1 - 20 of 55 Works in Undyne (Undertale) & Reader
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Monsters have come to the surface, and with that a lot of probelms have been caused, so maybe a marriage between two people from the two races might help?
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The barrier stood before you. Its white glow radiated throughout the expansive room, beckoning you forward, urging you to shatter it.
“Nah, I don’t think I will.”
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Or alternatively:
The reader decides the Underground is WAY better than the Surface and doesn't set the Monsters free. Cue shenanigans with Flowey. -
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Summary
As Monsters begin to live on the surface once again, you meet an eccentric group of monsters while volunteering. From sickness, health, and beach trips gone awry, you get to know the pretentious Dr. W.D. Gaster and co. Maybe he isn't as much of a prick as he lets on.
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Getting Thrown Into Your (My) Comfort Video Game by Ccaamm15
Fandoms: Undertale (Video Game)
01 Sep 2025
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Summary
There’s no other way to say this. One second you’re picking up your controller to play a game, and the next you’re in it! You’re in your comfort video game! You can befriend all those guys like you wished to!
There are definitely no consequences to doing what you want because this is all a game, right? You’ll eventually wake up from this dream and it all won’t matter.
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With Monsters on the surface, the rumor of a war and revolution against the royals of Ebott spread across the nation. Somehow, you found yourself smack dab in the middle of it all. All you had wanted to do was find a job that supported you and your little siblings until you could reunite with the rest of your family.
Series
- Part 1 of Serve & Protect
- Part 5 of Papyrus/Reader Fics
- Part 10 of Undertales Across the Multiverse
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You're a simple person. You move quietly through life, taking classes and going home to enjoy your time as you please. You live near Mt. Ebott, and after the barrier's shattering monsters have slowly started surfacing into society and daily life. Although unaffected at first, perhaps it was stupid to think you could get by without ever interacting with monsters. On a morning that feels all too regular, you hurry ahead to class and run into a group of monsters. You pay it little mind, but that quick encounter would end up planting the seeds of great change.
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Will of the Graveyard by neewlowo
Fandoms: Undertale (Video Game), Pocket Monsters | Pokemon - All Media Types
23 May 2025
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Summary
Getting crushed by a bus a shitty winter day is never the way anyone wants to go, but waking up as a skeleton under the hands of some fucked-in the head doctor, whom of which is ALSO a skeleton? Yeah right.
Well, at least you have this voice in your head to talk too that is apparently some sort of System, and this world has Pokemon.
How cool, you're living a dream! You're a trainer!
Now if only you could stop being traumatized for like five minutes. That'd be nice.
Series
- Part 1 of MixedTrainertales
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Summary
Y/N and Undyne share an intimate moment in the shower after their Hangout that was set up by Papyrus.
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Alex in the Undertale world by APJtheartist
Fandoms: Undertale (Video Game), Original Work
03 Apr 2025
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Series
- Part 6 of Extra of my serie with Travel with Alex the world creator, but these I didn’t end up using
- Language:
- English
- Words:
- 1,416
- Chapters:
- 2/?
- Hits:
- 33
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I think I only want you under my mistletoe. by luiexette
Fandoms: Undertale (Video Game)
24 Jan 2025
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Series
- Part 1 of Lui's collection of One-shots
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The Drifter by orphan_account
Fandoms: Undertale Yellow (Video Game), Undertale (Video Game)
11 Dec 2024
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Summary
Mount Ebbott. Legends surrounded this mountain of several thousand monsters once being sealed in its catacombs. Airships tended to investigate, but found nothing. You wanted to see if you could explore this place, and in doing so, you fall down into the Underground: the home of Monsterkind.
As things turn out, you gain many friends in the Ruins. Toriel, a kindly goat woman, whom you quickly began to see as a mother figure; Dalv, a rather nervous vampire who mistook you for a different human, and many more! Especially Froggit. Froggit's amazing. But you wish to leave the nest- so you do, your friends giving you the means to disguise yourself, and live in peace without threat of a magical blade against your neck.
