*Writing these oneshots fills you with Determination (Undertale AU Oneshots)

Reads 16,479
Votes 258
Parts 24
Time 1h 11m

Reads 16,479
Votes 258
Parts 24
Time 1h 11m

frisk oneshot underground undertale undertaleau xreader

Undertale AU Oneshots 

AU's included (Most common):
Undertale 
Underfell
Underswap
Others

Frisk picture by Yatsunote on DeviantArt
Layered pictures by Brujitzu on CanvaAll Rights Reserved

frisk oneshot underground undertale undertaleau xreader

Table of contents

24 parts

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Underswap love [complete] by Author-Dayo

this is a love story between swap sans and the reader, the reader falls runs threw MT.Ebott trying to escape her twisted guardians when she is shot into a massive hole. Lost and hurt in an unknown place she is saved by a kind man who takes her in and treats her like family. Obtaining powers and learning about herself in the underground she uses them for good and helps get everyone out. Determined to help the people she Loves and holding onto her Hope she fights to survive and free everyone. this is my 1st Undertale fanfic and I wanted to start with underswap~ (if I get some things mixed up I'm sorry)

New Family (Undertale au's x OC) by Juniperlives43

*Not completed (on Haitus with this one) just trying to prevent wattpad from deleting it* A teenage hero has fell down into the underground known as undertale. She is injured and stays away from the monsters that live underground for their own protection... because she is being chased. *give credit to all artists for the cover and any art I use in this. Great work! And the au sans belong to their rightful owners*

An Undertale AU i created... All the characters are overly aggressive(except Flowey) and try to kill every human they see. the last human to fall into the underground is Frisk, and they meet many monsters who initially try to kill them, until Frisk teaches them the benefits of being nice. this takes at the same time as Undertale, but is completely different. it is also similar to horrortale because that is the AU that inspired me. all the characters belong to toby fox The cover art was created by RenSabre

Undertale/Au's x reader. by Broken-fnaf-fan

I don't own the cover, or any of the art in this unless I say so. Here's some fluffy one shots. No lemons you sinners, most of the readers will be female sorry guys. Mostly is sans Au's or papyrus Au's.

UnderTale Universe One-shots by aholmes405

HEY GUYS!!!! This is a book of one-shots obviously.This will have one-shots of all different universes. (underfell, underswap, undertale, etc.) I am taking requests and would love to do anything that makes you guys happy! Credit goes to the respectful artists.

UnderTale Oneshots (FINISHED) by TheGrinningKitten

(I DO NOT WRITE ABOUT UNDERTALE ANYMORE SO PLEASE DON'T REQUEST ON MY CHAPTERS) (AND FOR THE LOVE OF GOD STOP COMMENTING ABOUT MY GRAMMAR, I AM SWEDISH AND I HAD A HARD TIME LEARNING THE ENGLISH GRAMMAR. I'M MUCH BETTER AT ENGLISH NOW) This is my oneshots of UnderTale. It invloes AU'S to! Background picture by Casper-Cat on Tumblr, editing by me, and editing program is called covercreator.net. Mostly X reader

*Writing these oneshots fills you with Determination 2 (Undertale AU Oneshots) by Brujitzu

And we're back! I need to write something or I'll go insane during this quarantine stuff. Y'all know what this is, so I won't waste your time explaining it lol AU's: Undertale Underswap Underfell Others Sans, Pap, and Frisk drawing by izudraws on Tumblr Layered pictures by Brujitzu via Canva

[REQUESTS CLOSED] Undertale AUs x reader by Th3s1ll13stb00

Just some Undertale and AUs x reader for funsies <3 Happy 2025!!

The determination to love [Sans x Frisk] by nomilyCaisse

Frisk, after passing multiple years with Toriel, decided to explore the Underground. After befriending every monster, they soon arrive in the judgment hall. What will happen in there? There are currently 3 one-shots (well one one-shot and one two-shot) Enjoy! Cover by: @RyuzakiManga (Thank you again ^o^)

AU! Sanses x Reader Oneshots! (DISCONTINUED) by milkeco

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!

Underswap love [complete]

this is a love story between swap sans and the reader, the reader falls runs threw MT.Ebott trying to escape her twisted guardians when she is shot into a massive hole. Lost and hurt in an unknown place she is saved by a kind man who takes her in and treats her like family. Obtaining powers and learning about herself in the underground she uses them for good and helps get everyone out. Determined to help the people she Loves and holding onto her Hope she fights to survive and free everyone. this is my 1st Undertale fanfic and I wanted to start with underswap~ (if I get some things mixed up I'm sorry)

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