Gaster Stories

1.2K Stories

(Sans x Reader) When Two Souls Meet by ZanaBSparrows
#1
(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...
Completed
I'm...swap gaster? by KarmaAkabane425
#2
I'm...swap gaster?by Karma Akabane
Yeah sorry gained an idea on if someone became swap Gaster Also they may be apathetic or just confused on their feelings and MAYBE Autistic, I may be a bit wrong on ap...
Dragon of Destruction by LunarFlower693
#3
Dragon of Destructionby LunarFlower693
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...
Light in the Dark (Gaster X Reader) by SpiritWolfNura
#4
Light in the Dark (Gaster X Reader)by Kyran Wolfe
He went blind in a freak accident at the lab. Now all he 'sees' is darkness. Until.. he meets you.
Completed
2 Sans and a Papyrus (Undertale story) by SpiritWolfNura
#5
2 Sans and a Papyrus (Undertale st...by Kyran Wolfe
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...
Completed
Hiding in Sight (Sans and Papyrus GB Story) by SpiritWolfNura
#6
Hiding in Sight (Sans and Papyrus...by Kyran Wolfe
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...
Completed
Derivations of L.O.V.E. by Aliciamyre
#7
Derivations of L.O.V.E.by Phosphell
In this world, when Error leaped off the edge, he took Ink with him. (Cover art and any story art is mine)
More than friends (Female Chara x reader) by Friskybits13
#8
More than friends (Female Chara x...by Cringe
Yes there will be mistakes >:3
Completed
Kindness 《Undertale》[Completed] by Maela_Bow
#9
Kindness 《Undertale》[Completed]by Mae~Chan
It had been less than a day after your best friend Chara, had gone missing. You were already really worried about her (Chara is Female in this) The others didn't look so...
Completed
Gaster AU x Reader ONESHOTS by EmilySkelewolf
#10
Gaster AU x Reader ONESHOTSby Lady of WIP
Let's get this over with... HIGHEST RANKING: #35 in Fanfiction June, 23, 2017 ALL IMAGES USED ARE NOT MINE! Cover was made by Bunnymuse on her Tumbler (I think). Bunnym...
Child of the Void (Gaster! Reader x RWBY x Highschool DXD) by KyogreKing120
#11
Child of the Void (Gaster! Reader...by KyogreKing120
A/n: I got some inspiration from another story, I'll try not to make it a carbon copy. Gremory Rose, to be exact. The forgotten child. The Cursed One. Such cruel names t...
Gaster x Reader- Not Your Fault by Singeroftales
#12
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...
Completed
DustX [Underverse Fanfiction] by DuckQuackWhatever
#13
DustX [Underverse Fanfiction]by Quack Quack
He wakes up in a white place... (Man wakes up as a alternate version of Cross Sans,neat,the cover is mine..Cross Sans is not mine or any Sans you will see besides this a...
Gaster AU Oneshots 2 by EmilySkelewolf
#14
Gaster AU Oneshots 2by Lady of WIP
Here we go! All images shown are not mine. Cover is by Bunnymuse. Highest Rank: 48 in Fan fiction
Loved (  Underlust Sans x Reader  ) by Astarisk_Night
#15
Loved ( Underlust Sans x Reader )by Astarisk_Night
(Y/N) is a 24-year-old girl that just finished college. She learnt everything the hard way since she lost her parents at a young age. She wasn't interested in love and f...
YOU'RE GONNA HAVE A BAD TIME! by PixlMess21
#16
YOU'RE GONNA HAVE A BAD TIME!by TrueBornLeak
It's been a year since YN Gaster joined Union Academy. And it's been eight months since he suddenly vanished. In the four months he was there, he'd been beaten within...
Reborn as a baby Xtale Gaster by Cosmicstars08
#17
Reborn as a baby Xtale Gasterby Cosmicstars08
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...
Abandoned male Reader Gaster X Ruby Rose X Blake Belladonna by Al1enF0x
#18
Abandoned male Reader Gaster X Rub...by 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...
Undertale Sister Scenarios by EmilySkelewolf
#19
Undertale Sister Scenariosby Lady of WIP
"Like Underfell, but a different AU."
Undertale: giving soul by Author-Dayo
#20
Undertale: giving soulby Author-Dayo
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...