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Mamadillo Fan-Content: Oneshots by youraveragefanficreader1710
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), OneShot (Video Game)
03 Nov 2025
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A contribution of oneshots for an Undertale Yellow AU from UTY Sub-Reddit called "Mamadillo" made by u/CandidCriticism1730
To put it simply, at one point Dina (The Wild East's Saloon Owner) adopts Clover. That's it, and I love it to the bottom of my heart.
And here I am, making a chapter whenever I can to contribute more fluffiness, or angstfest :V
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What if Ceroba takes advantage of Starlo regularly when drunk, and he takes it because he has feelings for her?
Old /v/ greentext I did with a bit of editing
- Language:
- English
- Words:
- 587
- Chapters:
- 1/1
- Collections:
- 1
- Hits:
- 118
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UDY on the Surface by CommanderBullet
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
02 Nov 2025
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It's been a few years since Monsters returned to the Surface and lots of things have changed... Accompany your favorite characters from Undertale, Undertale Yellow and Deltarune as they try to manage their everyday responsibilities and go through a few wacky adventures while at it in this slice-of-life crossover AU.
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The Last Amalgamate (The Peacock AU edition) by WingsOfShen
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game), Kung Fu Panda (Movies)
01 Nov 2025
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After millennia, the barrier keeping the monsters Underground has finally broken. The entirety of the Underground does not remember what happened. All that is known is that a living human child was involved.
Before starting a new life on the surface, Frisk joins Alphys in sending the final amalgamate back home to her family, making new friends along the way and giving them their much-needed happy ending.
(Based off "The Last Amalgamate" by VyletBunni and the DeltaTraveler team. Credit goes to them for the animation series.)
Series
- Part 4 of The Peacock AU
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North Star, mostly through accidental meetings, creates the best team in the Underground.
If only he knew they cared about him as much as he cared about them.
It's a shame it took almost dying to realize it.
Series
- Part 1 of anjelly's Undertale Yellow Nonsense
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Desert Sanctuary Guidebook by KarmaSpidr
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
26 Oct 2025
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Clover doesn't give up his soul because justice still needs to be delivered.
The Wild East, and later practically the entire Dunes, declares independence. They declare that any human within their borders is under their protection.
Civil War looms over the Underground.
Would you like to see what happens?
Note: This is NOT a story. This is an archive containing information about my AU, Desert Sanctuary. I might write a proper story in the future, but for now, this is where you can read about the narrative, the characters and how this massive change affects Frisk's journey.
Fanart and other fan works based on Desert Sanctuary are welcome and encouraged
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It Takes A Village by DiamondDeputy (EllaMayLowell)
Fandoms: Undertale Yellow (Master Sword Video Game), Undertale (Video Game)
25 Oct 2025
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All Clover wanted when they entered the Underground was to find the missing children. Instead, they found a legacy of pain and hostility that helps no one. They can’t be sure of what they should want.
All Clover wants now is to live peacefully with their friends, perhaps excluding the one that wanted to kill them. But she’s far from the only one: a human in the Underground is only good for their SOUL. They can’t be sure they’ll ever get what they want.
It only takes seven to free all of monsterkind. But in the meantime, the Royal Guard is on the hunt, Kanako’s status is still a mystery, and Clover’s absence is felt back on the Surface.
(Or: Clover lives AU, and the dynamics and conflicts that follow)
Series
- Part 3 of Ella-May's UTY Retelling Collection
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Gunpowder and Cocoa Don’t Mix Very Well by Random_Writer9
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
22 Oct 2025
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Clover had accepted his fate. Giving up his Soul to free Monsterkind was his final, ultimate act of justice. As his vision blurred, he surrendered to the euphoria, certain his story had ended.
Then his eyes opened. He was back where it all began. Disoriented but alive—only one thought came to mind.
Finding his friends.
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Flowey had planned to let Clover rest–honest! But as his vine hovered over the Save button, ready to overwrite Clover’s file–a flash of memory made him pause.
It was the run where he lost.
That alone was rare. But it wasn’t the loss that made him pause. No, It was who he saw in it.
Something shifted in his mind and as the gears turned a new plan started to form.
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Chara hadn’t expected to wake up, not after their plan to free Monsterkind had failed. They especially hadn’t expected to wake up to a Cowboy slaughtering monsters.
They reached for their save, determined to stop him.
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The timeline has become unstable from the three beings forcefully seizing control over it in rapid succession. The instability grew to be severe enough that the boundaries between past and future have started to blur into an unrecognizable present.
