1 - 20 of 193 Works in Evil W. D. Gaster
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Long ago, two races ruled over Earth: Humans and Monsters. Religion and fear of differences troubled the fragile peace on which both species were living so far. A war for faith and honor soon engaged between them. Long. Endless.
Sans and Papyrus, two young skeletons brothers, sons of the Royal Scientist, lost everything in the rage of the fighting: their home, their family, their childhood. During a human attack, they suddenly found themselves delivered to bullets and bombs, all alone.
Both of them started a journey in the devastated landscapes of the end of the war to join Mont Ebott, where Monsters are preparing for a last battle. But could two kids survive by themselves in the wild and without any help?
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You were a normal human. You went to college, you had a life, friends, family, etc. Apparently, the void didn’t care much for happy endings, and you find yourself strapped to a table in an underground lab.
It’s fine, you have plot armor.
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Or, you get sucked into the void and your soul is placed in the body of eight-year-old Sans.
Arc 1: Heritage (1-7)
Arc 2: Hell (8-10)
Arc 3: Home (11-45)
Arc 4: Heart (46-59)
Arc 5: Hostage (60-?)Series
- Part 1 of How To Be A Human Being
- Part 1 of Hounds Of Love
- Part 1 of I/Me/Myself
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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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"You limp towards the door, every step is agony and you feel exhausted, your vision goes blurry once more but you continue to the door, determined."
Readers will get to vote on this story, choices will be displayed at the end of the chapter, more details in Author's note.
"There are no happy endings, because nothing ever ends" - The Last Unicorn (1982)
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You made one mistake, thinking you could sneak through the CORE undetected.
Now you're Subject 01 in Dr. Gaster's underground laboratory, where the boundaries of science and ethics dissolved long ago. The sterile walls echo with sounds you try not to think about, and each day brings new horrors disguised as research. But even in the darkest places, unexpected connections form. A visitor who shouldn't exist, promises whispered in shadows, and the fragile hope that maybe, just maybe, escape is possible. -
The Shadow in the Knight’s Hand by Metal_Overlord93
Fandoms: Undertale (Video Game), Deltarune (Video Game)
07 Sep 2025
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In the quiet town of Hometown, everything seems peaceful… or so it appears.
Kris Dreemurr, a lonely teenager haunted by a past tragedy, struggles to find their place. With their brother, Asriel away at college and their best friend Noelle growing distant, Kris feels more isolated than ever. But along the way, they form new friendships, and slowly begin to reconnect with Noelle.
Meanwhile, whispers spread of a mysterious figure appearing around town, a cat-like shape with haunting pink and yellow eyes. Some say it appeared after the disappearance of December “Dess” Holiday.
Now, with strange “Dark Fountains” opening across the land, Kris and their friends must uncover the truth behind Dess’s vanishing and confront the darkness threatening to consume their world.
Series
- Part 1 of UT/DR stuff
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Monsters and humans have always been so innately different, that was one thing both species could agree on. As such, there was a severe lack of research on humans, their bodies and how they functioned, their emotions ...
It was so hard to find a willing human, so why should Gaster have to?
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A certain doctor steals you from your comfortable, average life without warning to run experiments on your body. It's for the greater good of education and knowledge, so why are you so upset?
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My hummingbird (W.D.Gaster/Reader) by OMGwhyamIadegenerate
Fandoms: Undertale (Video Game)
27 Aug 2025
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"Ladies and gentlemen, please welcome our queen of the opera, Y/N!"
The noise, the magic, everything making your heart fill with emotion and your body shake with excitement. This is your life.
About 10 years ago, the monsters from the Underground were freed. Unfortunately, the hope of pace was quickly buried under the shadows of the mafia. The human mafia king and the monster mafia king, king Asgore, formed an alliance, covering the shadows with eyes, ears, and fear.
You are a 28 years old opera singer, the best at your job. This is your dream and love, music. Since a child, you fought your way up, alone. But one night, you feel another type of magic, one you never felt before. Your new bodyguards, the skeleton family, intrigued you with their mystery, especially the man named Gaster.
This time, you won't sing a story nor play a role, this time, you would truly feel the power of the most dangerous magic, love. -
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Just when he's lost everything, Spamton G. Spamton is approached by a stranger in a dark suit. They offer him a deal: spy on the Knight, and he'll want for nothing. The answer is obvious. However, once that can of worms has been opened, there's nothing Spamton can do to stop the chaos that follows.
This is a Spamtenna novel that follows the series of events occuring before the main gameplay in Deltarune, focusing on who W.D Gaster is and Dess's motivations as the Knight. Tenna and Spamton are both bound by contracts to serve as their proxies, but what happens when their relationship causes them to violate their deals?
