Undertale
9 stories
Told You I Wasn't by Firehedgehog
Firehedgehog
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Error never said he was a Sans, he was a glitch. But he had a secret, and Inks latest 'plan' just released it to the multiverse. Fate swore, Destiny Laughs. Adopted from @MoonAndStarsAlign from Fanficion Ideas 'Error!Sa-WHAT!?? ' Enjoy
Error X Nightmare  by ErrormareProxies
ErrormareProxies
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Error gets hurt and does not remember what happened to him. Why did Nightmare save him?
Life in dreamswap! by Shippings4Dayz
Shippings4Dayz
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What will happen in a normal day of dreamswap? who knows?? !cover not by me!
A Little Bonely (Sans X Reader) by UltimateUndertrash
UltimateUndertrash
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Monsters always fasinated you. Ever since Frisk broke the barrier and freed the monsters, humanity didnt take it too well but they are slowly getting used to it. Slowly. Very...slowly. (btw Chara is depicted as a female in this story, and so is frisk. Dun be triggy) HEY ALL! This is my first fanfiction EVER! so dont judge. [NC 16] at some parts :>
Au sans x reader oneshots  by Angelcandy321
Angelcandy321
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well I was bored, and I love Undertale so it kinda makes sense.
At the Surface (Sans X Reader) by mswordyq
mswordyq
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The monsters have finally made it to the surface and have been legalized to roam the surface as they please. The first couple of months have been spent as a paradise where humans and monsters have lived in peace and happiness. But as we all know, humans tend to be afraid of what they don't understand and the appearance of the monsters only seemed to have fueled the rising tension. You are a member of one of the biggest clubs that support the monster's appearance, known as the FMC (For Monsters Corporation). There is a rival club, known as the DM (Destroy the Monsters) that only wants to exterminate the existence of the monsters, and with every passing day, conditions only seem to be getting worse. Determined, you try to make things right and equal for all beings, but things start to alter when you meet with a certain skeleton. And with this certain skeleton, you, dear reader, reveal your biggest, most valuable secret...your little "defect". •°•°•°•°•°•°•°•°•°•°•°•°•°•°•°• COVER ART IS NOT MINE, I ONLY EDITED IT OUT FOR MY COVER. UNDERTALE DOES NOT BELONG TO ME, IT BELONGS TO TOBY FOX. I am simply writing this for the sake of my imagination, as well as for the entertainment of others. Thank you.
Divided [ Sans X Reader ] by morrow-
morrow-
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Almost four years marking the anniversary of monster kind reaching the surface, the human ambassador Frisk goes missing. Severing the link between the two species, an all out war breaks between humans and monsters. After bloodshed on both sides, monsters emerge victorious. Yet somehow a miraculous town in San Francisco has evaded the warfare and even has an orderly society. And despite everything, Sans keeps encountering a girl who has saved his life one too many times. When your fate and Sans' intertwine, it becomes apparent that the relationship between the two of you extend beyond this timeline. You are plagued with memories of a distant life and Sans begins to hallucinate visions of a not so distant past. Insanity seems to be eating away at the two of you and it's only a matter of time before someone cracks.
The Silver Soul by EffieTrinket1619
EffieTrinket1619
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    Parts 45
A girl with a strange soul lands in the Underground, with no memory of her life. Who is she, and what is her story?
Corruption (OLD) by ParadoxicStars
ParadoxicStars
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You died. Again. But, when you woke up... You were back at the beginning. You didn't reset... but something was off. Flowey seemed skittish, frightened even. He was KIND. The people you knew, you once held dear... CHANGED. The entire underground was different... Dark. Nobody seemed to recognize you, but a part of them still remained. Someone who just wanted a friend, to be looked up to, respected... And another who just wanted hope-who was tired of this game... You're left with two choices: Will you kill to survive, or will you die befriending them all over again? Authors Note: This is in the AU Underfell. I recommend looking into it, it's simply amazing to me! Long story short, the "you" mentioned there is Frisk but it was a good description for the AU I found once. This is basically, somewhere the save file got corrupted, and now everything is reversed except Frisk. Hope you enjoy! Disclaimer: I do not own Undertale.