undertale + AU's
16 stories
A Sansational time. (AU sans's X reader) by Mistress_Narcleto
Mistress_Narcleto
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    Parts 17
Many sans's band together to save the timelines from genocide, with help from a human named (Y/N) little do they know that tHeYRE BeIng DEstROyed fROM thE InSidE.
AU Sans X Reader one-shots by _PleaseDontGo_
_PleaseDontGo_
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    Parts 14
Want to be in a one-shot with the sans of your choice? Well you came to the right place!!! Just comment down below in one of the one-shots!!! Enjoy!!!!
A Hoarder of Secrets by trashofundertale
trashofundertale
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    Parts 11
When Dad's away, the kids must play. With the newest addition to the family questioning everything about his new master, Mint takes on the harsh journey of finding out the answers to the skelekids repeated questions. Unfortunately, Mint isn't going alone. • Cover Art by hollycowidontknowmyname on Instagram
Abandoned Past by trashofundertale
trashofundertale
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    Parts 21
There is forever speculation as to where the skelekids' creator came from and it is uncertain whether he even knows himself. But when Daddy Sans starts zoning into old memories both pleasant and vile, will he be willing to go back and return to what he ran from? Or will he discover something darker?
... by tmntloverforlife2015
tmntloverforlife2015
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    Parts 1
All's Fair In Love And War Gaster!Sans X Reader by Emblem_of_Homestuck
Emblem_of_Homestuck
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    Parts 8
War amongst the humans and monsters has really messed things up for you. That is, until you meet a sexy skeleton. ((Note: this is a slow burn. You actually have the chance to fall in love instead of usual fanfic logic. Also reader is gender neutral))
**COMPLETED**Finding Family(Underfell AU) by temoamelia
temoamelia
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    Parts 35
An Underfell fanfic. Can Frisk make it out of the Underground alive, and find what she was looking for? **COMPLETED 12/30/16**
I Will Protect You.. No Matter What. by _Undertalee_
_Undertalee_
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    Parts 19
Sans had just gotten over the loss of frisk when another human falls down. Sans is shocked. He decides to protect the child no matter what. That's what frisk would have wanted.
Nightmare (An Undertale Fanfiction) by LucyTheDragonslayer
LucyTheDragonslayer
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In a world where only the strong survive, there is me. I'm not strong, or a survivor, but I'm still here. My parents have kept me hidden from the world, never letting me leave the house. My parents aren't cruel people, they keep me hidden to keep me safe. They have always loved me. Until one day when I ask to go outside. Something inside them snapped and they beat me. That was my first punishment, one of many. It's been years since then and I've finally escaped. Of course I was caught, but I had a moment of freedom. I, however, am no longer wanted after my stunt, and are taken on a camping trip. On this trip, my parents pushed me into a gapping hole in the ground. I fell into the Underground. Where will my life go from here? ____________________________________ This is a reader insert, but I will try my best to avoid using (y/n) and the likes. All the Sans-es (except Underswap!Sans) are evil-ish. Loli!Reader, Innocent!Reader, Abused!Reader, Undertale!Sans, Underfell!Sans, Underswap!Sans, Gaster!Sans. ____________________________________
Undertale X Reader by Frei_111
Frei_111
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    Parts 39
You woke up on bed of golden flowers without having anything to remember. Going to an adventure where you met with many monsters to go home. Easy, right? Not really, actually but anyways! - I do not own any characters from undertale -i did this only for fun, don't judge me -this story is abit (alot) angsty so be prepared~ -Chara is evil(sorry i just had to-)