1 - 20 of 1,989 Works in Sans & Sans (Undertale)
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Disclaimers:
Several details in this fic are heavily inspired by 'Blue joins the bad sanses' comic, so go check that out
Canon innacuracies: Passive and Corrupted Nightmare are the same person, Ink is the creator and not the protector, Ink, Error, Nightmare, and Dream, are all gods, Blue, Killer, Horror, and Dust's specific au timelines were all destroyed, and i took liberties with how the void works. Also, no Cross sans will be mentioned, i don't know enough about underverse, and there will be some OC non-sans God/entity/things later on. The fic will be split into parts, each lasting nine chapters.
Schedule: Once a week, on Saturday, Sunday, or Monday, and i will post art or a reference sheet with every chapter. Trigger warnings will be specified in chapter notes. I've never written for undertale before, so please let me know what you guys think :3With that said, the actual plot: After an injured Error crashes into Nightmare and Co's home, a close bond starts to form between the two gods, both forced villains. In light of Ink's attempt to kill Error, Dream finally starts to lose it, and Blue gets dragged along.
Average chapter length is 500-2000
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Killer has heard of a pond that turns people into mermaids at midnight during a full moon. After setting out to prove it wrong, things go awry.
Note: The first 3-4 chapters or so were written a year ago, but they have such a unique soul to them that I'm not rewriting.
Updates semi-daily until August, meaning I'm trying to write one chapter every day and may or may not succeed at this task. -
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What if two Nightmare variants------?
From a roleplay between me and my friend in an UTMV server.
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"Hey there, Erry! How's my wittle skele doin'?"
"I will annihilate you."
"You do that. But let me help you with your heptriphobia first, aight?"
"Get the name right, peabrain."Inky decides to help Error with his haphephobia even if he wasn't too fond of this idea. What Ink didn't expect was that his plan would horribly backfire.
Series
- Part 1 of Yanderes
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The whiteness greeted you as you woke up again. It felt almost suffocating, especially when the only other people with you didn't exactly look or act normal. You just wanted them to emote, even a little bit.
All you wanted was to not be alone but no. You were reborn as Ink after you died in a lonely ditch. Now you have to navigate the vast Multiverse with your knoweledge of your last life. As you get friends and foes alike, you notice that not everything you know is trustworthy. Especially when you're a little lost skeleton with questionable ability to feel.
After all, anything could happen in a place this big.
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Dream and Nightmare suffer from a unknown decease, but what if there was a cure?
One would do everything to have, the other, to stop their brother.
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Momento Mori (So Don't Fuck Life Up, You Don't Get A Second Chance.......Normally) by CrossoverAU
Fandoms: Undertale (Video Game)
13 Jul 2025
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Momento Mori- Latin for 'remember, you must die'
What is death, if not the end of one chapter, and the start of the next. Raine is dead. She wanted to be dead. She made her bed. Cleaned her room. Said her goodbyes. And tied the noose. When that didn't work, she slit her wrists. And when that didn't work, she took her grandfather's gun off the wall and shot herself in the head. That time, she finally did something right. Now she could sleep peacefully....
Why was she awake? She was definitely dead this time, why the hell was she awake?! And is that......Sans?! As in, Sans from Undertale?! As in the game that was one of her only reasons for not killing herself in high school?! That Undertale? That Sans? Why was he multiplying? And is that Papyrus?!
Death hurts. It causes pain to those around it even when it isn't attacking them. Then it comes for them next. If she wanted to get out of the Undertale world and back to her hopefully peaceful afterlife, she would need to show some bitches that before they bled out their marrow..... all over her damn floors?! Dammit Mutt, she just cleaned those!
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A Totally Fantastic Guide To Vigilantism by Apathetic_Blossom
Fandoms: Undertale (Video Game)
13 Jul 2025
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The world has always dealt in absolutes. It was absolute when it took Error's parents away from him, leaving behind three siblings with nothing but each other to rely on. It was absolute when it coaxed him to become something greater than himself, fueled by the pain and desire to right society's wrongs. It was absolute, when it decided that Error was the king in life's extravagant game of chess.
Or, Error is a friendly neighborhood vigilante until he's not.
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Massacre sat up and rubbed at his sockets as he looked around, confused. The last thing he remembered was the fight he had been in before- he had been pushed int one of those inky portals and now he was... where was he? He stood and scratched at his neck a little as he felt the liquid hate begin to fill the back of his throat. He needed to stay calm otherwise it would get worse, but he couldn't help how he was feeling.
Taking a deep breath, Massacre took stock of his situation, finding that he was in the garden of a castle- was he home? No...it looked way different to what home was. Before he knew it the liquid hate started spilling out of his mouth and he collapsed on the ground, coughing out what he could.
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Or: A fell version of Killer from another multiverse ends up in the regular Undertale multiverse and Nightmare and the gang take him in.
[Fic based on a roleplay]
Series
- Part 40 of Undertale Fics
- Part 4 of Roleplays
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In the beginning, there was a collective of voices. The collective needed a muse, for they could not create full universes. The only things they could make were unwhole sketches, and from one of those sketches, came their much needed muse, who was named Ink.
At first, Ink obeyed their needs. Created what they wanted him to. But when Ink wants to create on his own, the collective, "The Creators", needed another being, as their viewing of Ink's creations were deemed useless for their multiverse.
That other being is a glitch that fell into the anti-void, Error.
But, even though this issue is easy to fix, stubbornness leads to otherwise.Series
- Part 1 of FGOD AU: An Alternate Story Collections
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A multiverse where Error is a terrible evil little creature, Ink is head over heels, and Dream is exhausted.
