|UNDERTALE Oneshots| A Universe of Stories

Reads 150
Votes 6
Parts 2
Time 5m

Reads 150
Votes 6
Parts 2
Time 5m

alternateuniverse angst authorhasnoclue bittybones fanfiction fantasy fluff friends friendship genderneutral oneshots romance shortstories undertale undertaleau universe xreader

A collection of ongoing Undertale Oneshots! From the original game, to a whole wide world of AU's, suggest and read anything!

SUGGESTIONS: Open

Cover image by Captainkeesu on Tumblr.All Rights Reserved

alternateuniverse angst authorhasnoclue bittybones fanfiction fantasy fluff friends friendship genderneutral oneshots romance shortstories undertale undertaleau universe xreader

Table of contents

2 parts

#50bittybones

Content Guidelines

You may also like

Sans Aus x Reader Oneshots (DISCONTINUED) by XxStormassxX

My first oneshot fanfic. This book is discontinued.

SMUT Au sans x reader by LunaNightmare_69

This book will only contain SMUT/LEMONS, if you don't want that then go to my other book. ⚠️I don't own the cover or any of the characters I use!⚠️ i simply am writing fan-fiction.

[Cover by me] Because I don't have patience to write a story, I'm doing oneshots. always open for requests! this will NOT include: smut [romantic] ships this story WILL include Angst fluff platonic friendships If there is any trigger warnings that are needed I will put them in.

☆ the book will include sanscest, undertale ships, and (mostly) xreader oneshots. ☆ might accept requests soon! ☆ will NOT be doing incest, OCs, ships I heavily dislike, abusive relationships, etc. ☆ updates whenever I feel like it. ♡ please do check out my other undertale books I put up !!! ♡ if one particular oneshot becomes popular, i might put an actual book for it. ♡ low caps is for aesthetic purposes, but only for the title.

[DISCONTINUED] Undertale AUs x reader by SENIZISE

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

"𝘐 𝘓𝘰𝘷𝘦 𝘠𝘰𝘶" skephalo oneshots • discontinued by JayleeTaiyaki

I made the cover! PARTS GET BETTER AS I CONTINUE!! Every part takes me 3-7 days or more (mainly because i wanna write ones with 1000+ words, or i might just do a 100-500 word one once in a while - Fluff (mostly this) - Just them being friends - Angst - A mix of fluff and angst - Will add more as I write more Some oneshots of them just being friends, but will do actual romance stuff aaa idk what this is, anyways hope we can be friends! I will put a tw or cw if needed! (basically a warning thing) I will do requests! Yeah thats it ✔︎

Just oneshots. A decent portion of them can also be found on AO3, under the same username/psueds. I changed the cover 3/24/22. Fandoms included: Undertale (DISCONTINUED!) Octonauts YouTubers (DISCONTINUED.) Team Umi Zoomi Transformers (Main.) Requests are not open.

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!

What the title says. Mostly about Error, because I cannot stop thinking about ideas regarding him... Either way! One shots! There will of course, be one shots about others, not just Error. Uh- ships are mostly after death and destructive death, but if there are any recommended ships I will gladly try some of them out! Ships (if there are any) should be written at the top of each oneshot, if there are no ships in it, it should say "No ships." Any pictures or art used in this book do not belong to me. Nor does the cover art. *cough* UnderTale belongs to Toby Fox. I don't know why I'm doing this- help- Also. Personal favorite is the Encased in Glass one shot.

Error's book of angst and fluff (finished) by Leffee

Please for goodness heavens, don't comment if you're really young, I had to delete enough of cringy comments. Also please don't leave any suggestive comments, there's a reason why this book doesn't have lemons (aka I'm sex repulsed). Just some one-shots about Error!Sans. Mostly fluff and some angst. Basically me throwing here whatever comes to my mind. Error is short, not because I said so, but because it's canon. In some chapters ships are directly shown, while in others they're not. If that's the case then they're probably friends, but there's nothing stopping you from seeing them as a ship. (Cover belongs to yufy01 on tumblr)

Sans Aus x Reader Oneshots (DISCONTINUED)

My first oneshot fanfic. This book is discontinued.

More details