Undertale
98 stories
wanna have a bad time?  by Frostygamer234
Frostygamer234
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Frisk and Sans are tired of the resets and try to form a plan to stop Chara and Flowey. Sans learns just how much he loves Frisk, like his own kid and soon becomes her protecter and her best freind. Everyone soon learns not to mess with Sans' kid. Or there gonna have a bad time... (Sans does love frisk but like a Daughter or a Family member. This is not a sans × Frisk fanfiction. Also Frisk is a girl)
Sans In Hazbin Hotel AU by Dabisteven
Dabisteven
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After witnessing countless Genocide Routes across endless timelines, Sans finally breaks. Convinced that humanity is beyond redemption, he abandons everything he once stood for. By embracing LOVE and accumulating EXP, Sans transforms himself into the very monster he once warned others about. After reaching LV 20, he exterminates the entire Underground, defeats Omega Flowey to end the possibility of Resets, and wins a cataclysmic final battle against a Determination-fueled Frisk-a battle so devastating that it ends with the destruction of the Solar System. Believing he has finally erased humanity forever, Sans dies in peace. ...Only to awaken in Hell. Instead of eternal punishment, he finds a city overflowing with laughter, greed, violence, and indulgence. Humanity still exists as Sinners, seemingly free from the consequences of their actions. To Sans, Hell has failed its one purpose. If Hell won't judge humanity... He will. Armed with soul-destroying magic capable of permanently erasing Sinners, Sans begins a ruthless crusade through Pentagram City, becoming one of the most feared beings in Hell. While Princess Charlie Morningstar fights to redeem lost souls, Sans believes redemption is nothing more than a lie told to monsters and sinners alike. As mysterious disappearances spread across the Pride Ring and powerful Overlords begin vanishing without a trace, Charlie and the Hazbin Hotel are forced to confront a terrifying truth: This isn't just another Sinner. This is a broken judge from another universe who has declared war on humanity itself. Caught between redemption and retribution, hope and hatred, Charlie must find a way to save the one soul who no longer believes anyone deserves saving... before his twisted sense of justice plunges all of Hell into chaos. Because everyone gets judged... And in Hell, Sans has become the judge, jury, and executioner.
Karmic Judge Rebooted by A_Toast1
A_Toast1
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The genocides never seemed to end, until they did. Something happened, something that threw Sans into another world where he must adapt. All while trying to stop a killer and save his family and friends. Here is the rewritten version of my first story. This fic contains swearwords, violence, blood, death, intrusive thoughts, murder/ attempted murder, If you are sensitive to this sort of thing then I recommend you proceed with caution. *I do not own Undertale or Bnha in any way. *The cover art is drawn by me.
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.
Welcome to the Future  by SpiritWolfNura
SpiritWolfNura
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For 130+ years, monsters have been extinct with the only things left behind having been their hybrid children. Over the years as the hybrids continued to reproduce and 80% of the world's population went from human to superhuman. With the rise of superhumans came the rise of heroes and villains. AU High. Japan's #1 hero school. A place that produces Japan's finest heroes. A place that hides that last of monsterkind.
Humerous Temptations - DarkHumor (Nightmare x Classic) by Celestial_Keeper
Celestial_Keeper
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Life always has a way of keeping one on the path of their destiny. For Classic, he was lazy. He was often alone. He simply enjoyed his cozy life with few responsibilities. Yet the world found a way to tamper with that. A single incident offers changes that may give him what he's lacked for so long. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Cover was drawn by @MiMaidide
Remembrance - An Undertale Story-DISCONTNUED by MEJ2235
MEJ2235
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Long ago, two races ruled over the Earth. Humans and monsters. At least, that's the story we all know. There was another race. Technically, they were monsters. Skeleton monsters to be exact. Humans shunned them because they were monsters. Monsters shunned them because humans had skeletons. In retaliation, the skeletons split into two different races. The Surface Skeletons and the Abyss Skeletons. The Surface Skeletons reaches out to both monsters and humans. However, when the war started, they were some of the first monsters attacked and many were killed when they fought with the other monsters. Only a handful were sealed underground but without the Sun to strengthen their bones, the skeletons suffered until they received anonymous help. Very few survived to this point and slowly, they died out. The Royal Scientist at the time and his wife tried to have children. Each time left them severely weakened. Each child dusted until the wife gave up her life to bring a great skeleton into the world. That child is the last of his kind. The Abyss Skeletons shunned all other monsters and humans, considered them all demons. Their society was alike human society long ago. Divided. They believe they are strong and emotions only weaken. The class system was rigid and they possessed a kill or be killed attitude to all other monsters and humans. They thrived underground and ended up building their society in the Underground's own Abyss. It is a shame that only their leader can reclaim their heir from the corruption caused by those demons. Warning: Rated Mature for possible smut and probable gore. I'm sorry I don't know what I'm doing but this ain't for little kids. Also, cover doesn't belong to me. Credit to creator. Found it randomly when I searched up Undertale.
FurtherDown by THEANIMATEDFOX4
THEANIMATEDFOX4
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Was this truly the last RESET? Sans wondered. But he knew only Frisk would tell, only this young girl would decide his future. He hated the thought of it at first, but hatred began to grow numb after he figured out he had no say in his own future. He had to admit though, Frisk was pretty reasonable, it was Chara who was the maniac. But she was gone now, so what was the anticipating, eerie, feeling that he had in his bones? The feeling that something wasn't right, of course, this timeline was already incredibly strange. The feeling sat in his in the pit of his stomach, tying itself into knots, until that fateful rainy day when all of his questions would be answered. So basically, this is a fanfiction of a fancomic of the game Undertale. Look, I'm gonna admit, I'm little stuck in the Undertale fandom, so this is my of slowly crawling out of it. Anywho, I strongly suggest you read the fancomic which this fanfiction is based off of, DeeperDown, before reading my story. Here, I'll give you a link. http://gettingdeeperdownwithundertale.blogspot.com/ Anyway, enjoy the story, it took me about 11 months to write, so please consider enjoying it, seriously. - Ya Boi, Fox
Haremtale || Classic Sans x AUs || by Banaanaa_Miilk
Banaanaa_Miilk
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Classic Sans incidentally finds himself working as a maid for eleven different skeletons in a mansion, after accidentally breaking a statue worth millions of dollars. What he doesn't yet realize is that all these skeletons begin to quickly crush on him, and some of them don't like to share. || Reverse-harem where eleven AU Sanses are crushing on Classic! || ***Artwork is not by me!!
He Came to Stay (Blue x Bad Guys) by EmberAshTheFaithful
EmberAshTheFaithful
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Living on a steady diet of caffeine, sugar, and sheer will is not a healthy lifestyle. But how else can you keep up with teammates that need no sleep, no food, and who expect the same of you? Blue has no intention of falling behind, ever, for any reason. But his lifestyle is starting to show to others. What happens when the enemy intervenes for good?