1 - 20 of 294 Works in W. D. Gaster & Sans
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The human was not gonna back down nor fight, and Sans, if possible, wanted to avoid a violent escalation of the situation as well. Because, despite the souls’ best efforts, his body had not yet recovered from his escape. Every single one of his bones ached, and he was almost certain that the cracks that already covered a majority of his skull had expanded.
However, the stalemate didn’t last long because, as it seemed, the human had an ace up their sleeve. The outline of a black soul manifested on their chest and, soon after, a bright red button with ‘RESET’ written on it appeared in front of them. Sans barely had the time to notice Killer’s eyes go wide and wonder why that was before the human pressed it.
Sans stumbled onto a snowy path with no grace, alone and lost in an unfamiliar frosted forest. Snowflakes slammed harshly against his bones. They looked so delicate and yet he could swear they left a thousand tiny cuts on him. It was torturous… and yet familiar.
That was the power of a human. No. That was the power of an anomaly.
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or, Fresh out of the Void Color stumbles upon Something New. And, in his attempt to help, he perhaps bites off a bit more than he can chew
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Sometimes Sans wonders why he even does this job. Then he remembers.
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Beautiful Times by CaptainExtremis
Fandoms: Undertale (Video Game), Deltarune (Video Game)
04 Dec 2025
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A look into the time after the Barrier between worlds was broken, told in separate but connected vignettes.
Or:
The story of three humans, the monsters they knew, and how they worked toward a common goal without realizing it.I fought all through the night, oh, oh, but I made it alive.
The sun's starting to rise, oh, oh, these are beautiful times.
This fight of my life is so hard, so hard, so hard...
But I'm gonna survive.
Oh, oh, these are beautiful times.Series
- Part 2 of Crazy Mirror AU
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History of DUSTSHIFT by DUSTSHIFT
Fandoms: Undertale (Video Game), Storyshift (Undertale AU), Dustshift (Storyshift Take)
19 Nov 2025
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A three-part supplementary work detailing a summary of the history, world, and events leading up to the primary narrative of Dustshift, a Storyshift Genocide Route take, starting from the very distant past before the war broke and led to the Monsters' sealing inside of Mt. Ebott, to the present with Chara.
Series
- Part 2 of DUSTSHIFT - The Works
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autonomy autocracy//kiss me kill me//i love you by Squiped_Mew
Fandoms: Undertale (Video Game), Underverse - Fandom
09 Nov 2025
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Cross hates reverence. It’s a dirty, foul thing in his mind - reverence is what led to his universe’s destruction. Reverence for power, perfection, for something no mortal would ever be able to touch. Gaster - well, XGaster as he’s known in the Multiverse, a stupid name for a stupid man - wanted to become a god, to touch the golden pedestal that Ink stands on. That got him killed, and it’ll get Cross killed too, if he keeps this up.
But he wants it. That power, that freedom - he wants the chain off his neck.
He wants what Ink has.
He wants everything Ink is.
He wants-
(Or: Reverence, envy, and the strange intersection between the two.)
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A Jaded Emerald by KTamao205
Fandoms: Harry Potter - J. K. Rowling, Undertale (Video Game)
06 Nov 2025
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Abandoned on Mt. Ebott at the tender age of five, young Harry's unsurprisingly died, but Death's always had a weird relationship with his variant... Meanwhile, before Flowey's revival as souless talking flower, Sans makes a discovery under the mound of snow, Papyrus has always wanted to be a big brother anyways.
*Edited Summary (29/09/2025)
Series
- Part 1 of MultiTaleVerse
- Part 1 of Arcalith
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After Frisk manages to bring W.D Gaster to the Surface, he, Sans and Papyrus are able to continue living as a family.
However, W.D Gaster begins to realise just what his children endured during his 17 year disappearance.Content Warning: Discussion about past trauma, child abuse, underage prostitution, aphobia, coersion, child abandonment, homelessness and child sexual abuse.
Series
- Part 5 of random angst
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Sunny After Not Surviving by grudreader
Fandoms: Undertale (Video Game), OMORI (Video Game)
30 Oct 2025
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After telling the truth, Sunny is left abandoned by everyone including his only remaining family. Truly alone, he deems his life over before it had even begun and climbs a nearby mountain in hopes to never return. Fate has other plans, however.
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The Place In Which Flowers Grow [ Teaser thing ] by YourLocalHyperfixater
Fandoms: Undertale (Video Game)
24 Oct 2025
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Series
- Part 1 of BloomTale — Original Undertale AU
- Part 2 of Undertale/Undertale AU oneshots :>
- Language:
- English
- Words:
- 480
- Chapters:
- 1/1
- Kudos:
- 3
- Hits:
- 59
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Summary
Papyrus has always been one of the few characters that Flowey never fully understood
Even now that everyone is finally free, Flowey remains curious...Are there any skeletons inside his closet?
OF COURSE NOT! Just Papyrus sometimes.Or...
