1 - 20 of 34 Works in Skeleton W.D. Gaster
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Summary
Gaster's project was supposed to shape the future--instead, it broke it.
When paranoia collides with a boldfaced plan, Gaster's erasure is prevented. Everything the project was built on collapses around him. Even though he is spared, it wasn't without a price.
One of his subjects takes his place.
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The Odds Of Being The Only Human by That_Red_From_Brasil
Fandoms: Deltarune (Video Game), Undertale (Video Game)
25 Nov 2025
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Kris's childhood growing up in Hometown and the struggles that come when you're the only human in town full of monsters
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Being human is not all that cool in the Deltarune universe and also some spooky shit happens by the end.
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The More You Know! by WhatamIDoing_GoodQuestion
Fandoms: Undertale (Video Game), Deltarune (Video Game)
11 Nov 2025
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Twice did Seam hear about this strange door from their friends, a door that appeared in a hallway that wasn't always there. Only once did they see that door, and only once did they enter it.
That's how they met The Man.
Like a 5+1 thing but it's a 2+1 instead because that's all I could come up with.
Series
- Part 3 of Darkners? How About Monsters!
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Two people of completely different backgrounds and ways of existence die at the same time, in almost the exact same manner. Due to a grand, universal, mathematical error, they are now forced to live out their lives sharing a single consciousness and body. For the first time, someone is able to understand his speech. For the first time, someone is able to understand things from her perspective. Initially spiteful and overly bitter to one another, they grow attached to each other's company. What would happen if they die? How much does someone have to contribute to be deemed worthy of respect and understanding?
A commentary on loneliness and the plight of the foreigner.
A love letter to the fanfics I have read, connected with, and grown to love.
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After falling into the Underground, you find that you don't have what it takes to break the barrier. You and everyone else are thoroughly disappointed. Things are rough at first, but you slowly adjust and accept that your new life will be among Monster-folk. You work through your trials and tribulations in the Underground, make new friends, even land yourself a job, and... fall in love with a certain skeleton? How charming.
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Sorry for the really vague description, this is my first fanfic :P
So.. I hope it's bearable and that maybe someone will enjoy it ! -
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Undertale Skeleton Head canons & History and such for Again! Again! Fanfiction.
Written like an Informational Book.
Free to use with Credit given in Summary, Notes, or otherwise.
Series
- Part 1 of Undertale Skeletons
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Refraction (Do My Eyes Deceive Me?) by HyperfixiationMoment
Fandoms: Undertale (Video Game)
22 Sep 2025
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In which Dr. W.D. Gaster messes around and finds out. He's trying to do good things! He wants to help people! However, an obstacle puts the final nail in his career's coffin. The stars aren't supposed to feel cold.
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Two Old Men by oldman_turtle1782
Fandoms: Deltarune (Video Game), Undertale (Video Game)
20 Sep 2025
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Gaster is experiencing the insanity of living in a void, where he's extremely lonely. He has his player, and his Deltarune, but nobody else.
Until someone comes along for a bit.
A turtle yaps on about life, and the skeleton of what's practically a smaller godzilla listens. And then more happens!
(AKA: Author saw there were no gerster fics, and being the biggest gerster shipper alive in the 3 that exist, had to make one! thanks for everyone who supported me, couldnt do it without ya :3)
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The story of the human and monster war, now days just another bedtime story, but that is for the humans. Monsters live trapped underground, they have gone through famines, epidemics, lost of hopes and dreams, and all because the humans were scared of them. Hope came back when finally, a "human" fell down. But it just brought more misfortune.
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Where is my "how to raise a babybone for dummies" book again ? [REWRITTEN] by NtBub
Fandoms: Undertale (Video Game)
11 Aug 2025
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It was cold, so cold, too cold.
You were draining, slowly, as an orange whose juice would be taken....
the warm juice, the warm and red juice. Leaking, through a dam's rift.
You felt like an empty Shell, empty of what it contained, empty, too empty.
You couldn't see anymore, couldn't hear anymore, couldn't feel anymore.
You were surrounded by emptiness. An emptiness that took everything, and nothing at once. Then, Came the light.
and you were no longer… empty.
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Or when a reader who got no memory except for Undertale and common sense, wakes up as the most mysterious skeleton of the bunch ; W.D. Gaster
It's way before Frisk fell underground, but after the Asriel/Chara incident.
(ALSO REWRITTEN FIC, I released it back in 2019, then deleted my account, all fanfics with it, decided TO WRITE THEM BACK CAUSE I LOVED THEM)
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Interlopers by Jack_of_Knaves
Fandoms: Deltarune (Video Game), Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
08 Jul 2025
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After Sans' machine malfunctions, The Fun Gang and Noelle Holiday find themselves pulled into the events of the Glitchtale AU, where they prove to be invaluable allies against the evils that threaten the world and its people, human and monster alike.
However, by merely being present in the Glitchtale Universe, Noelle and the Fun Gang have unwittingly raised the stakes by a considerable amount, as breaches in the fabric of the space-time continum begin to appear, allowing humans, monsters, Lightners, and Darkners from their dimension and a myriad of others into the universe the quartet now find themselves in, including new allies that join the fight on the heroes' side, as well as newer, deadlier threats from all across time and space that, thanks to the breaches, now threaten the entire multiverse.
