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Mamadillo Fan-Content: Oneshots by youraveragefanficreader1710
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
09 Oct 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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But Hope Remained by theriveroflight
Fandoms: Undertale Yellow (Master Sword Video Game), Undertale (Video Game)
08 Oct 2025
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What remained after Pandora's Box was opened? What stays behind when everything else is lost?
In an Underground where almost everything was lost, one thing remains: the fusion between the SOULs of Kanako Ketsukane and one fallen human.
But Ceroba is trying to learn from her past mistakes, and has some apprehensions about Kanako being used as just a tool.
Alphys, now queen, is trying to learn as well -- to be more open about things, even when they scare her.
But how much is "trying" really worth when compared to the harm inflicted?
Series
- Part 1 of pandora & hope
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Everlasting Justice: A Mega Man x UTY Story by WheatleyTurret
Fandoms: Rockman | Mega Man - All Media Types, Undertale Yellow (Master Sword Video Game)
06 Oct 2025
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With a toy gun in hand and justice in his soul Clover embarks on his mission up Mt Ebott to find and rescue five missing children. But all too soon he becomes a pawn in a plan to steal the fallen human’s souls. Trapped in an endless cycle of death and reloading Clover must find a way to remember the past, evade Asgore’s armies, defeat his Royal Guard’s, liberate the fallen humans and end the death cycle he’s been trapped in. But will he have the strength, will, and determination to succeed? Or is his fate wind up like all the others who came before?
Series
- Part 2 of Fallen Justice
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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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Deliverance From Self-Destruction by Agent_ArcticFox
Fandoms: Undertale Yellow (Master Sword Video Game)
05 Oct 2025
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Alexander Koskinen is not a perfect man, but he’s lived his life to what he believes is the best he could. But after falling into the underground, that belief is shattered, and the guilt that has built up over the years has come crashing down, a weight he can no longer bear alone like he has for so long. Now it’s up to Chujin Ketsukane, patriarch of the Ketsukane household, to help pick up the pieces of this lost soul’s life, lest he be consumed by the past that’s been haunting him for all these years.
Series
- Part 1 of UTY: Absolution
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Dragon Blaz(ing) 2: Tragedy In Blue by paradoxcloned, TGClmao
Fandoms: Deltarune (Video Game)
04 Oct 2025
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I uncovered a mysterious Dragon Blazers 2 ROM hack on an old, obscure forum. To help everyone get the full experience, I've decided to novelise it! Hopefully this makes my exploration make more sense!
Cel, resident college student and now begrudgingly a protagonist, gets heroism forced on them by the hand of fate. Stuck a world based on another's trauma, their real mission becomes clear: they've gotta get out of here.
This is a metafiction story; both about a non-existent creepypasta ROM hack, the changing tides of Deltarune's fate, and an author getting caught up in it.
Perhaps it means something. Perhaps it doesn't. But it exists, and that's what matters.
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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.
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- Part 2 of Hall of the Seven
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Adventure Tale by Kaboom91
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game), Adventure Time (Cartoon 2010)
03 Oct 2025
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After countless runs, something goes wrong, and now humans and monsters alike have been pulled into a strange new land with its own rules and its own dangers. Come Along With Me for the crossover nobody asked for, its ADVENTURE TALE!"
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Sakura Don't Usually Come in Indigo by CouldntThinkOfUser, Rivetsagoner (CouldntThinkOfUser)
Fandoms: Undertale Yellow (Master Sword Video Game), Undertale (Video Game)
01 Oct 2025
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Kanako Ketsukane - Age 10 - Admitted into Royal Scientist Alphys' care on the Thirtieth of September, 2008.
Has not seen home for about a year, does not like how her body is all melty and gooey and dull and blue around her like twigs and she's all long. And absolutely does not like how That Human's voice is in her head.
Adrian Valentine 'Indigo' Harris - Age 11 - Killed on the Third of May, 2001
Feels numb, but feels everything. Knows he screwed up, even if they started it for the most part. Wants to make amends with Kanako, but this fox he indirectly traumatized keeps curling up into herself. And why is she so tall?
