Gaster Stories

1.2K Stories

Light in the Dark (Gaster X Reader) by SpiritWolfNura
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.
The Ghost Above Me (Gaster x Reader) by xsfolia
The Ghost Above Me (Gaster x everail
Even though the Underground is now empty, except for some people, you still stupidly managed to fall in the once prison for monsters. Who knew you would get away from th...
The Void Hero| Gaster x My hero academia  by Lost_Naito
The Void Hero| Gaster x My hero Lost Naito
Gaster, the Royal Scientist created best of his invention. Core of Hotland. But there was an accident that ended his life. As a result of the crash at launch, he fell di...
Soul of a Weapon by SpiritWolfNura
Soul of a Weaponby Kyran Wolfe
What if Sans only got Papyrus away from Gaster? What would happen if Alphys found him trapped years later? Can they teach him to be a normal monster, or will he forever...
The Fallen Player by Treekami
The Fallen Playerby Tree
We follow YOU, the Player, on this epic Undertale story. You get sucked into the game on your computer and have no idea what to expect. Will you be able to get back home...
Undertale: giving soul by Author-Dayo
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...
Darkness' Eternal Bride (Gaster x Reader) by xsfolia
Darkness' Eternal Bride (Gaster everail
WARNING: THIS CONTAINS HIGHLY MATURE CONTENT (BLOOD, VIOLENCE) READ AT YOUR OWN RISK Money can change a lot of things. It can even change your destiny. Plunge yourself i...
~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...
Undertale Sister Scenarios by EmilySkelewolf
Undertale Sister Scenariosby Lady of WIP
"Like Underfell, but a different AU."
Soulmate (Underswap Sans x Reader) by 3amRambling
Soulmate (Underswap Sans x Reader)by 3amRambling
When you fell in love with the short, starry-eyed skeleton, you never realized just how far you would go for him. Through monsters, humans, resets, and genocide - you wo...
Undertale: The Third Sibling by Musicalhorse01
Undertale: The Third Siblingby Calli the Skeleton
It was just a peaceful day in Snowdin. Everyone was just doing what they normally do in the underground. The Nicecream guy kept selling, monster kid was playing around...
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 ?
We Speak In Hands (Gaster x Female!Reader) by OreoDaSkeleton
We Speak In Hands (Gaster x Oreo (>w<)✨
Gaster is the current royal scientist, set with a mission to break the barrier and free monster-kind from their underground prison. His loyalty and persistence to the ta...
Undertale:Secrets by ImSansational_
Undertale:Secretsby Sans
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...
Reincarnated as Izuku Midoriya's quirk {Undertale x Mha} by Azura_Dremmur
Reincarnated as Izuku Midoriya's Azura_Dremmur
I got reincarnated as izuku's quirk.. This is great I can be finally able to be in mha.. But why are the monsters in undertale starting to appear?!.. It won't matter I'...
Hiding in Sight (Sans and Papyrus GB Story) by SpiritWolfNura
Hiding in Sight (Sans and 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...
Characters in a Story (Sans X Reader) by MyLittlestLife
Characters in a Story (Sans X .
You are a fairly normal shut-in college student. That is until an all too familiar face brings monsters onto the surface. . . . #4 Sans X Reader (July 30th 2022)
Rising Storm [ Ink!Sans x Reader ] by morrow-
Rising Storm [ Ink!Sans x Reader ]by space sloth
free·dom (ˈfrēdəm) noun the power or right to act, speak, or think as one wants without hindrance or restraint. Freedom. It's a luxury that few can afford, not after the...
To the Bone by GhostFang12
To the Boneby GhostFang
It had been six months since Jaune Arc dissappered from the face of Remnant. It has been four years since Monster Kind had been freed from the Underground. On Remnant 7...