1 - 20 of 1,623 Works in Undertale Monsters on the Surface
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Cross and Dust come to a Swapfell dimension not expecting to find a Healer. Who is this mysterious woman the two of them stumble upon along with the Sans and Papyrus of this dimension?
Series
- Part 3 of Kaleidoscope
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Summary
A mutation has spread across the globe when monsters were released, humans either dying as their bodies couldn’t handle it or mutated with the rest.
The mutation was simple really, a change of dynamics. Humans started taking more unusual forms, growing more than a few ears, eyes, arms, legs, shit even a head at one point. Or body morphing differently altogether. Turning into their worst nightmares.
Y/N being a young child at the time of the outbreak changed with the rest of her family, half of her family died or killed themselves resulting in her being an Orphan at a young age, left alone in the world as her body shifted and changed. Body becomes leaner, smaller…cute. Cat-like ears and tail sprouting from her body, legs breaking and reforming into back hind legs of a cat's, fur covering her legs stopping at her waist.
Not only that, but she is an Omega.
Of course she doesn’t know oh no no no blissfully unaware, well that is until an over caring human Frisk decides to visit the Orphanage dragging along her friend Chara. Whom in turn absolutely dreads the visit. Let's say…frisk was the door to meeting a rowdy group of skeletons…
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A stand-up comedian with a bad temper and low motivation ends up falling for Frisk's homeroom teacher, her irritatingly soft voice, and her smug attitude.
Who would've known?
There's probably a lame old joke hidden in there somewhere, but he doesn't give a damn about that right now, so maybe come back later, and he'll think of something.
(Mostly told from his perspective, but there will be chapters featuring Second Person POV.)
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“Long ago, two races ruled over Earth: Humans and Monsters. One day, war broke out between the two races… After a long battle, monsters were victorious.”
They say a human child will rise to the surface and free them all.
Seven years ago, the first human discovered they could push through the magical spell monsters placed to keep humans sealed underground. They never returned. Every year after, a human child was chosen to go up and try to make peace with the monsters. No one has ever returned. No one has freed them.
No savior has risen
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Summary
Sans isn't looking after himself anymore.
He barely gets out of bed, barely showers, and barely eats.
Papyrus is making it big out there, and Toriel has the potential of becoming a teacher within her grasp.
Left alone to assume the role of Frisk's deadbeat uncle while everyone else achieves their hopes and dreams, he feels like he's been handed the short end of the stick.
Frisk decides the best way to help Sans is by shoving him into a series of awkward encounters with their single mother.
So, when Sans notices they're playing matchmaker to try dragging him out of his destructive cycle, he tries to stop it, though it's too late.
He already has a cute lady wanting to jump his bones and rattle him up, and all it took was making himself look decent for a date to McDonald's and Baskin-Robbins.
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Summary
It started with one moody skeleton crash-landing in your home. Then he started bringing friends. All of a sudden your apartment is a multidimensional nexus for an awful lot of monsters named 'Sans.' They're all a little rough around the edges, but they're sweet in their owns ways. You probably should have guessed they were the "bad guys" though. Oops?
Alternate Summary: BadGuysOnly reverse harem
Series
- Part 1 of Gloom & Doom Extended Universe
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It all started with a housewarming party where only you showed up. Now, you're tangled up with multiple skeletons and a woman that hates your guts for no reason. As much as you want to act like you don't care, you really do, so what do you do now?
It's not like you can survive on your own.
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You had a serious problem. You had a big, fat crush on Sans. The only reason it was a problem... was because he was the brother of your best friend. How were you supposed to hang around him if whenever his brother came in the room, you were a blushing mess?
Series
- Part 1 of Sans/Reader Fics
- Part 2 of Undertales Across the Multiverse
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Summary
The dichotomy between black and white is your constant when it's time for you to meet the whole new civilization Frisk brought along with them to the Surface.
As a parent, it's not easy to trust others when they've hurt your child.
So when that new civilization decides they owe Frisk both for saving their kind and for still hurting them during that process, you've got plenty to say to them.
Forgive as easily as you once did with others during a stage of naivety? Oh, hell no.
They better have a good reason for hurting your child and an even better one for wanting to be a part of their family.