Can our heroes survive the coming storm? Or is all of time and space doomed to fall to darkness?
Let us begin the experiment and find out together, shall we?
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As the Royal Scientist of the Underground, Doctor Gaster was used to being given various tasks by the king of the monsters, Asgore. The first of them since they had all been sealed underground after the war was to help monsters settle down into their new home. And the second of them had been to establish a more consistent power source for monster-kind. Of course, the Steamworks had originally been developed to do the same thing, but the power it provided wasn’t nearly enough to cover all of it.
Over the course of several years, the Royal Scientist had designed the CORE and had it built, a much larger version of the Steamworks that managed to successfully run power through the entire underground. And it wasn’t even like his position had only been granted to him after being sealed underground, he’d been working for the king and queen for what must’ve been at least a century. Pros of being a monster who’s yet to have children, he supposed.
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A short story about W.D. Gaster prior to falling into his creation.
Series
- Part 1 of Undertale/Deltarune Fanfics
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Some would say his work was all he cares about. He wouldn't argue. But that would happen only when he left his lab, something so rare, he couldn't even bother to think about the comments thrown at him.
The Royal Scientist of the Underground. As some would call him, the only hope to break the barrier, keeping the whole monsterkind trapped. He wouldn't argue with those claims either.
In fact, if anyone would dare to ask him, he would agree with them wholeheartedly. He himself was the most intelligent of all the monsters, the last of his own kind.
Maybe it was due to the narcissistic tendencies that so many monsters have accused him of, or maybe it was just his own pride. Whatever it was, there was no doubt that W.D. Gaster, indeed had an important role in the Underground, a role he was well aware of. -
(Hiatus!) Patiencetale || A vision gone wrong. by solemn_solace
Fandoms: Undertale (Video Game)
09 Feb 2025
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Patiencetale is my Undertale, taking inspiration from both aus of Dusttale and Outertale. Still stuck underground, the monsters suddenly get gifted with finding books about the great outer space in the Waterfall trash dump. The books immediately fall into royal scientist, Dr.Gaster's hands for him to study and dissect before releasing them to general monster public. The monsters, thrilled to learn about such beautiful sights above the surface, begin creating any form of media they can around anything space related. The underground made what is seemingly a follow around the stars, looking to Gaster for knowledge about the things they now based their lives off of. Crystals in the ceilings of Waterfall and Hotland quickly were made into jewelry pieces. No one could walk an inch in the underground without seeing stars, artificial ones.
This au follows Sans, Dr.Gaster's son. A boy who is deemed so ill and fragile he is too be watched and not touched by a single soul, but his father of course. Gaster dreams of seeing the stars one day, after breaking the barrier, and he will do everything in his power to do so. Whether that means exploiting his son for pity, or stealing human souls to extract magic from.
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Gaster had lost count of the days since he first entered the Void, but since that day, he had watched and analyzed each and every timeline there was. Just a few more resets, he calculated, and the timelines would start to mix. He had to make things right, stop the resets, and to do that he had to leave the Void.
UPDATE 2024: NEW EPILOGUE!
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The Human souls, Preserverence, Bravery, Justice, Integrity, Kindness, and Patience, have been allowed to live again. But now, they don't know what to do, and monsters are everywhere. So they go to the last human to fall down for help, Frisk Dreemurr.
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Undyne is screwed when Gaster possess Sans and Papyrus. You don't get anymore context than that.
- Language:
- English
- Words:
- 340
- Chapters:
- 1/?
- Kudos:
- 7
- Hits:
- 95
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Hey I know this is supposed to be some fated meeting or something, but… no. by LehaniiXD for Underjumble (Blupani_Lov3r)
Fandoms: Undertale (Video Game)
19 Jul 2023
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Napstablook swaps with Sans, right? So like they’re *supposed* to be the Royal Judge.
I was wrong, of course, so here’s Napstablook refusing to be the Royal Judge :)
Series
- Part 9 of Underjumble Birthday Fics!!
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Screw the canon. Y’all ready for some cute gay and emotional healing? Yeah, me too…and it’s got KINGDINGS.
Frisk tells everyone about the mysterious man who speaks in hands, as well as the mysterious shades they found in the Underground. After finding a way to bring them all back, we get nice Dadster and sons time, as well as a nice amount of chapters with a few of my other personal favorite ships. Toriel and Asgore have decided to be friends, not exactly able to get back together after everything, but still caring enough about each other to not want to be cross forever. Toriel is the best mom, and Asriel and Chara are gonna come back eventually because I say so. Flowey will still be anround. Everyone gets a happy ending.
Asgore and Gaster are the main focus because I love the KingDings ship. Be prepared for these two to be pining for a while and everyone else just going nuts at how frickin oblivious these two are. Gaster and Asgore will both have their issues, but we get some nice comfort for them both. Gay dads are gonna be cute as fuck.
They’re be eventual smut later, and it’ll be very light. I guess if I write it well that I may do more later, but I’m not doing just a whole bunch. Enjoy all of these
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The first time Doctor W.D. Gaster takes S-01 to see the BARRIER.