1 - 20 of 1,681 Works in Undertale Monsters on the Surface
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My Roommates From Another Universe by FandomWorld9728
Fandoms: Undertale (Video Game), Underfresh - Fandom, Fellswap Gold - Fandom, Inktale -Fandom, Dancetale - Fandom, Danceswap - Fandom, Dancefell - Fandom, Mafialust - Fandom
29 Sep 2025
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Summary
Your life has been complicated since you could remember. It only got more complicated when you were thrown into a completely different world and your new roommates happened to be different versions of the same two skeletons.
Series
- Part 14 of Undertales Across the Multiverse
- Part 11 of Papyrus/Reader Fics
- Part 10 of Sans/Reader Fics
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Summary
You and Frisk decide to take a day off to have a picnic in Mt. Ebott, something to take your mind off work while waiting for winter.
So why, why are you now on the police office?
Why are you putting missing posters all around the city?
Why did you take them there? Where are they? Why did your worst nightmare become something real?Where are they?
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I don't have a summary i just pulled this out of my ass but if you like a slow burn with a Lot of Words and Feelings™ and Sans pleaseee give it a try.- Language:
- English
- Words:
- 1,710
- Chapters:
- 1/?
- Hits:
- 21
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Apathy's a Tragedy (And Boredom is a Crime) by Amy_Mask8119
Fandoms: Undertale (Video Game)
28 Sep 2025
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Summary
Sans is an ordinary guy living an ordinary life. He may be the laziest pun-lover ever exist, sure, but there's nothing unusual about him. Average grades with no standout subjects and a dull, repetitive jobs shaped a fixed routine of wake up(late), eat, work, eat and sleep. Even birthdays blurred into the same numb monotony when you celebrate it every year.
Maybe that's why, when Alphys, the royal scientist of monsterkind, made a major breakthrough in alternate universes, He was one of the first in line to explore them.
Because surely, meeting new people will be enough to satisfy his boredom, right?
But alas, new people are still just people. And the more you know em, the less exciting they become.
Too bad that boredom is a crime that he'll do absolutely anything to avoid committing.
So when he stumbled upon a clash between the Bad Sanses and the Star Sanses, instead of running away, he found himself a nice, safe spot at a distance to sit back and watch.
He never expected to get caught.
He definitely never expected to get dragged into the center of it all.- Language:
- English
- Words:
- 14
- Chapters:
- 1/?
- Kudos:
- 1
- Hits:
- 27
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Summary
Wake up buried in snow, alone, and with no memories?
Check.
Kepp seeingg numbers, words, and text floating around every object and surface as far as the eye can see?
Also check.
Why does every person he meets say he needs help?!
His perfectly fine if you ask him."I wonder what determination taste like"
Note from the author:
This is my take on Fatal Error—a much more none canon, this isbt even OOC this is just straight up diffrent person with the same name, amnisiec version of him.
He’s also not fully canon-compliant in terms of power scaling and has and maybe different origin and personality.
It’s my reimagining of him.
Glitchy, lonely, and filled with questions, bad puns, power to blow up annoying people and some more puns. -
Top of the class, bottom of the heart by reincarnatedfrog
Fandoms: Undertale (Video Game)
27 Sep 2025
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Summary
Monsters have lived alongside humans for a decade now, and you’ve dedicated your studies to understanding them. But on the first day of your third semester, a scoreboard in the university’s new building throws you off balance—because the top name belongs to someone you’d have sworn wasn’t even trying to stand at the top.
Get to know a strange human with an even stranger family and friends, and experience chaos across both the surface and the underground in this little writeup of mine!
Story mostly exists cuz I am a Chara simp and there's not enough slow burn out there that gets heated later on ngl. -
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Summary
The mating process unfolded in three distinct stages: Selection, Gift Giving, and Consummation.
Monsters mated for life, a commitment not to be taken lightly, and humans retained the fundamental right to refuse at any stage.
After the selection, when a Monster presented a gift, the human had exactly two weeks until the peak of mating season to accept or decline. Due to the immortal nature of Monsters, the minimum mating age for humans was set at twenty-five.
Beyond these basics, the intricacies of Monster courtship remained shrouded in mystery, even as they loomed large over human existence.
What follows are personal accounts from couples who consented to share their experiences for research purposes.basically a series of meetcute smutty oneshots with each skelebro
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Life sucked, that's how all these start out, right? well they are true. life fucks you over, and just as you get back on your feet will do it again.
you loose your job, your apartment, and your fiancé cheats on you constantly. you say fuck it all and go to the safest bar for any woman to get smashed on magical alcohol.you didn't know you'd end up sleeping with your new boss before you even were hired. or applied for it, but fuck it paid good.
(this is based of a kinktober one shot, you will get to suggest what you want to happen when i ask in the end notes! so please keep an eye out.)
