Undertale AU's random stories
- Reads 74
- Votes 0
- Parts 9
Ongoing30m
Last published Fri, Feb 6, 2026
So this is my own AU about the Undertale Multiverse. And every story is about a random thing that the Star Sans and Bad Sans do random things and things get even weirder and weirder. As cringe as it sounds, just that it will make you laugh.
All Rights Reserved
Join the largest storytelling communityGet personalized story recommendations, save your favourites to your library, and comment and vote to grow your community.
You may also like
![[DISCONTINUED] Undertale AUs x reader](https://img.wattpad.com/cover/346707534-256-k297342.jpg)
[DISCONTINUED] Undertale AUs x reader
Just some Undertale and AUs x reader for funsies <3 Happy 2025!!Complete
ˣ𝓘 𝓬𝓪𝓷𝓽 𝓱𝓮𝓵𝓹 𝓱𝓸𝔀 𝓘 𝓯𝓮𝓮𝓵!ˣ nightkiller (Discontinued)
This is my first sans au story! So it might be a bit... cringe.. ANYWAY- warnings: •mentions of self harm •lemons (sexual stuff) •mentions of rape or sexual assault •abuse So killer has a crush on nightmare, but doesn't feel as though nightmare like killer, but everything changes once killer starts to get sexually harassed when spying on the star sans, and nightmare notices it.. sometime and helps killer also I don't own the cover #1 in Sansaus!! (September 24 2022) #2 In dross ! (September 24 2022)Complete
AU! Sanses x Reader Oneshots! (DISCONTINUED)
Cover by @sergeantmisos on Twitter. Likely not to be updated for at least a few years. So sorry <3 undertale and its aus aren't really something I'm fixated on anymore!Complete
Fallen (ErrorInk)
I dunno wut im doing, sorry if its bad ;~; Some Background: Most alternate sanses are attending a highschool, call the school whatever you like. This takes place in an AU thats not really an AU, seeing as there are no undertale characters. There is a "Gang" in this school, it is comprised of Nightmare, Error, Cross, Killer, Horror, and Dust. Everyone is afraid of them, except for the Star Sanses. Eventually, one of the star sanses, Ink, is able to befriend one of the bad guys, Error. Error starts to develop feelings for the artist, but, when something bad happens to Ink, error wonders if he'll ever get a chance. {This is an extremely slow-burn! You have been warned.}Complete
Life in a forest ( Au sanses x reader x au papyruses )
An au sanses x MONSTER reader x au papyruses? Papyri? A fanfiction, it is not self-indulgent. So if your just lookin for some fanfiction to put yourself in, here it is. :)Complete
Yandere!Error!Sans x Female!Reader x Yandere!Nightmare!Sans
Geez I just can't stop making yandere sans fanfics- (Also I know the cover looks cringy but s h u s h) Just enjoy the book lolComplete
{ Chara x Papyrus }
[There aren't a lot of stories that I've seen about this ship... And since I ship Sans x Frisk, it seemed appropriate for my tastes. If you don't ship it (Like you Mettaton x Papyrus fans) then don't read it!] Thank you~ Edit: This is incredibly old and cringy so read at your own risk XDComplete
Moonscar/ myth!verse ( undertale multiverse )
this is a multiverse that ive been working on for years. its finally being wrote by me for fun . please enjoy and dont steal my designs for the sanses as humans/ creatures please and thank you! moonscar island is home to not only some lovely and charming lasses but also to a horrible curse that causes menacing beasts to show up on the island at night. nobody knows who these creatures are or why the moonscar curse has caused such a event... it is ur turn to attempt to figure this out along with a crew of pirates and the lovely lasses that live on moonscar. find out about moonscar's history to figure out the secrets of this mysterious island. eventually more main characters will be listed as i continue the story of moonscar.Complete
Just some Undertale and AUs x reader for funsies <3 Happy 2025!!
More detailsContent Guidelines