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UDY on the Surface by CommanderBullet
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
07 Sep 2025
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Summary
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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UnderTime by WalrusSilverfish
Fandoms: UnderTime (by WalrusSilverfish), Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
07 Sep 2025
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Twin Runes by Thealmoghtbeyonder2099
Fandoms: Undertale (Video Game), Deltarune (Video Game)
07 Sep 2025
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Twin Runes es un AU cómico en su mayoritariamente alegre centrado en los universos Deltarune y Undertale. Una fuerza desconocida ha provocado que aparezca un punto de conexión entre los dos universos, lo que hace que Frisk y la molestia fantasmal Chara tropiecen en la vida de Kris en uno de sus muchos reinicios (para gran disgusto de Kris). Se produce un caos que rompe el juego.
La traducciones del "los pájaros y abejas" hasta el "No sirve pa' nada" no son mías. Del resto de traducciones si son de mi autoría
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Long live the Monarch! by urmom_friskas for Alexandra_green
Fandoms: Undertale (Video Game)
06 Sep 2025
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After King Asgore’s death, the Underground was left leaderless. Gravely injured from her fight with the human, Undyne was in no condition to rule, so Mettaton stepped in to take her place until she could recover. However, after some time he vanished, forcing the monsters to search for a monarch once more. Then, quite unexpectedly, Alphys proposed a candidate…
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Running through that forest you felt relived
No more fighting no more rings
No more experiments
No more cages
And most importantly your bitty where with you
Wait…are those…more skeletons!? -
Someone Really Cares About You. by Meowzerz_Oh_6
Fandoms: Undertale (Video Game), Deltarune (Video Game)
06 Sep 2025
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Sans Undertale struggles to adapt and move on while integrating on the surface.
The troubles of his past haunt him, the burden of his old home, coming from a different world, being aware of resets, the trauma is all messing with his head.
He’s already fallen into depression and other darker thoughts.
Will he succumb into hopelessness, or will he realize that people care about him in time?
OR
What if Sans Undertale is actually from Deltarune? What will a man with such knowledge and burdens do? Will he stay determined? Or will he succumb into the despair that the universe threw one thing after another at him, as he tries to move on in a permanent happy ending.
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(Dustbelief rewrite, may differ quite a lot from the original comic)
Papyrus stares at his reflection on the river, willing his body to stay still and not look away.
His eye sockets are swollen, devoid of life; he also doesn't fail to notice how most of the scattered dust is located on his gloves.He took innocent lives with his very own hands.
Papyrus was not the same.
Series
- Part 1 of Calm before the storm
- Language:
- English
- Words:
- 1,462
- Chapters:
- 1/25
- Kudos:
- 3
- Hits:
- 14
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The Roaring Of A Blizzard by Mazhatter
Fandoms: Deltarune (Video Game), Undertale (Video Game)
06 Sep 2025
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Summary
Dark, Darker, Yet Darker
The Darkness keeps growing.
On Its Crusade, The KNIGHT Finds Someone Lost To Time And Poignant Memories.
It Raises Its Hand, And Plunges Into The Earth, Pure Darkness Erupting Out.
What Will Become Of Our Heroes When One Falls?- Language:
- English
- Words:
- 1,311
- Chapters:
- 1/?
- Comments:
- 2
- Hits:
- 63
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The Shadow in the Knight’s Hand by Metal_Overlord93
Fandoms: Undertale (Video Game), Deltarune (Video Game)
06 Sep 2025
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In the quiet town of Hometown, everything seems peaceful… or so it appears.
Kris Dreemurr, a lonely teenager haunted by a past tragedy, struggles to find their place. With their brother, Asriel away at college and their best friend Noelle growing distant, Kris feels more isolated than ever. But along the way, they form new friendships, and slowly begin to reconnect with Noelle.
Meanwhile, whispers spread of a mysterious figure appearing around town, a cat-like shape with haunting pink and yellow eyes. Some say it appeared after the disappearance of December “Dess” Holiday.
Now, with strange “Dark Fountains” opening across the land, Kris and their friends must uncover the truth behind Dess’s vanishing and confront the darkness threatening to consume their world.
Series
- Part 1 of UT/DR stuff
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It isn’t fair. You just wanted to be left alone…
Isn’t this what you deserve though? You broke the rules, everyone was perfectly upfront with you on what the conditions for being allowed to live were. It’s the right thing to do, what’s one more time?
Maybe they’ll forgive you if you let them… maybe they’ll forgive you.
You look up at the expressions on the monsters’ faces and you know in your heart that this isn’t going to stop.
