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A small collection of my ideas for some Undertale AUs!
Got this idea to make a collection of them on Ao3 from Chibi Chat! Finally can have a place to let all my little thoughts be in one place!
-First chapter (Leviathantale X Mute! Cross Au)
- may have more to come- Language:
- English
- Words:
- 1,120
- Chapters:
- 1/?
- Collections:
- 1
- Hits:
- 0
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First Fallen, Not Forsaken by Your_Average_Spirit_Guardian
Fandoms: Undertale (Video Game)
21 May 2026
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A hundred years after dying, Chara wakes to a world that has already learned how to live without them.
The Dreemurrs, Frisk, and the people around them try to make room anyway. But for Chara, kindness feels unbearable, safety feels stolen, and survival is not the same thing as wanting to stay.
UPDATES EVERY TUESDAY & THURSDAY!
Series
- Part 29 of The Gentleverse
- Part 1 of The Gentleverse – Undertale Branch
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An Angel's Fall by ASTMVN
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
21 May 2026
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The second chapter of To Clip An Angel's Wings, and the first chapter of the Susoul route. El wakes up in the aftermath of their breakdown, finding that the world - and a particularly stubborn dragon - have no plans to let them go just yet.
Series
- Part 2 of To Clip An Angel's Wings
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Twenty years ago, the monsters were sealed underground again for reasons hidden from ordinary humans. Twenty years later, two girls explore Mount Ebbot, looking for their missing friends. They stumble upon the hole to the underground, and.....well..........I invite you to follow them
Series
- Part 1 of Monsterfall
- Language:
- English
- Words:
- 1,837
- Chapters:
- 4/21
- Hits:
- 18
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Summary
Sura is Just your average, run-of-the-mill teenage human. Because nothing says “normal” like a family that’s totally not dysfunctional. Then, in a shocking twist , he gets stabbed in an alleyway and poof- turns into Sans. Because why not? And of course, Error just happens to crash into him. And everyone’s thinks they are lovers like it’s a rom-com.
Fun? Oh, absolutely. (Definitely not sarcasm)(Update Every Wednesday)
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Crazy
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What if… Frisk was able to see spirits? Specifically, the fallen humans.
In which, Frisk sees ghosts, and those ghosts help them through their adventures in the Underground. Except that only one of them can be with them at the same time (not Chara, they have the power of the popular side-character).
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“那么，请您救救我吧？”
- Language:
- 中文-普通话 國語
- Words:
- 2,019
- Chapters:
- 1/1
- Kudos:
- 2
- Hits:
- 18
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tibia honest with you... by lavenderlorespeaker for Imrollindownthehill
Fandoms: DCU, DCU (Comics), Undertale (Video Game), Justice League - All Media Types
21 May 2026
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After a sudden mishap with the CORE, Sans end up getting stuck in the DC Universe.
Somehow, throughout all of that mess, he stumbled his way upon dating a man known as The Nightwing. He's not complaining about that, he is just wondering if there's a way home after all... And if there is, will people still remember him after all.
Two years later, Frisk would answer that question by landing in the exact same place that he did, right in the Justice League Watchtower.
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Blue is a mortal with 1HP. He has to be perfect, constantly, or he'll dust.
Despite this, Blue's managed to wrangle the Guardians of Feelings into a truce, bringing a tentative peace to the greater Multiverse. Looming over his shoulder however is an old, buzzing threat Blue keeps trying to meet with a smile and a wave. The twins aren't the only outcodes Blue's been managing.The Gang, meanwhile, are having their own issues, though none more than Killer, who's finding his emotional Drainings are working less and less by the day.
Most frightening of all, now things are a little more settled Blue may finally have to face something scarier than staring down Nightmare or Dream or the Destroyer had ever been: himself.
Series
- Part 7 of Blue's Emotional Intelligence Toolkit
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Summary
"Mt. Ebott Holds Monsters?" You click on the article.
Well.
That's weird.
- Language:
- English
- Words:
- 1,668
- Chapters:
- 1/30
- Kudos:
- 1
- Hits:
- 17
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A Beginning of Something New by kittyKnockerz
Fandoms: Sans AUs - Fandom, Undertale Multiverse - Fandom, Undertale (Video Game)
21 May 2026
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Killer sans lives a life of sex trafficking. He'd never seen the outside world, he'd never known anything but within those walls. Yet, something new happened..
