a rare soul, could save all. One foolish human falls down, destined to save a populati...
(Sans x Reader) When Two Souls Meet by ZanaBSparrows
(Sans x Reader) When Two Souls Meetby Zana B Sparrows
Sans has lived through countless timelines. He's seen the kid make friends with everyone, only to give up in the final moments. He's seen the kid killed, over and over a...
De-Termination: Chara X male reader (Completed) by Xuatiel
De-Termination: Chara X male Xuatiel
Sometimes timelines can have storage 'anomalies', albeit a very low chance, but it is possible! The anomalies can do many things, such as allowing certain things to be c...
Divided [ Sans X Reader ] by morrow-
Divided [ Sans X Reader ]by space sloth
Almost four years marking the anniversary of monster kind reaching the surface, the human ambassador Frisk goes missing. Severing the link between the two species, an al...
Altertale AU Comics  by LilTerrificTori
Altertale AU Comics by #GoatsMatter
Goats n' more goats Altertale by Friisans - Cover Image by klaroja96 Most art by Friisans or LifeOfCynch Other artists may be included Disclai...
Something Hidden Female chara x male reader by shyboi69
Something Hidden Female chara x DaveRulez
i made this in class becuz i was bored updates are going up on either maybe on wensday or thursday if i feel like it weekends not the first weekend of each month im stil...
Welcome to Underhigh. Underhigh x reader (Completed) by Kath1908
Welcome to Underhigh. Underhigh Kath Wortman
WARNING: STORY HAS VIOLENCE (Y/N) is a young 17 year old who goes to Underhigh, the biggest high in the multiverse. (Y/N) had no friends and a bad past. She's smart thou...
Gaster gang x child reader  by Niharafroon
Gaster gang x child reader by Niharafroon
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 ?
Undertale.D (male reader insert) by Zark12587
Undertale.D (male reader insert)by Zayko/Zark
y/n found himself in a strange transition between the real world and undertale
Somethings Changed by Moonstone_Ccino
Somethings Changedby Moonstone_Ccino
Nightmare already has a hard life in the village. from all the bullying, to things being thrown at him, to people trying to steal the golden apples from the tree that ho...