Gaster Stories

1.2K Stories

The Ghost Above Me (Gaster x Reader) by xsfolia
#1
The Ghost Above Me (Gaster x Reade...by 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...
Completed
Killing the Mood by ZeroTVoid
#2
Killing the Moodby Zero Time Void
Reincarnated as Killer Sans but a bit different. First getting reborn and then thrown into a trap AU. Too bed the MC is a genius. (Pun intantional) How that works while...
To the Bone by GhostFang12
#3
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...
Completed
The Faults in Our Souls ~ Gaster x Reader (Under editing) by _T3chn0_
#4
The Faults in Our Souls ~ Gaster x...by _T3chn0_
"Do you not want to go back home? To the surface?" °°°°°°°°°°°°°°°° "No." °°°°°°°°°°°°°°°° "Why?" °°°°°°°°°°°°°°°° "Because my home i...
The Fallen Player by Treekami
#5
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...
♡𝐷𝑒𝑣𝑜𝑡𝑒𝑑♡ (Delta Rune: Kris x Reader) by fufuvie
#6
♡𝐷𝑒𝑣𝑜𝑡𝑒𝑑♡ (Delta Rune: Kris...by ༻♡︎𝑪𝒉𝒂𝒐𝒕𝒊𝒄♡︎༺
He was deserted. Abandoned. Neglected. Disowned. Forlorned. She was compassionate. Affectionate. Solicitous. Warmhearted. Fonding. He was empty. She was fulfilling. She...
I'm...swap gaster? by KarmaAkabane425
#7
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...
The Comedian Skeleton In SDM (Last Breath Sans X Touhou) by AslancanTr
#8
The Comedian Skeleton In SDM (Last...by Aslancan Tr
This Story is taking place after the phase 3 event of Sans, finally losing against the human. Sans wakes up in a mansion and meeting with a blonde yellow with ponytail h...
18TH STAR CONSTELLATION: [ ̶H̶]ATE/BLACK SOUL [FOUR] by Anon_Author-420
#9
18TH STAR CONSTELLATION: [ ̶H̶]ATE...by Anon_Author-420
================================================================================== [Description]: A guy named Cep lives in a crappy house, and his parents are not exactl...
Connected to the Different  [ Glitchtale Fanfiction ] by Adamervinp
#10
Connected to the Different [ Glit...by Kono Matsura
When Dr. W.D. Gaster fell into his creation, he couldn't use his powers inside the void. What if it wasn't lost, but given to someone else? Meet Lukas Reeves, a normal...
Handplates Gaster x Subject 3! Clever! Tween! Reader by EmilySkelewolf
#11
Handplates Gaster x Subject 3! Cle...by Lady of WIP
Here ya go pplz. Tween: Short for Tweenager: 8-14 years old (I know, weird)
Abandoned male Reader Gaster X Ruby Rose X Blake Belladonna by Al1enF0x
#12
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...
Living With Little Gasters by Melody-Sapphire
#13
Living With Little Gastersby Melody-Sapphire
The Gasters have lived in the void for too long, they come up with a spell they believe will send them all back to their homes, or at least a universe less.....empty per...
Submersion. by pixelyman
#14
Submersion.by pixelyman
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...
Light in the Dark (Gaster X Reader) by SpiritWolfNura
#15
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
Reset {UNDERTALE} by emotistic-optimistic
#16
Reset {UNDERTALE}by Emotistic Optimistic
*FEATURED STORY* As Judge for King Asgore Dreemurr, Sans has seen a lot of strange stuff. But when he wakes up with the feeling that something is completely wrong, he de...
Completed
Christmas Party Au Comics (traduccion) by AnonimaVienKhul
#17
Christmas Party Au Comics (traducc...by AnonimaVienKhul
Haré la traducción de esta serie de cómics que me gustaron bastante de los mundos alternos de sans y papyrus(y Gaster) en una fiesta de navidad xD Disfruten! (?) Psst, n...
Undertale Reacts by NapstablookDiary
#18
Undertale Reactsby NapstablookDiary
Undertale gang reacts to songs, animations, comics, and more.
Child of the Void (Gaster! Reader x RWBY x Highschool DXD) by KyogreKing120
#19
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...
(Sans x Reader) When Two Souls Meet by ZanaBSparrows
#20
(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