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One day, you wake up to find that you're in the world of Deltarune. At first, you're scared. Then excited! But then the despair trickles in as you realize you might not get to go back home...
(also Kris hates your guts. Sorry.)
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It Takes Time To Heal by Almondwater
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
19 Oct 2025
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Follow Izumi as she falls into the underground, wishing for her death, but Toriel is there to guide her and heal her.
Series
- Part 4 of my hero tale universe
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For now, things are okay... right?
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Three years ago, a brother left his sister to search a mountain that no human has ever returned from.
Three years later, the sister, desperate for answers, follows her brother's footsteps.
The two meet again, but the result is likely the most hectic two weeks of their lives. And one of them has already lived an eventful life.
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Whitecoat by bambibeee
Fandoms: Undertale (Video Game), Mafiafell - Fandom, Mafiatale - Fandom
18 Oct 2025
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In a city where monsters rule and humans disappear, you keep your head down and your scalpel sharp. They call you Freya. The cartel’s private doctor. Human. Untouchable. Employed for reasons you can’t remember, protected by monsters you don’t trust. But memories never stay buried forever.
“there’s no basement, dollface,” Sans says.
But the ground is humming. And you’ve learned to stop trusting.
────୨ৎ────
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A Future Without Them by Baddrummer
Fandoms: Deltarune (Video Game), Undertale (Video Game)
18 Oct 2025
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Years pass. People grow. The world moves on without you. The Angel grew content with that for a while. It still hurt whenever they thought of the world that had long banished them, but something new pulled them out of the depths. Now, the Angel walks amongst friends who swear that they will not be banished. Kris, Susie, and Ralsei mean everything to them. Maybe this time, their banishment doesn't have to be as set in stone as they thought.
The Roaring comes. The light falters. Everyone falls.
A desperate connection is established in an attempt to save what remains of the Angel. If they fall, all hope will be lost. The world that banished the Angel long ago has forgotten them, but they have not forgotten it. This connection will have to be enough. Even if the rules have changed irrevocably, the Angel's one goal remains the same: Find them.
Series
- Part 2 of Clawing Toward What Hope Remains
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Dualtale AU: Two sides of truth by ED_Soul
Fandoms: Undertale (Video Game), Underverse (webcomic)
18 Oct 2025
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Description:
This story is based on the distant and little-known Dualtale AU,where nothing is as simple as it seems. In this world, unlike the original Undertale, monsters were never trapped underground. But what was the price for peace between humans and monsters? And how is it connected to XGaster, when these events unfolded long before the X-Event?
(Features characters from Underverse and Undertale,adapted for this story.)Author's Note:
In the Dualtale AU,the famous rule "Kill or Be Killed" is replaced by another:
"Speak out, and you will be silenced."
This is a universe built on lies and dark secrets that everyone holds.Every character has their own agenda and their own rules and it's better not to try and learn them.Series
- Part 1 of Dualtale AU: Two sides of truth
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Just an ordinary trip to the underground.
Oh yeah! And Frisk has the ghosts of all of the past humans in their head! What could possibly go wrong!
Frisk and the humans adventure around the underground, and help to tie loose ends and help each other with their problems.
Series
- Part 1 of Undertale: Sevenfold
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The thing about soulmates is, no matter what pries them apart, they always...always find a way back together
Chapters 1-3: Prologue
Chapters 4+: Main Story
*Chapters set to auto release every Saturday!
*This is a rewrite of I Have The Power of Gaster AND Anime On My Side. Same concept, with a bit of a serious feel.*
**Please be aware that this is not like my usual reader-inserts!! This story is in 3rd person pov, very vague description of a female reader. Unnamed (Pet names only). No use of y/n, y/e/c etc.**
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As you walked you failed to hear the screams of terror of a bus going over 100 miles per hour and the sounds of it starting to bust down- it speeds near the sidewalk—the people in it shriek. Their blood curling screams didn’t occur to you, your headphone quality being way too good. Your shoulders relaxed as you stretched your limbs; very much unaware of the danger and pain that would very much make your life way more miserable. You should move out the way. But- likewise, you are unaware. Of death flickering and time excited to cut your strings.
The bus is almost out of energy- and has been stopped.
Or so people thought.
It began to tilt- right where you were very much slowly walking. Andddddddddd—
It didn’t crush you to death.
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There were legends about that mountain.
Long told fables that passed between towns, of the beasts that lurked in its caverns. Clans of trolls and cyclops, groups of harpies and wild boars—things most travelers would do well to steer clear from.
But its newest resident, a Great Cold-Drake, or so they say, has been wreaking particular havoc on the surrounding villages. Missing animals, people unaccounted for… Anyone going up there was just looking for trouble. You should avoid that path at all costs.