A new person came, but this time he wasn't afraid. As long as he got to see the stars of the sky, he could die in peace.But, that was only the beginning of his story. A story of a beginning of something new
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Your Fear Is Tasty (Horror!Sans x Reader) by Cat_0967
Fandoms: Undertale (Video Game), Horrortale - Fandom
21 May 2026
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Summary
You fell into the underground and try to get out of here alive but things doesn't go the way you or anyone expected, fortunately you have the greatest guide to help you. :)
This fanfic is a Horror!sans x reader although I hope I can turn it into a slowburn, I haven't written any fic in a long time and English isn't my first language but I think I still got it in me. ahahahh I'm really excited about this !
Comments are appreciated if you have any suggestions for a chapter or if you find anything weird, out of place or any mistake but do not feel obligated.
Also I wanted to start this mainly because of a friend's request but also because there's not much of fanfics on horror recently... lol
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Rules to Survive the Zombie Apocalypse by BattleMaiden13
Fandoms: Undertale (Video Game)
21 May 2026
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You have no idea when the world went to shit, but your pretty sure it was either when the dead came back to life and chowing down on anything with a pulse OR it was when you flunked out of college. Either way the world sucks now. You aren't entirely sure how you've survived this long either but your pretty sure it's due to your handy dandy rule book that you always follow to the T. well you follow it most of the time to the T. and everything was going great until you were basically kidnapped by a pair of skeleton monsters. That's went your world went from pretty ok to down right H, E double hockey sticks.
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Looking Up At Heaven by ASTMVN
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
21 May 2026
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The second chapter of To Clip An Angel's Wings, and the first chapter of the Dessoul route. El wakes up in the aftermath of their breakdown, finding that the world has need of its Angel yet. And perhaps, that their vigil may not be a lone one.
Series
- Part 3 of To Clip An Angel's Wings
- Language:
- English
- Words:
- 4,454
- Chapters:
- 1/5
- Hits:
- 0
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Summary
After a year of dating, Clover and Kanako are finally ready to take their next step in their relationship.
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Oh mother, I can feel the soil falling over my head by asterthestargazer
Fandoms: Undertale (Video Game), Undertale Multiverse - Fandom, Undertale Alternate Universes - Fandom
21 May 2026
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Dream, Guardian of Positivity, had trouble being positive himself. He was such a happy pill towards everyone. His memories of his childhood haunted him as he and his dear brother are forever torn apart.
From all of his bottled-up emotions, he breaks down and punishes himself for the past. He decides to make a hard decision, being more open with his feelings and to heal. Throughout this journey, he finds out that he’s not the only one struggling in this ill-fated destiny.
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Summary might change
This is just a little vent except I projected it on my kins! Doing this makes me feel heard dw :)
I’ll put alot of themes on stargazing and constellations if anyone’s interested
WARNING: This fic will contain self-harm, suicidal thoughts, themes of depression
If you’re uncomfortable with any of these topics, please don’t read this fic! Take care of your own mental health!!This is my first fic WOW
Title of the fic is from the Smiths, each chapter is going to be a lyric -
The Outer Realms by SarcosticSarcomere, TheDepressedJuggalette
Fandoms: Undertale (Video Game)
21 May 2026
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Written by: Ouija Board Demon the Depressed Juggalette and SarcosticSarcomere
The creators have just left en masse, leaving Ink in a pit of tension and apprehension. The multiverse is due for a change, but the answer as to what lies beyond familiarity and old bonds.
Out with the old, in with the new.
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The year is 2038, It has been 20 Years since the post-apocalyptic event known as the "Roaring", what had killed over 1 Billion Humans and Monsters, with a Corporation rising out of the ashes to try and repair what remains of the broken world post-Roaring, known as the "Humanitarian Organization For Project Redevelopment And Expansion"
Yet troubled 38 Year old Asriel Nikolas Dreemurr on a routine mission has found himself intertwined with his teenage hearthrob, December Desmond Holiday, on her attempt to escape the demons of her past.
He must learn the truth about the Roaring, and how H.O.P.E has concealed the truth for over 20 Years, and about how his beloved doe is involved in this, how a mysterious Cult of Supersoldiers known as the "Church of the Morning Star" relates to the the corruption within the highest ranks of H.O.P.E, all in an effort to escape the lives they have found themsleves forced to live post-Roaring.
How far would you go for love?
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What if you had been more frantic in your letter back to Mr. Green?
An alternate route to the work Six Skeletons, One maid.
(And a rewrite of my original fic , because I do not like the way I wrote it three years ago,,)