Series
- Part 4 of The Power To Reshape The World
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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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"My name is Kris, Kris Dreemurr. I don't know made me the way that I am – but whatever it was, left a very hollow place inside me."
"Monsters fake a lot of their interactions, but I feel like I fake them all very well. That's my burden I guess – as a human."
"But I can’t blame my foster parents - Toriel and Asgore Dreemurr did a wonderful job raising me as one of their own."
"They're both divorced now.""I didn’t cause it – honest."
"At least I hope I didn’t."
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RE:Undertale by WrestleZero
Fandoms: Re:ゼロから始める異世界生活 | Re:Zero Starting Life in Another World (Anime), Undertale (Video Game), Earthblade (Video Game)
06 Sep 2025
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After dying from The Great Rabbit a second time, Subaru woke up in a field of flowers.
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Grey Script is an Original OC based in Undertale Lore.
A skeleton awakens to a world she knows and knows nothing about. Her past is locked behind trauma and the one who can help her is locked in their own battles. Will she be able to face her trauma and live a new life with the other? Or will she succumb to its darkness and dust?
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Chara lives a lonelly and boring life in her farm near Mount Ebott. Its peacefull but nothing really hapens.
One night after a weird dream, she finds herself climbing the moutain for reasons not even she knows, and there on the ground, she finds something that will totally change her life.
A slow burn fic focused on the daily life of the characters and their relationships, plot may take some time to appearOr alternative title - Im still stuck on 2016 and couldn't find any CharaXSans fanfic i liked, so i made my own
Hope you guys like ituptades slow! Usually once a month!
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Frisk's spaceship crashed into an unknown planet, having only injuries and their determination they kept moving forward—ready for whatever this planet threw at them.
This is an Outertale inspired AU, enjoy!!
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Timeless Justice by TheDoctorWD
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
06 Sep 2025
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Summary
After countless resets and endless repetition.. something has changed. The timeline has began shifting, changing its path for the first time in a long time. A new path Flowey hasn't seen before.
Well, it might take Clover longer to reach Asgore but Flowey has all the time in the world after all. And seeing something new finally happen has piqued his curiosity. Drawn in by the unfamiliar, Flowey watches with morbid fascination as Clover is not able to give up his soul this time. Encounters shift, monsters react differently, and the world itself begins to remember things it was never meant to.
Events shuffle. Characters act out of turn. Rooms appear where there were none. And for the first time in countless resets, Flowey doesn't know what comes next. Clover's fate is uncertain. Though Flowey knows he will get those human souls, no matter what.
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Calcination Syndrome by Fells_Kitten (SquirrleyCow)
Fandoms: Undertale (Video Game), Underfell - Fandom
06 Sep 2025
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Calcination: The process of heating a substance just below melting point to induce change in physical and chemical properties, to remove impurities and ensure specific reactions and outcomes...
Grillby has a perfectly normal attraction to his long-time friend and nightly regular at his bar, Sans. He's been dying for a chance to act on that attraction but keeps backing-out before he can follow-through. After patiently biding his time for the perfect moment he finally makes his move.
Sans is contently unattached to anyone romantically. He has his friends, he has his brother, he has the bar and Grillby's usually quiet but comforting company. What more could he need? He hasn't considered a life outside of living with his brother and the occasional random hook-up to blow off steam. Sure, he's noticed Grillby, he's not blind after all. But from the outside looking in, it's always felt like Grillby was just as happy being single as Sans is. Being a single dad, even with a grown kid, probably changes your standards for a partner anyway. Well, until Grillby kidnaps him that is.
Waking up chained to a bed kind of changes your perception of a guy.
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I Choose to Reset by KayinDreemurr
Fandoms: Undertale (Video Game), Fallout (Video Games)
06 Sep 2025
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The Bombs Fall, but Frisk’s special gift gives them a chance to change things. Suddenly, they’re back at the very beginning of the Ruins, two years prior. For a moment, they’re not sure what to do, but then they realize there’s plenty they can do. And so, with renewed Determination, they set forth.
Series
- Part 1 of A Better Future, Underground!
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Your friend, Aloria, abandoned you-well it’s more like drifting away but she ghosted you for no reason- for her boyfriends even though you were the one who helped her through everything she’s been through. The one to comfort her when she bullied. The one to help her get of her toxic relationship. The one who let her cry on your shoulder till she fell asleep. But you aren’t going to fight for her anymore. You’ll just accept your role as a side line character in her story.
Until you found a creepy pair of skeletons.