And that’s precisely why you’re going up there. You’re going to be the one to slay the dragon.
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The Tales of Kháos: A Reapertale Re-Take by Palito266
Fandoms: Undertale (Video Game), UTMV
17 Oct 2025
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A sequel to the previous three stories: "Tales of Infinity," "Tales of Pragmatism and Fabulism," and "Zero Tales."
Follow the gods: a brand new species that had been given consciousness by a mysterious form and a body as well. Explore how these deities accustom not only to their existence but also to the world around them that they must protect.Reapertale was created and is owned by Renrink. Inktale was created and is owned by Comyet. Dreamtale was created and is owned by Jokublogs. Errortale and Fresh Sans were created and are owned by Crayon Queen.
(English is not my main language, so there may be some grammar issues.)
Series
- Part 4 of Markings of the Cosmos
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Summary
The monster she fell in love with, had paid her to have sex with someone else. How cruel was that?
Frisk was a petty thief with nimble fingers and a charming smile. Before it all started, she had been on her own, and it was enough to survive. Stealing was easier when your charm had their guard down.
Then she met Sans, and suddenly she found the hope to live. Like a puppet on a string, he’d gotten her along to participate in his crew’s heist, despite being the only human on the team. He insisted on training her flirting skill and even resorted to kissing her whenever they had to teleport. He was enough to make her heart flutter dangerously, and she had to constantly remind herself that it was never going happen between them.
So why did he suddenly change his mind the morning before the heist? Why did he no longer want her to do the very thing he had recruited her to do?
Just as she found out, it all came crumbling down on her. -
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Two souls in the Underground, intertwined by fate and by a prophecy that keeps them apart.
Heads up before you read:
In this fic, Chara is alive and far from a good person. They’re not a mindless killer, but a narcissistic kid. This is not a fluffy Charisk story. Chara and Frisk’s relationship is deeply toxic.Please look at the tags before you continue.
I've been experimenting with third person for a while now, and I've grown to like it a lot more than first person. For those who came from my other fic, which I promised a sequel for, I’ll try my best, but I’m not sure how that will go now that I’ve fallen in love with third person and started a new long fic. Please don’t be angry I will try to finish my other fic as well.
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After the Visitor left behind that angelic abomination who wipe out 90% of humanity, Sam know's that they can't stay in the city. Searching in the former room of Sybil he found the former research of the astronomers and discover a place that was not affected by the visitor, Mt Ebott. He doesn't know why but it seems there is some kind of barrier that keep the place safe during the end of the world.
With only that as his last hope to survive, Sam and his friends go to Mt Ebott but the exalted four find them, taking them one by one until it was only Sam and the childrens.
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The Seven (Plus Chara) have done it; they've ended the imprisonment of all monsters. With Frisk as their ambassador (and Papyrus as mascot), things are sure looking up!
But in the background, things are at play, events that could threaten everyone's happy ending.
After all, just because one story ends it does not mean the Tale has.
Series
- Part 2 of Hall of the Seven
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Years after monster and human society merge, a young monster returns to the Underground with the intention of finding a story to tell. She finds that story in a stack of well loved letters between one Cathode and Mailman.
NOTICE: The final arc of this story contains implied suicidal ideation and serious self-destructive behaviors. If you are not in a position to read this sort of thing, you can stop reading after Chapter 22 and skip from there straight to the epilogue!
Series
- Part 1 of Dear Mailman: Yours, Cathode
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Diving for Justice, Freedom and Managed Democracy by Dangeresque_On_Ice
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game), Helldivers (Video Games)
17 Oct 2025
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Summary
The Monsters were dead.
They must have been, the Federation of Super Earth had said so; annihilated during the Great Galactic War along with all the other threats to Managed Democracy. So Clover was understandably confused when he set out to find the five missing Cadets only to discover a whole society of Monsters sealed underground.
What’s more, these Monsters were nothing like the tyrannical, Freedom-hating killers history had portrayed them as.
Things just weren't adding up. But why? It’s not like Super Earth would have lied, right?
Now with a TV Tropes page: https://tvtropes.org/pmwiki/pmwiki.php/Fanfic/DivingForJusticeFreedomAndManagedDemocracy
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Life On the Surface by RetroWrites
Fandoms: Undertale (Video Game), Deltarune (Video Game)
17 Oct 2025
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Frisk has freed the monsters.
Now all they need to do is to live on the surface.
Campy story with plot and sad stuff on top of regular Undertale shenanigans.
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It's been months since Frisk and Flowey's battle. The former human has fully settled into their new life in the Underground. Things are changing, but they're okay with that. But when they find out that humanity has survived, Frisk must overcome their own struggles and trauma to bring about peace. Not easy when they've suffered so much. And Flowey is still out there, watching and planning.
Series
- Part 2 of Divine Soul