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- Part 11 of I love love love Errorink!!
- Part 1 of Dead Meat (Wizard’s multiverse)
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Hello, my name is Mazy, now that you will be a reader soon, you are known as a Mazyville, I'm nonbinary and go by they/them. My favorite fandom is Undertale and its alternative universes. I write semi-literate so all can understand well. English isn't my first language, though, so don't be too bitter.
I'm not a new writer, but I've never written on AO3 before. I'll be taking requests for any fanfiction Idea you have, not a short, but I'll make a not-so-long story about it. Just comment with your main idea or a summary of what you want your story to be, it can be ANYthing and ANY ship.
READ THE REST OF IT TO FIND OUT MORE!! AND READ THE NOTES!!!
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Three High Ranking Members of the Mafia and a Serial Killer Walk Into a Bar... by Larry_your_waiter
Fandoms: Undertale (Video Game)
11 Jul 2025
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Sans has his own share of secrets, as the family will soon discover.
a series of non-chronological scenes in this AU of an AU because I can.
- Language:
- English
- Words:
- 763
- Chapters:
- 1/?
- Comments:
- 1
- Hits:
- 10
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Error wakes up in a game he never chose to play—Until The Last Breath, a brutal survival world hidden between life and death. The only players? People trapped in comas. The only way out? Win.
To survive, he must fight through deadly floors, forge uneasy alliances, and follow three unbreakable rules:
[ 1. GAME OVER means death, both in-game and in real life. ]
[ 2. Weapons and Items must be crafted from fragments found throughout the world by a Player. ]
[ 3. Reach the final floor before the chronometer runs out… or fade away forever. ]
There are no second chances. No resets. Just one question: can Error and his team beat the game before it beats them?
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Keep on loving! Keep on fighting!
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Cross is forced to learn his value, one step at a time.
Blue is forced to learn his limits, one step at a time.
Neither of them are happy about this. A certain group of murder-happy skeletons might make it all worth it, though.
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**TEMPORARY** haitus! this fic is NOT abandoned, i simply do not have time to update it at the moment :(
(ink belongs to comyet/myebi! i encourage you to check out the ink faq to learn more about their wishes regarding him)
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In a world where it collapses without you by me_paina for Kamisori
Fandoms: Undertale (Video Game)
10 Jul 2025
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Life hates me, and so that's why I hate life back. Some people will say it's just satisfaction to do so, or some sort of mentality of: you hate me, I'll hate you back.
But no.
Not for me.
For me, it's the line between life and death. A rule I must follow because...
Nothing will ever go right for me, no matter how evil or heroic I be.
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What happens if I replaced Y/n with Delta, my demon oc? How would the world of Zombietale change?
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Delta is trapped by a facility that promises to make a cure. Spoiler alert: They didn't. Delta decided to escaped for good, only to meet skeletons three years later.
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Check out the first chapter for background information
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Hello! So you know me by now. If ya haven't already I highly recommend reading Kamisori's story Zombietale. Even if the story and plots are completely different maybe you can get some sense of (a few) of the character's personalities.Zombietale is a really good fic! I love it!
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11/? - First chapter doesn't count(Zombietale belongs to Kamisori)
(Writing belongs to me (Me Paina))
(Drawing belongs to me (Me Paina))
(Undertale belongs to Toby Fox) -
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Killer’s always been good at laughing off the things that should scare him. The liquid hate burning in his sockets? Just part of the deal. The endless missions for Nightmare? Just another day. But lately, something’s wrong. The world blurs at the edges, shapes smear and double, and no matter how hard he tries to clear it, the darkness keeps creeping in.
He can’t let the others see. He can’t slow down. But as his vision fades, so does the fragile line between control and collapse, and in a world built on violence and survival, there’s no room for weakness.
Tags and warnings will be updated as the story develops.
Series
- Part 41 of Undertale Fics
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Darkness was all there was. Until there was a spark of light. This spark manifested itself as a skeleton floating in the dark emptiness. The light had no name, or age, or consciousness. Devoid of life and soul. And so the little skeleton stared at the nothing around it with open eye sockets, uncaring of the inky blankness that was its unformed universe. Until one day an outcode finds the spark, and fans it into a flame.
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I made an Oc a year ago and they have consumed me fully, so if I don't write lore I will implode.
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You Can Hold My Hand If No One's Home by Evans_Multiverse
Fandoms: Undertale (Video Game)
09 Jul 2025
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Nightmare wasn’t at all expecting Dust to confess to him on a random afternoon, and it was odd that Nightmare couldn’t sense it coming. He didn’t believe he harbored the same feelings for Dust, even if he cared deeply for the other. He didn’t think he was ready to date someone so suddenly… So why did he say yes?
And then shenanigans ensue. Shenanigans that might include unpacking your childhood trauma. And also identity crises, it turns out. Maybe more.
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Self proclaimed #1 Dustmare Shipper writes a self indulgence fic of mostly fluff and goofiness
(Summary will probably change, since this one kinda sucks lol)
Title is from Line Without A Hook by Ricky Montgomery
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From the Same Matchstick by Hunnie_Merrigolde, Just1Weirdo
Fandoms: Undertale (Video Game), UTMV | Undertale Multiverse
09 Jul 2025
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What started as a novelty box of cardboard matchsticks quickly became way more than just that, not entirely unlike a forest fire. In a multiverse where everything works just a little differently, there’s bound to be a ripple effect. One primarily consisting of shameless smut and unapologetically gorgeous characters, but a brand new story all the same.
Series
- Part 5 of Saw You in a Dream