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GENERATIONS: Memories Alight (Freedom AU Book 13) by MapleInk62
Fandoms: Five Nights at Freddy's, Undertale (Video Game)
23 Sep 2025
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Summary
Fazbear Entertainment had always been able to easily control Anthros in the past, taking great advantage of their lost memories for far too long. And now, after all this time, these memories have been brought back to light, restoring what had been for too long shrouded of each Anthro...
Yet, while the Anthros may have regained their memories, with it comes a realization that some may need process their pasts at a slow pace. As it goes, the good memories aren't the only ones which have been restored. Not all is simple clarity as each Anthro recalls their individual pasts, and puzzling line of family generations.
Series
- Part 23 of Freedom AU [FNAF/UT]
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It's six years after the Emergence, and while most of the monsters decided to stay close to the mountain on the west coast, slowly but surely a good few made it over to the opposite coast and settled down in Washington DC. Besides the King and Queen and their human child - relocated to the political center of the US for obvious reasons, you mostly see dogs, bunnies, and cat monsters integrating themselves among your coworkers and neighbors. Things aren't perfect, but they're improving day by day.
You have a stable job as a PR and Marketing Expert, a handful of close friends, and a stable and predictable routine.
When you randomly meet a brand new type of monster in town while late night shopping, you can't help but be frightened of him. After all- he's literally a living skeleton! Embarrassing, but at least you'll never have to see him again... right?
What happens when fate has other plans, and you just. keep. running into each other?
Let's find out.
Series
- Part 5 of The Butterfly Effect 💚💛🧡💜💙🩵❤️
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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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Ever wondered what happened after the true pacifist ending, ever wish you could see all your favourite characters live out their happily ever afters on the surface, want to see what life is like when humans and monsters start living side by side again,
Well, since it seems like a proper sequel to undertale is never gonna happen, I've decided to make my own version that encapsulates everything I loved about the original game and how I think things would play out after the ending,
Hope you enjoy the story.
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Frayed Strings and Broken Promises. by TheHourglassForest (HourglassForest)
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
18 Sep 2025
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Summary
A life cut short,
sometimes can be a life worth saving.But is the effort required in doing so worth it?
And if done, what would be the cost?
There's no such thing as a deal that is too good to be true.And yet, some don't heed the warning.
This will cause devastating effects later on.
It's up to Clover and their friends to figure out how to deal with this situation.Series
- Part 1 of The Forest Beyond
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When worlds collide, does the dust of our past remain? by Groovyneverglooby, Lemoneon
Fandoms: Undertale (Video Game), Deltarune (Video Game)
15 Sep 2025
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Summary
When the storylines of Undertale and Deltarune converge, and Determination is scattered into the wind; Kris, Susie and Ralsei are forced to traverse an old world forgotten to time by it's bygone residents, exploring those who are mere memories left behind of the past- gathering friends both new and old, learning things they never once considered, and perhaps, forging some new connections along the way.
~currently no update schedule, we js spamming chapters whenever~
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Justice is BLIND to evil doing UNSPEAKable acts of kindness by Anjel_X for silverryu25
Fandoms: Undertale (Video Game)
15 Sep 2025
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Summary
When a horrible event happens to one unfortunate AU, their saviors end up being the last people one would expect...
Why would the bad guys do such an act of kindness... and is there more to it than that... they'll just have to hope a certain Trio doesn't give them a Bad Time™ in the process...A Kustard fic with an unexpected twist in the form of a Nightmarish poly of miscreants
My Secret Santa Gyftfic for fellow Kustard and pun lover, the SANSational Silverryu!
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A year after the Barrier has been broken, Asgore holds a celebration. A party at a large banquet hall in the city of Ebott. Sans figures he might as well go, see how everyone's doing a year later.
Little does he know, while everyone else is looking to the future, he is being reminded of the past.
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Are you… there?
Are we… connected?
…
Greetings.
Why don't we…
…just get to the point?—
Written in celebration of Undertale's tenth anniversary. More chapters coming once I finish other projects.
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Dream sans is in danger the bad Sanses are after his life and staff inorder for nightmare sans plan to work it's up to frisk to stop them and save dream sans and the world will they be able to do it? Or will the bad Sanses succeed
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Error's hands stopped what he was doing as he immediately faced Sans. “Sure, go ahead, you can ask me anything, Sans!” Error shot up, always eager to be of use to Sans.
Anything, huh?
Sans thought about it a moment, was he really going through with this? He usually didn't bother but when it came to Error it was different, love really made people foolish sometimes and Sans was proud to be in that majority. “so I had been thinking… care to teach me those strings of yours?”
On a random Tuesday, Sans couldn't help but be drawn to how Error seemed to effortlessly use those blue strings. Sans had been curious about it for a while and decided to ask his hubby about it.
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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.