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Crossovertale - An Undertale AU Crossover by Samgamer901
Fandoms: Undertale (Video Game)
09 Jul 2026
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Summary
It’s an Undertale AU Crossover. That’s about it. It will probably have a lot of OC’s, they will all try to be explained. Also, you’ll wanna have pretty good knowledge about Undertale, the more popular AU’s, and maybe Deltarune to read this.
- Language:
- English
- Words:
- 2,138
- Chapters:
- 2/2
- Hits:
- 3
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Summary
Sans has lost count of how many timelines he's watched end.
Every RESET follows the same pattern. Every battle ends the same way.
Until one day, it doesn't.
Frisk remembers nothing. A strange necklace hangs around their neck. And a cloaked stranger has entered the Underground—someone who was never supposed to be there.
For the first time in a long, long time...
The timeline has changed.
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The Forgotten Legacy by TraitofConfusion16
Fandoms: Undertale (Video Game), Among Us (Video Game), Dream SMP, Video Blogging RPF, Just Shapes & Beats (Video Game), Dangan Ronpa Series, Bluey (Cartoon 2018), SMG4 (Web Series), Animator vs. Animation (Short Films - Becker), Sonic the Hedgehog - All Media Types, 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
09 Jul 2026
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Summary
Reality and Fiction. One that resides in our world and the other that we create. Now, what if I tell you that there’s a universe where two exist in the same world? In a world where both real people and fictional characters live on the same planet, what do you think would happen? Would it be peace, chaos, or something much deeper? Let’s take a look at one of them to see how they live in such a world like this and find out for ourselves!
If you want to adapt this into a comic, animation, or whatever you want, then you can do it without my permission. Just don't forget to credit me as the original creator of the AU.
Series
- Part 1 of The NC Series
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Summary
Deltarune chapter 6 real
- Language:
- English
- Words:
- 624
- Chapters:
- 1/1
- Kudos:
- 1
- Hits:
- 6
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Summary
Frisk and Chara have freed the monsters from the Underground, but the cost — paid by humans and monsters alike — has been steep. What blooms after a victory like this is not given; it must be tended. In the wake of their victory, Frisk, Chara, and the Dreemurr family must confront their past and determine what their future will look like as they look to mend the rifts a century of imprisonment and tragedy have created.
Series
- Part 2 of Where the Flowers Grow
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Summary
Just a bunch of silly, fluffy one-shots featuring Sans and Papyrus being their best brotherly selves.
Series
- Part 11 of Skeletwins Side Stories
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Undertale Purple - Perseverance by AnonymousWriter08
Fandoms: OMORI (Video Game), Undertale (Video Game)
08 Jul 2026
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Summary
A long time ago... humans and monsters lived in harmony. Until war broke between the two races.
The humans were victorious and sealed monsterkind deep underground with a powerful spell, that could only be broken with the power of seven human souls.
This was the tale of Mt. Ebott, and the tale trascended into legend. Those who climbed the mountain, weren't seen again.
And so, begins the tale of the fifth human soul to fall into the land of legend, to fall... into the Underground.
This is the tale of the Purple Soul... Sunny Suzuki.
NOTE:
Currently being rewritten
Suggestions are welcome :)Rewritten chapters: 15 of 20
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Summary
Papyrus is mourning, though he knows his lover is not dead. Only missing.
He’s only missing them to the point of wanting to rip his soul out.
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You are not a person.
But perhaps a certain skeleton can make you one.
—————————
Or, reader is a shapeshifter that feeds off of love who hoodwinks Papyrus into thinking they’re his child. Does it count as found family if you stalk them first?
Series
- Part 6 of How To Be A Human Being
- Part 6 of I/Me/Myself
- Part 1 of Into the Woods
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Off-Script Storyshift by Logi87
Fandoms: Undertale (Video Game), Storyshift (Undertale AU)
08 Jul 2026
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Summary
In search of a missing relative near Mt. Ebott, Frisk falls in the Underground. What should have been a short stay soon turns into a perilous journey through places far different from what they expected.
Note: This story is my personal interpretation of Storyshift. It includes some heavy headcanons that diverge from both the Pre-Boot and Reboot versions of Storyshift. I am using this AU as a creative sandbox, so please keep that in mind while reading!
Check out the original by Voltra here:
https://ut-storyshift.tumblr.com/I hope you enjoy the story!
- Language:
- English
- Words:
- 9,191
- Chapters:
- 5/?
