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9 stories
Sans' House Guests (CreepyPasta x Undertale) by BubblyShip
BubblyShip
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    Parts 27
The surface was not what Sans thought it would be. Lack of communication skills, communication in general, and social interaction had driven him into a depressed and anxious state of loneliness so deep that it'd take a gang of serial killers to help drag him out and fix his problems. Literally, it took a gang of murderers called CreepyPasta just to set things right. The world acts in funny ways. (REWRITE IN PROGRESS - Be warned, this story is old and is not properly written to handle certain topics regarding mental health.)
Sans meets MHA by _x_x_x_yo_x_x_x_
_x_x_x_yo_x_x_x_
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    Parts 23
Sans was sleeping until a portal sucked him onto what looked like... A classroom? Sans learns that humans here have magic, but can they beat Sans? A.N. Art and characters are not mine. Only my OC and cover is mine.
Brothers (A Sander Sides x Undertale Crossover) by Popculturewolf
Popculturewolf
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    Parts 7
Brothers. That's what they were. Virgil and Sans were brothers, and, technically, still are. Sans became a skeleton when he fell down Mt. Ebott. Virgil became a side when he committed suicide because he was alone, believing his older brother died. So what happens when they meet again? And what happens when Sans visits Virgil, and the other sides find out? What happens when the AUs follow Classic, who's been disappearing recently? Ships: Virgil x Roman Classic x Error
The Punny Hero, Sans! (Undertale bnha Crossover) by Lbartl01
Lbartl01
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    Parts 7
Boku no Hero Acedemia but with a couple Undertale characters
Undertale x Bnha Crossover (Being rewritten in another book) by CheapClown
CheapClown
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    Parts 22
Classic finds himself in a new place after another RESET, later on meeting up with Red. They become friends with new people and eventually meet up some familiar faces. Will they get back to their world or will they perish in the process? !WARNING! -Cursing/Bad words -Disclaimer- None of the art or videos are mine unless I say it is. Undertale and BNHA belong to their rightful owners. Same with the AUs. (Sorry, I suck at descriptions. Slow updates)
The misplaced judge ( Undertale x bnha ) by 1Random-Person1
1Random-Person1
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    Parts 9
Sans was taken from his world and placed somewhere else due to the resets that the player has been doing. This place is "My hero academia". But San's code glitches and turned him into a human girl. What will sans do now? This story is my first, so please don't have high expectations.
The Skeletal Hero: Karmic Judge by A_Toast1
A_Toast1
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Complete! The player has just finished fighting sans and has left him to die. As sans turns to dust he sees a flash of light before everything goes black. He then wakes in a new world. Note: I don't own undertale bnha or the character in it nor do I own any of the art in this, this is just a fan fic that I decided to make.
"What's a quirk?" (Undertale x BNHA Crossover) (BEING REWRITTEN) by Popculturewolf
Popculturewolf
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    Parts 27
Warning: This is my first story, so it might be bad! I hope not... Sans was fighting the kid again. How many times had he seen his friends die? His BROTHER die? He didn't know anymore. He had stopped counting a while ago. He was starting to get tired from fighting the kid. He started to fall asleep. 99999999999999 "Guess that's it, huh? Don't say I didn't warn you..." "Welp, I'm going to Grillby's. Want anything Papyrus?" He woke up on the... surface? He was in an alleyway. He didn't know what would be coming to face him in this new world, filled with 'quirks'. #155 in Sans as of 8/25/2020 #221 in Undertale as of 8/19/2020 #704 in Crossover as of 8/25/2020
Flowers and Thorns by iLikeMangoes2000
iLikeMangoes2000
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in the past a mighty kingdom existed, filled with both rich and poor, wise and fools, positivity and negativity. Yes they were in perfect harmony. Until people started complaining. Rich complained about the poor and were absolutely disgusted, the fools started to get jealous about the wise who has absolute knowledge, people started feeling inequality towards others and so they started war against each other. Soon enough they divided the land into two, and soon became and known as the castle of flowers and the castle of thorns. Let's see what will happen next................. ( this is a fan fiction about undertale and the other AUs) Image above is made by me