• • •
Full Arc List:
Arc 1 | Ruins
Chapters 1 to 15 (✓ complete)
Arc 2 | Enemy Approaching
Chapters 16 to 25 (× current)
Arc 3 | Pathetic House
Chapters 26 to 30
Arc 4 | Spear of Justice
Chapters 31 to 40
Arc 5 | Here We Are
Chapters 41 to 50
Arc 5.5 | Good Night
Chapters 51 to 55
• • •
(Important Notice: If this work seems familiar, it was originally published in 2020, but was deleted due to various health issues!)
(OLD WRITING LASTS UNTIL CHAPTER 25.)
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Hold on tight to this time, this place (‘cause everything you know will be erased) by Whitelotusesarentsopure
Fandoms: Undertale (Video Game)
13 Jun 2025
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Summary
“it’s dust.”
”….huh?”
“my name. it’s dust. now we aren’t strangers.”
“…Dust… as in..“
“yeah s’ exactly what you’re thinking. so quit askin’ me questions and shut up already.”
“You got blood all over my place. I just saved you from bleeding out. You could at least be nice.” You bit back, annoyed.
Eye lights glared at you in the dark.
—
Or, the grouchy skeleton keeps coming back for some reason.
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Swap!Sans awakens in a maze of forgotten catacombs and accidentally awakens an ancient demon and his eternally faithful servant.
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A Cog in the machine by saszac
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
12 Jun 2025
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Summary
Asgore compleated his goal against humanity, and this will have dire consequences for the revived fallen humans
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Sweet as Sugar by Beewritesstuff (Mimispace)
Fandoms: Undertale (Video Game), Deltarune (Video Game)
12 Jun 2025
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Summary
The Barrier was broken, Monsters are free...
...and Papyrus couldn't look away from the pretty girl that always comes into the shop at five o'clock.
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Seemingly at random, you swap body with a skeleton with a big hole in his skull.
Just as you're getting used to it, thanks to his super sweet brother, more skeletons appear.Why do you switch like this? Is there a pattern?
And why are these two so damn charming? -
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Summary
Edge has had enough of Stretch's tauntings about getting into everyone's pants and decides he's going to finally take matters into his own hands and seek out someone to break his virginity streak.
Series
- Part 1 of Edge and His Many Conquests
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You're a thirty-year-old virgin, and it doesn't look like that's going to change anytime soon.
Being raised by a grandmother devoted to everything holy, you've been sheltered and kept from having a normal social life ever since you could form a thought.
It's no surprise you're the prude of your friend group, and that everything remotely different from what you're used to leaves you feeling completely incapable of overcoming the limits you've set upon yourself.
So, when the Barrier breaks and monsters establish their new lives at the Surface, you're forced to adapt to those sudden changes and overcome your limits.
And, as fate would have it, working at an elementary school near Mt. Ebott, you end up becoming the Monster Ambassador's homeroom teacher and seeing these monsters too often for your own good.
One monster in particular, a skeleton man you were too shocked by to introduce yourself properly at first, ends up becoming your friend, in spite of your best attempts not to get too close to him.
But then fate kicks your ass further and brings you to a circumstance where you have to let him stay at your home, and where you wake him one night by calling his name while you're asleep.
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GENERATIONS: Memories Alight (Freedom AU Book 13) by MapleInk62
Fandoms: Five Nights at Freddy's, Undertale (Video Game)
10 Jun 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 the missing parts of each effected 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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Summary
Uh I suck at this shit so soriel fic for all also 'Juicy'.
- Language:
- English
- Words:
- 64
- Chapters:
- 1/1
- Kudos:
- 2
- Hits:
- 106
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Summary
What does Reaper dream to come true?
Will he get what he wishes for?
Enjoyy!
(Undertale and its characters belong to Toby fox. AU sanses belong to their creators. Plot belongs to me but if someone also made something like this, I didn't know)
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(THIS IS NOT STOLEN! I AM CONTINUING A FANFICTION THAT I ORPHANED 5 YEARS AGO!)
~You know, like the Notebook. But with less chick flick moments~
(Y/n) is running out of time in this world. So, what does she do? The only logical thing. Complete her bucket list! Filled with Determination and a bit of Bravery, she does everything she can to finish it in time. Will she be able to? Of course! Especially with a very attractive skeleton helping her. But, will meeting him spark a new desire to live?
Series
- Part 1 of Papyrus/Reader Fics
- Part 1 of Undertales Across the Multiverse