- Hits:
- 46
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Fuzzy Feelings by Maiuo
Fandoms: Undertale (Video Game), underswap, Underfell - Fandom, Swapfell red - Fandom, Swapfell Purple - Fandom, Bittybones - Fandom, Bittyreaders - Fandom
08 Jul 2026
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Summary
With no memory of anything else besides your childhood companion, Oliver; You are forced to live in the woods, thankfully in a very large building that serves as your new home.
It was peaceful; You were making due with what you had. Some slip-ups here and there, but they were quickly forgotten as you had made this large complex a haven for yourself and Oliver. With it becoming winter soon, surely you can fix it up before the cold weather hits!
Things were well, despite you being only a foot tall.
...Wait.
What do you mean there's now 10 Skeleton Monsters taking over?!
Series
- Part 1 of Confusing Emotions
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Summary
You are a biologist, graduated with a degree in Biology. You have a dream, a dream that is impossible to achieve, a forbidden dream. You want to achieve it, even if it's difficult. Suddenly found someone who is the key, a key for you to achieve your dream, just your single dream.
A royal scientist.
- Language:
- English
- Words:
- 814
- Chapters:
- 1/?
- Kudos:
- 2
- Hits:
- 25
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Summary
Rather than the selectively mute child who let things flow without any thought of disturbing the pre-established script, it was the mafia boss (in training) who descended to the UNDERGROUND instead.
And Sawada Tsunayoshi never like it when someone tried to chain his will down like a mere puppet.
Series
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Summary
When the quiet solitude of your new life is disrupted by a gaggle of skeletons moving in next door, you and your sibling find yourselves pulled into their orbit. Healing takes time, but maybe, this chaotic, affectionate family is exactly what your soul has been waiting for.
*Inspiration taken from "Bonely Hearts Club" fangame by owl-bones (http://bonelyheartsclub.tumblr.com)*
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Summary
The idol group Blushing bones is super famous and somehow miraculously you ended up dating one of the idols.
At least it feels miraculous at first, but the longer your with Blue, the more it feels like something is wrong.
Series
- Part 2 of Starstruck
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Shades Of You by TheApproachingStorm
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
08 Jul 2026
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Summary
After sacrificing their soul Clover had a lot of time in the Void.
Then somebody calls him for help, he answers the red soul's call.
And after some more time there Clover wakes up at the same patch of flowers he did long ago.
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Summary
Undyne has killed the last human.. and nothing happened. The Underground was freed, and the World saved. The legend of the Delta Rune comes to a tragic end. Sans must now learn to cope with his depression and PTSD, the source of which he can tell no-one about, and learn to survive in this healed world. Welcome to the Kintsugi Timeline.
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Summary
You are a hybrid, and after a job interview at the royal guard headquarters, you go to rest in a coffeeshop, but there's a VERY rude skeleton monster there
Series
- Part 2 of Hybrid reader
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When life gives you a gun, you're gonna shoot. by Quinme
Fandoms: Undertale (Video Game)
08 Jul 2026
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Summary
One moment you were on the call with your friend, the next you are in a shady dark alley, pressed by... a crocodile in fedora?
Life is confusing, and you have no damn idea where you even are and what will come next.
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Summary
Slice of thier lives, Frisk trying to gain the courage to confess thier feelings for sans.
I changed the Title. Originally it was just 'Happy Valentines day.' Which is just boring.
Series
- Part 19 of Old fics
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Everybody Here Wants You by Super_Nova11
Fandoms: Undertale (Video Game), Underfell - Fandom
08 Jul 2026
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Summary
Hmm, such a thing of wonder in this crowd
I'm a stranger in this town
You're free with me
And our eyes locked in downcast love
I sit here proud
Even now you're undressed in your dreams with me~~~~~~~
You didn't cheat out of retaliation. To make things even. Perhaps some part of you did, a small vindictive part that had been simmering ever since you found those lipstick marks on his collar, and perfume wafting off of his clothes that certainly wasn't yours.
No, you just wanted someone to touch you, needed it after a year of just you and your fingers. And, oh, that skeleton you found at the club? He most certainly knew how to do that, and then some.
But, Alas, you only planned for it to be a one time thing, a nice night to help fill that ache in your chest, for now, atleast, until it came crawling back. You didn't think you would ever see him again.
And then you did.
Over
And Over.
~~~~~~~
《Underfell! Sans x Reader fic》