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The Prophecy of DELTARUNE tells of seven legendary fountains that will need the power of seven human SOULs to be sealed. Join Kris, Susie, their friends, and six other humans as they work together to save the world… and banish the ANGEL. Grouptale but in Deltarune. Sequel/spinoff to Grouptale.
Series
- Part 2 of Grouptale
- Part 1 of IHF deltarune brainrot
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Embers, Bandages, & Vines: A Recursive Fanfic by 5h1ft
Fandoms: Deltarune (Video Game), Undertale (Video Game), Deltarune: Chapter Rewritten (Fan Work), Undertale Yellow (Video Game)
28 Sep 2025
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inspired by GoblinActivities's [https://archiveofourown.org/users/GoblinActivities/pseuds/GoblinActivities] SOULs Across Worlds Series.
Series
- Part 1 of 5h1ft's SOULs Rewritten Across Worlds
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Old Wounds Need Healing by NotASnowMann
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
28 Sep 2025
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Eight years before the barrier broke, a human by the name of Melody fell into the Underground. Their journey, as a result of their own actions, would be cut short - in gruesome fashion, no less. The human that fell after them, Clover, would learn some of what they had done and the effects that followed.
Eight years later, the barrier broke, and Clover would be led by a flowery friend to a most shocking discovery - Melody, alive and breathing.
But with Melody's revival comes with it the return of old wounds - wounds that Melody needs to at least try to help patch up. But Melody came to the Underground for a reason, and as they work to fix the wounds of others, their own scars become apparent.
Series
- Part 2 of Legacy of a Melody
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Or: The one where an adult Frisk wakes up after their funeral, back at the beginning of everything. Of course, they know how to navigate all their adventures underground, but... Does anyone want to tell them what kind of sin they committed? After waking up each time, in different timelines, some of which they even know they generated, and others that they themselves didn't commit? Yeah, this isn't going to happen (it happens anyway).
Series
- Part 3 of Random Writing
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Undertale Yellow: Defiant Hope by Kanakoke_K9907
Fandoms: Undertale Yellow (Master Sword Video Game), Undertale (Video Game)
25 Sep 2025
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Snowdin, a place usually synonymous with joyous family outings and quality time, became the stage for a cruel twist of fate for young Kanako. She and her family, the Ketsukane, had ventured there for a day of simple pleasures, unaware of the darkness that had recently descended upon the snowy landscape. A human, clad in a dusty tutu, had arrived—not misunderstood or scared, but driven by a chilling love for the game, a thrill for chaos. In this alternate universe, their attacks were not born of fear, but of a cold, calculated desire to kill.
This human stumbled upon the Ketsukane family and, without hesitation, caught Chujin and Ceroba off guard, slaying them where they stood. All Kanako could do was watch in terror as her parents fell, their forms dissolving into dust. The memory, a searing brand, haunts her to this day.
Now many years into the future, she has grown and changed.
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Flowey And The Idiot Children Who Don't Know How To Feel by JesterOSX
Fandoms: Undertale, Undertale Yellow, Undertale Red & Yellow
21 Sep 2025
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Clover is having a hard time coming to terms with their feelings for Chara. Especially now that they're alive and Chara isn't.
Flowey just wants to know when this soap opera gets good.
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UnderTime by WalrusSilverfish
Fandoms: UnderTime (by WalrusSilverfish), Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
21 Sep 2025
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Gaster's group chat he made for his subjects by Gabe_reviews0408
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
19 Sep 2025
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gaster gives Undertale characters from the three games multiple group chats so they could talk and learn about each other.
nothing ever goes wrong.
inspired by the many groups chat fan fictions
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Deltarune: The Lighter side of the Dark by Gabe_reviews0408
Fandoms: Undertale (Video Game), Deltarune (Video Game), Undertale Yellow (Master Sword Video Game)
16 Sep 2025
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Asriel is forced to be transferred to a new college where he meets a plethora of new friends and discovers a new world hidden in the dark where he begins to dig up old trauma and face the truth of what really happened back in hometown. and his friends also dig up their own trauma because they were bound to be dragged into this.
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Gaster decides that to add an Asriel subplot to the story of his Deltarune which may or may not end up changing the events of his story however it doesn't matter as the results will still be Very, VERY INTERESTING