...But how long can you keep it up before your newfound friendships in the Underground outside the Ruins shatter to pieces?
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Oops... by Pixel_Art_Teapot (Voissy)
Fandoms: どうぶつの森 | Animal Crossing Series, Undertale (Video Game)
23 Nov 2024
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Summary
You love Animal Crossing. When your friends got switches, you got them the game. However, you made them wait to start the game until you could all start it together. The night is a disaster, to say the least. But living out Animal Crossing WAS a dream of yours...
~~~Or~~~
You love the game. You are now in it.
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You never wanted any of this. All you wanted was to chill at home, but the universe clearly had other plans.
Series
- Part 2 of Play Your Part
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Maybe it was a bad idea to move in with your sister's skeleton harem.
And to make such a deal that is obviously balanced in her favor.
But what does it really matter to you?
You have your son and that's all that matters.
(Enjoy a classic anti-harem as a morally questionable mother who is an absolute bad bitch)
Series
- Part 3 of Mama
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Not Your Doll - Underfell Edition. by LadyAnatares
Fandoms: Undertale (Video Game), Underfell - Fandom
30 Apr 2024
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Oh golly gee, are you ready for this? This is Not Your Doll - Underfell AU edition! Here I will be taking my story chapter by chapter and inserting in everyone's favourite edgy monster cast into it.
One cold winter day, you accidently run face first into the cement ribs of a dangerous skeleton monster. And feeling both annoyed and brave, you accidently threaten to dust him. Feeling marked, you then you run into him again. And again. And, honestly, you're not quite sure why he hasn't just killed you yet. Is he toying with you?
This will also serve as a request fic! At the bottom of some chapters I will take a poll for some decision to be made about the story's progression. Sometimes it will be hidden, though, for something that has NOT happened in the canon core timeline :) Enjoy!
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undertale mains with reader whos disability makes them tired out more by Stellar_Starlight
Fandoms: Undertale (Video Game)
15 Oct 2023
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- Part 6 of neurodivergent and disabled readers
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Summary
Got the plot from a prompt generator! This oneshot made its grand premiere on Discord during the 'AO3 down' crisis. Keywords given by the prompt generator : Hotel, undefined, A/B/O dynamics, Spooning.
Series
- Part 2 of Prompt Generator My Beloved
- Language:
- English
- Words:
- 1,483
- Chapters:
- 1/1
- Kudos:
- 27
- Hits:
- 442
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Summary
Reader plans their own death, and no one knows about it. They create a bucket list of things they want to do before they go, planning on spending time with all their new friends.
(Trigger warning for suicidal thoughts and symptoms of depression.) -
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Summary
It's so hard for you to say it.
(...But, let's face it.)
Series
- Part 14 of Never Forget
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𓆩*𓆪 Bringer Of Hope 𓆩*𓆪 by Owl_Kat (orphan_account)
Fandoms: Undertale (Video Game), Deltarune (Video Game)
25 Nov 2022
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Summary
Sans machine that sat in the garage had been placid for as long as he could remember - never once working even when he so desperately wished it would.
Multiple time-resets later, and everything is still the same. Never changing, except for at the whims of what that kid desires.Except for when a new “anomaly” enters the time line. There is but a glimmer of hope, hope for something new.
For once, the machine works, but not in the way anyone expects. Space starts to get more crowded as new - but not unfamiliar - faces appear more and more in the underground.
Yet no one took into calculation how love would find a way to worm into everyone’s hearts as they all learn to work around the new aspects of their lives.
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I couldn’t fit all the tags a wanted, but Underfell, Underswap, SwapFell, FellSwap, Horrortale, and probably other AU Sans and Papyrus’ will show up.
Underground arc: Ch1- Ch
Deltarune arc: Ch - Ch
Surface arc: Ch - Ch