Undertale Fanfic Library
This is a collection of undertale fanfiction for readers who are tired of all of the slog in the normal search area... mainly all the romance fics that have sans dating another sans. All of these fics are recommended from the community and are currently being reviewed. Reviewed fics have bookmarker notes.
This collection is made up of fics that where enjoyable to read, or reccomended from others.
Do note that some fics here have 'wierd' fics (EX: Sans/Toriel/Undertale-Player), HOWEVER: either its a mistag, or something so minor it's just a paragraph to be skipped. These tend to have reviews by me so read them.
(tldr: basic quality control here)
Custom bookmark tags for searching:
0-1000 - Word count from 0 to 1,000
1001-10000 - Word count from 1,001 to 10,000
10001-100000 - Word count from 10,001 to 100,000
1001+ - Word count greater than 1,000 words
10001+ - Word count greater than 10,000 words
100001+ - Word count greater than 100,000 words
Series - Work a series
Sansfic - Work revolves around Sans
Comic - Work is a comic
Tags Last updated 06/06/2024
(Open, Moderated)
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Summary
For Monsterkind, the Surface represented freedom.
For Frisk, it's a return to some uncomfortable realities.
It all began with a simple wish. When that wish faded, Frisk tried to move on.
Except, 'moving on' was not so simple. Emerging from the Underground had put them in a worldwide spotlight.
From an unknown child, they had become an icon of great value.'The Golden Quiche'
What to expect from this story:
-Mystery Drama
-Anime
-Extensive Surface Worldbuilding
-Expanded History and Backstory
-Magic System
-More Magic
-Both new and old people.
-Feels.
-Gambits.What to not expect from this story:
-Toby Canon.
-Commonly agreed headcanons
-Slice of life. This is definitely not that.The Magus Compendium lorebook
Quiche Side Stories
My Links
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Summary
December 25, 2015
Mysterious black briars destroyed the whole of Ebott. Every inhabitant was lost except for a pair of brothers. Not long after, a tragedy claimed the younger one.
Since then, the sole survivor did everything he could to prevent the calamity from spreading further.
This story will use the following three premises:
- Soulless Post Pacifist
- Post Apocalypse
- Modern FantasyThis work is distinctly not the regular Dust Tale. It is an AU that strives to create a similar result using a path vastly different from the original. If you're looking for the true original, please go to their Tumblr blog at http://ask-dusttale.tumblr.com
Series
- Part 3 of Golden Side Orders
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BRINGING DAWN - An Undertale and Fire Emblem: Three Houses crossover by Hello_I_Exist
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses, Undertale (Video Game)
06 Aug 2025
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Summary
Instead of fleeing to Remire village after Kostas attacks their 'Bonding camping trip,' our three favorite lords make their way to the foot of Mt. Ebott- a small mountain in the aptly named 'Ebott' region.
Things, predictably, do not go to plan, and in the process of their escape attempt, the trio find their way into a familiar cave with a familiar hole in the ground.
Faced with a whole new world of Monsters and Souls, Edelgard, Dimitri, and Claude must find a way back to the surface they call home... But things won't be quite that simple.
A murderous and manipulative flower, a barrier sealing a whole race underground, and a mysterious voice calling for consequences to be done- Yet despite everything, so long as they hold the strength to continue, nothing shall stand in their way.
...Right?
*Greetings.
(No Undertale knowledge is required in order to read this fic)
{v2.16 Update: ON HIATUS.}
Series
- Part 2 of Bringing Dawn
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Summary
Dream stared at the endless white and shuddered against how oppressive this place was.
His eye lights focused on the only thing here.
There was a skeleton on the ground with his hands over where his ears would be. Most of the skeleton had turned dark with glitches and the occasional error but part of his face and some of his left arm and torso was still white. He wore the typical Sans hoodie but with different colours and red glasses.
He was muttering to himself.
"Are you okay?"
A.k.a: What if Dream had met Error before he completely went crazy?
(This fic is inspired by For the Forgotten Ones.)
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Glitchtale Rewrite, Book 3. by The_One_Aaron_1
Fandoms: Undertale (Video Game), Glitchtale - Fandom
05 Apr 2025
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Summary
Edit: (12/26/2024)
I lied
book 4 is on
but it might take a pretty long while. I might not post any of it until I'm a dozen or two chapters into making it.Edit: (4/18/2025)
Book 3 has been submitted in full. I hope Y'all enjoy.Book 4 really IS gonna take a while though. Sorry.
Series
- Part 6 of A Glitchtale Rewrite
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Summary
"It has already been used several times."
- Info text for the BandageBookmarked by learchiveoftheut
25 Jan 2026
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Bookmarker's Notes
[finished reading as of 01/24/2025]
Two messed up kids care for eachother in their own way.Great work, stars the characterization, there’s layers and I wish I could write that well
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Summary
Helen had everything she wanted until monsters trespassed onto her precious Overridge Academy. She was determined to keep the PTA free of them as well, but her problems double when a literal skeleton starts attending the meetings...
- Language:
- English
- Words:
- 30,126
- Chapters:
- 7/7
- Comments:
- 525
- Kudos:
- 2,938
- Bookmarks:
- 513
- Hits:
- 32,095
Bookmarked by learchiveoftheut
24 Jan 2026
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[finished reading as of 01/26/2026]
Linda, a Karen, runs a schools PTA meaning. She doesn’t like monsters, cue sans. She suffers the consequences of her own actions and does have development.Pretty nice and self contained fic, my only dislikes are just Linda bashing but that gets fixed very quickly.
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Bonus Content by SpectrumWriting
Fandoms: Undertale (Video Game), Deltarune (Video Game)
05 Feb 2026
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Summary
Something has gone wrong.
Ten years into their happy ending, Frisk wakes up back in the Underground with no memory of reseting.
A few hours after parting ways for the night, Kris and Susie wake up in a strange new Dark World... again.Frisk's save file has been corrupted. Kris's soul isn't behaving how its supposed to. And Ralsei shouldn't be here at all.
An epilogue and a story half-told can't coexist without some conflict involved.Bookmarked by Wrxt
12 Oct 2025
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[Finished reading ch 4 - max chapter at the time - as of 10/11/2025]
something’s gone wrong, A reset occurred and Frisk is back in the underground after 10 years.
Kris and co find themselves in the underground
What I like about this fic is it’s exactly what it says, starts off with Frisk being really confused when a reset happened.
Honestly my favorite part is Frisk here, ie having to deal with suddenly being 12 again.
Kris and co are also fun with the misunderstandings piling up.
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Strawberry Rhubarb Pie by Master_Spoiler
Fandom Deltarune (Video Game), Undertale (Video Game)
15 Sep 2025
- Words:
- 8,379
- Works:
- 2
- Bookmarks:
- 5
Bookmarked by Wrxt
16 Sep 2025
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[Finished reading work 2 ch 1, max chapter and work at the time, as of 09/16/2025]
Undertale player reconnects with he world 9 and 10 years later. And chats.
Slice of life-ish, no disasters, no mental breakdowns, just talking. Character interaction of a Player and the inhabitants. I like it for that. Great series.
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Summary
It's been ten years, of this. Someone finally decides to quit.
Bookmarked by Wrxt
16 Sep 2025
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[finished reading as of 09/16/2025]
The player does one last genocide run before moving on from the world, it’s been 10 years and they’ve changed.
Not so hard on the angist which I like, it’s short, sweet, and to the point.