Papyrus WAS Gaster
The main story is set in the past, years before the events of Undertale, and it will explain what exactly led Gaster to shatter across time and space and how Papyrus came to be!
It will also fluctuate to the present in a post-pacifist timeline where Papyrus is figuring some stuff out.Series
- Part 1 of Forgettable-AU
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Disoriented and emotionally frayed from decades spent in the void, W.D Gaster suddenly finds himself at the mercy of a cold and arrogant alternate self. His doppelganger promises to return him to the void once his research is complete but before he can make good on his threat, Gaster is introduced to this world’s variant of his son and he is forced to make a quick, spur of the moment decision.
This sole act sends unforeseen ripples throughout the Multiverse and hurdles Gaster on a perilous journey across it to find his way home.
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Dadster plays hopscotch across the multiverse, unintentionally and intentionally acquires children, tentatively reciprocates Grillby's feelings, engages in actual literal custody battles with copies of himself, somehow steals a Bad Sans™, narrowly avoids death at the hands of Error and somehow flies under Ink’s radar for a shocking amount of time.
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Après l'accident, Cross doit réapprendre à vivre malgré la perte de sa jambe. Il tente de fuir son passé, mais tombe nez-à-nez avec Killer, son ancien amant.
☆
Petit cadeau pour l'incroyable Lazyfire <3
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(Human/College AU) Sans’ relationship with his father was…complicated, to say the least. They both loved each other, Sans knew that—hell, his small family would do anything for one another.
But sometimes Gaster just didn’t understand.
Sans was the firstborn, the eldest, the one Papyrus would turn to when Gaster was busy with one thing or another. Which was often. Gaster was a genius; of course he was working 24/7.
Maybe Sans just wanted some time alone to figure himself out, too.
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Adults lied. It was what they did.
They said they would take care of you, but they didn’t. They said they would be there, but then they died. Sans had gotten used to it.
But Papyrus shouldn't have to.
And if Sans had to take matters into his own hands in order to make sure he kept his promise to his little brother? Then so be it. It was Sans and Papyrus against the world, and some gangly skeleton with gentle sockets and a weird font wasn’t going to be the one to change that.
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“Sans, wait—! Please, let’s just talk for a moment—!”
“no way, you creep! leave me alone!”
“Excuse me? I’m not a creep! I just wish to talk! You have many people very worried about you—”
“nah, you’re not excused. gimme 500 g and then i’ll consider it.”
Series
- Part 1 of Finding Home
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A tale of Determination, Justice, Bravery, Patience, Integrity, Kindness, Perseverance, And LOVE. by Mister_Tangerine152
Fandoms: Undertale (Video Game)
14 Sep 2025
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Sans confesses the truth about his past, And all of its contents.
Series
- Part 1 of Undertale AU in progress
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he's fallen in-between the lines.
he meets an old friend foe meets an oldfriend foe acquaintance.Series
- Part 2 of Sans In The Multi-Multiverse (SITM-MV)
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Chara lives a lonelly and boring life in her farm near Mount Ebott. Its peacefull but nothing really hapens.
One night after a weird dream, she finds herself climbing the moutain for reasons not even she knows, and there on the ground, she finds something that will totally change her life.
A slow burn fic focused on the daily life of the characters and their relationships, plot may take some time to appearOr alternative title - Im still stuck on 2016 and couldn't find any CharaXSans fanfic i liked, so i made my own
Hope you guys like ituptades slow! Usually once a month!
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Gaster wants answers to his questions, regardless of the universe he’s in. (Even if he inadvertently caused those questions himself, intentionally or unintentionally…)
He’s been alone as long as he remembers and the only thing that could be a “clue” to his identity and hidden memories is a metal plate drilled into his right hand.
Or Gaster tries to find answers but everything goes worse for him.
Handplates! AU (reversal of roles)
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W. D. Gaster: the Heart, the Brain and the SOUL by WittyWind
Fandoms: Undertale (Video Game)
13 Aug 2025
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“The weight of the head of a genius is equal to its value.”
W. D. Gaster didn’t want to admit it, but he could feel it, deep inside him.
His brilliance gave a future to the Underground, a machine that could convert the heat of the Earth into energy: the CORE. The other monsters would, then, use it as electricity, and bring life to their houses and their TVs and their cars and their cell phones.
But Gaster knew more. Knew better. The CORE had so much potential, so much to offer. That kind of magic had never been used before. Gaster didn't know if he could call it “magic”, even.
He was so valuable to the Underground, but… what if that made him dangerous? What would happen if he had discovered something that shouldn’t be touched, not even by monsters or humans?
W. D. Gaster didn’t want to think about it, but he could feel it, deep inside him.
What is the value of a genius, if he’s so terrified of the weight of his own head to ever use it?
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Hey there guys, I am starting an Ask series where you can ask different Fandom Characters questions!
I just want you to know that some of the answers you get, may or may not be canon...
So please respect the answers you get.Series
- Part 2 of Ask Series