(Description subject to change)
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Written in journal entry format with occasional 1st person present writing.
≫ ──── ««•◦ ✪ ◦•»» ──── ≪
Taken from home, [y/n] is trapped in an underground lab with no memory of who they once were. Left with nothing but a semblance of sanity, they begin to make journal entries.
Series
- Part 2 of Undertale Stories
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The Dark World is alive, and dangerous. Luckily for people like Susie or Ralsei, the effects of exposure don't affect those made of magic, whollely or partial so. Unluckily, Kris isn't at all. Even more unluckily, nobody but Kris (And some silent partners) knows this. And that infection would sooner kill them both than let Kris mention this.
Between a sapient infection, and the repressed memories it keeps bringing up, Kris isn't having a good time.
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Nightmare senses a sudden large amount of death inside a Horrortale AU variant. He goes there to investigate and finds something he never expected: a human child. An Aliza variant to be precise. He didn't think much of her at first but she was going to change the entire Gang's lives permanently.
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Hello humans
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"Kris was only 13 at the time, but they were old enough to understand what a divorce was. They were old enough to understand that their parents should’ve gotten divorced a lot sooner. And during every fight, they found themselves wishing that Asgore would be kicked out. But he never was.
A presence in the corner of the room pulled Kris out of their thoughts. They looked over, and due to the tears blurring their eyes, they were only just barely able to see their familiar Friend standing there."
[-or,-]
w.d. gaster is kris' imaginary friend !! bad things happen.
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Crash out tale (a joke au) by im4gi_nati0n_fact0ry, Ufpapyruscafe, Wimidicus
Fandoms: Undertale (Video Game)
24 Jun 2025
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What if someone turned out to have more determination then frisk?
Frisk, after killing again, and again, lost determination, losing resets. Sans took advantage of that and killed frisk, but frisk managed to reset before dying, but then...why did 2 need humans fall down?
Series
- Part 1 of Every universe there's us
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And then, before I knew it, the earth was shaking up behind me. Deep cracks started to form, cracks whose insides seemed to lead to darkness.
And suddenly, I was falling.
Dess Holiday is the Roaring Knight, the being destined to bring about the end of the world. This is how they came to be.
Series
- Part 4 of Sweet Dreams
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His other hand activated the recorder. The red light blinked to life, casting faint illumination on the darkened lab. Everything around him was a monument to forgotten science: faded monitors, humming generators, glyph-covered machinery that hummed in a language only he still understood. He leaned in, eyes glowing dimly behind his cracked skull. “You’re not going to like this,” he said, not without sympathy. “But then, progress rarely asks for permission.”
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Day nine: June of Doom- Gaster experiments on a human child.
Series
- Part 9 of June Of Doom 2025
- Language:
- English
- Words:
- 335
- Chapters:
- 1/1
- Kudos:
- 2
- Hits:
- 72
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Well this is new (may change) by Jackson_silver
Fandoms: Undertale (Video Game), Five Nights at Freddy's Secrutiy breach
04 Jun 2025
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So, waking up as a teen sans with the memories of my...his? Brother dying wasn't really in my plans. Realizing that I died and can't go back is even worse. Now they are saying I'm too young and need to be adopted? Lovely.
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Like all humans, Frisk grew up in an underground orphanage raised by their loving mother Toriel.
Unfortunately when they go to return a stuffed rabbit their entire world view is shattered, and with the "help" of a skeleton they have to find a way to save their siblings before it's too late..
Sans would be dead if it weren't for his older brother's position at the "Rainbow Factory." He pushed through life knowing that he had no real purpose due to his weaker magic and turned to various things to cope.
Until one day his friend from the ruins makes him promise to look after a small human child.
Turns out he has more purpose than he thought he did. But is it worth the risk?
(A TPN x Rainbow Factory Undertale AU)
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You were a normal human. Seventeen, just got accepted into college. You had a full life ahead of you, close friends and family. You still had things to do. You weren't done yet.
The universe doesn't seem to care, and you wake up in a lab to a narcissist skeleton and trauma.
What the heck. This is NOT what you meant when you said you were tired of life, bro.
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Or, your soul is placed into the body of eight-year-old Papyrus.
A retelling of Running Up that Hill, but Keigo and Apollo (Sans and Papyrus) are swapped.
Lets see who has plot armor now.
Series
- Part 4 of How To Be A Human Being
- Part 2 of Hounds Of Love
- Part 3 of I/Me/Myself