Series
- Part 1 of Gunpowder and Cocoa
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Did I do something wrong? by YouveGotToBeKittens
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
07 Oct 2025
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Clover, after an aborted genocide, has Flowey reset. Somehow, though, they start to remember their past attempts.
Fluff ensues.
Also angst. -
CKFT!Deltarune Yellow by Cmastashizzlerizzle, kiwi_roof
Fandoms: Undertale (Video Game), Deltarune (Video Game), Undertale Yellow (Master Sword Video Game)
06 Oct 2025
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Clover stumbles into a world of darkness. What mysteries and adventures will await them?
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Concept: UTY AU from the perspective of a military veteran investigating the disappearances of the eight human children last sighted near or at the base of Mt. Ebott.
After having completed her eight years of service, she goes home to find her younger sibling has disappeared. As she inevitably finds and descends the entrance to the underground, PTSD surfaces. This soldier has seen the worst of humanity, and battles the sins of her past actions.
Clover has made a sacrifice, but things end up differently than what his friends expected. Having found an amnesiac Fox monster, the Ketsukane family takes him in as their own.
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Good Afternoon, Good Evenin', and G'night by Kofhearts13
Fandoms: Undertale Yellow (Master Sword Video Game)
04 Oct 2025
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The Starlo show, rather than the Truman show.
(If you are unaware of what the Truman show is, it's a movie where a man's entire life is actors and he's on television 24/7 and he has no idea)
This fic makes several references to the original movie, but can be read without watching it, hence why it's not marked as a crossover. (I would recommend watching it, though. I quite enjoyed the movie.)
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Starlo's trying his best to hold onto hope. Not that there's much of it left these days.
(Starlo POV of events from "But Hope Remained", with some connective tissue between them.)
Series
- Part 2 of pandora & hope
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The One Where They Walk Home by Whipple
Fandoms: Undertale Yellow (Master Sword Video Game)
29 Sep 2025
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Five times Starlo walked Dalv home to his cozy Snowdin cottage, and the one time Dalv returned the favor.
(In which two monsters, while walking home, neglect to realize they’ve already found home in one another.) -
The Dual Lights in the Underground by therealone12131
Fandoms: Undertale (Video Game), Undertale: Yellow, Undertale: Red and Yellow
29 Sep 2025
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It's been several years since the last human fell into the underground, and today, in the year 20XX, the eighth human falls in, just like the rest. Two unfamiliar, ghostly friends will await this human, but...
The human isn't Frisk.
A whole different adventure awaits this new human.
If you're new to reading this, it gets so much better after the first two chapters, trust!!!Inspired by the Undertale Yellow fan game by Master Sword and the Undertale Red and Yellow mod by Shinix.
Absolutely love their work, I hope my writing can match even a 10th of theirs. -
Supernova by EmbretheWorld
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
22 Sep 2025
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Supernova - when a star runs out of fuel, its core collapses, resulting in an explosive demise.
The death of North Star and the rebirth of Starlo.
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Двојна Монархија by Ramencubed
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
20 Sep 2025
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Ђиленин сан месецима је био да, у неко следеће доба, се попне на планини Ебот која се налазила у близини његове домовине... Али су животни услови код куће га натерали да ту "експедицију" уради раније него очекивано, као нека задња жеља. Није уопште очекивао како ће да буде резултат његове експедиције.
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Feisty Squirrel and her new Mamadila? by Narcias
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
20 Sep 2025
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This is a Mooch and Dina focused fic for any big fans of the two. Many sad, happy, angry and whatever other emotions that exist shall be in play. A fic post pacifist ending a little bit of time after.
(Mooch is around 14 or so in this fic for my story. Personally though i think she's just at an age right UNDER 21 and that's why she's not allowed a Adult soda in the game. ;p) -
Chujin Ketsukane: The Thornmate by RebyStudios
Fandoms: Undertale Yellow (Master Sword Video Game)
14 Sep 2025
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Chujin's dust goes to the surface, but everything isn't great like he would imagine.
But maybe an ex murderer will make things work and maybe, just maybe, he could make a new a thought about the humans. Just if the human can be more softer on the monster.
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Worth A [Shot] by Grand_Spurinko
Fandoms: Deltarune (Video Game), Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
11 Sep 2025
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Clover is torn between his duty and his chance at a better life.
Flowey must figure out why his RESET button isn't working.
Martlet, Ceroba, and Starlo have to figure out how to care for Clover.
Above all, Spamton G. Spamton must figure out how in the [All Expenses Paid Vacation] he got here... and maybe make some [Deals] along the way.