1 - 20 of 4,698 Works in Alphys/Undyne (Undertale)
Navigation
Listing Works
-
Making A Monster by absurdmagewrites
Fandoms: Undertale (Video Game), Underfell-fandom, Underswap-Fandom, Swapfell-Fandom, Fellswap-Fandom, Fellswap Gold-Fandom, Horrortale-fandom, Crafttale-Fandom, Seaswap-Fandom
07 Sep 2025
Tags
Summary
Sometimes life throws you a curveball. For you, your curveball was going to bed looking like a human, and waking up looking like a monster.
A skeleton monster to be precise.
With the barrier breaking, a large surge of magic descended on the town you live in, and transformed you overnight. Unsure what to do with you, and the others changed, you're ushered into a facility until a monster with similar magic can take you to teach you how to wield the now uncontrollable magic you've been given. After waiting in this place for four years, you'd given up hope that anyone would ever want to take you.
What a surprise for you when you find out that someone does. A lot of someones.
-
Eight Skeletons Compete for My Attention and None of Them Pay Rent (And Neither does the Ghost) by Itsyaboisunnyd
Fandoms: Undertale (Video Game)
07 Sep 2025
Tags
Summary
Living with skeleton monsters was supposed to be temporary. A law, a requirement, a way to smooth over integration. But secrets linger in the walls, a machine that hums at night, skeletons who call themselves cousins with stories that never line up, and a shadow you think you can only see. You keep telling yourself you could not see him. You tell your roommates nothing at all.
But lies don't last forever. -
Long live the Monarch! by urmom_friskas for Alexandra_green
Fandoms: Undertale (Video Game)
07 Sep 2025
Tags
Summary
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…
-
UDY on the Surface by CommanderBullet
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
07 Sep 2025
Tags
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.
-
Tags
Summary
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
Tags
Summary
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.
-
Tags
Summary
(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
-
Tags
Summary
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
-
Tags
Summary
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.
-
Snowdin Adventures with the Skeletwins by Just_AliAnne261
Fandoms: Undertale (Video Game)
05 Sep 2025
Tags
Summary
"You want to know what to do here in Snowdin? Grillby's has food, and the library has information... If you're tired, you can take a nap at the inn. It's right next door - my sister owns it.
"And if you're bored, you can sit outside and watch those wacky skeletons do their thing. There's two of them... Brothers, I think. They just showed up one day and... asserted themselves. The town has gotten a lot more interesting since then."
The daily lives of wacky skeleton brothers Sans and Papyrus. Watch and read as they get into all sorts of wacky adventures, cause mayhem, and learn life lessons along the way!
Series
- Part 1 of Skeletwins
-
Tags
Summary
Unwilling to kill to claim a soul—or to strike down the monster king to escape—Frisk chooses to stay underground. The monsters crown her their princess, and she grows up among them, a symbol of hope and peace.
But shadows from the past refuse to stay buried.
When the fragile peace begins to crack, Frisk must face what she's tried to forget. Alongside her childhood friend, Sans, she sets out to protect the only home she's ever known—and the people she loves—from a threat that spans timelines.
With original art. Inspired by Seventh Soul by 8TheKat
-
Tags
Summary
(Minha própria interpretação de Dustbelief, tem bastantes divergências do canon)
Papyrus olhou para o seu reflexo no rio de Waterfall, sua expressão vazia e sem nenhum vigor.
Ciente de como a poeira de monstros estava em grande parte aglomerada em suas luvas.Ele tirou vidas inocentes com as suas próprias mãos.
Papyrus não era mais o mesmo.
Series
- Part 1 of A calmaria antes da tempestade.
-
Tags
Summary
Keep on loving! Keep on fighting!
~-~
Cross is forced to learn his value, one step at a time.
Blue is forced to learn his limits, one step at a time.
Neither of them are happy about this. A certain group of murder-happy skeletons might make it all worth it, though.
~-~
updates every other thursday until completion!
(ink belongs to comyet/myebi! i encourage you to check out the ink faq to learn more about their wishes regarding him)
Series
- Part 1 of Heartverse
-
Sick To Death (Of Me Chasing You) by CrossoverAU
Fandoms: Undertale (Video Game), Alice by Heart - Sheik/Sater/Sater & Nelson
04 Sep 2025
Tags
Summary
Raine was sick. Really sick.
The kind of sick where, despite not knowing what she had, she knew she didn't have long left.
Her best friend Sans knew that too.
Not wanting her to live her last moments trapped in her house, Sans read her one of her favorite stories, Alice in Wonderland.
While chasing her through the pages, Sans learns that he loves her too much to let her die.
Will he be able to let her go or will he try to selfishly stop the clock?
Aka an Undertale/Alice By Heart crossover fic because I couldn't find one
Note: knowledge of Alice By Heart isn't needed to read this fic!
-
Justice and Injustice by lapisplayer21
Fandoms: Undertale (Video Game), Deltarune (Video Game)
04 Sep 2025
Tags
Summary
Four years have passed since the barrier was destroyed, and monsterkind returned to the surface. William is happy to see that, thanks to his help, monsters have been able to build lives alongside humanity. His son, Micheal, couldn’t be happier either, with Noelle by his side while surrounded by friends.
However, figures from William’s past began to move their plans into action. As the future of monsterkind and humanity is jeopardized, William, alongside his family and friends, will have to stand against the coming threat, and grapple against those who believe that they are delivering justice to the world.
Series
- Part 2 of The Henrikson Saga
-
How to Embrace Your Newfound Freedom: A Comprehensive Guide by BitchReaders24
Fandoms: Hazbin Hotel (Cartoon), Undertale (Video Game)
03 Sep 2025
Tags
Summary
Angel Dust's contract with Val has FINALLY been broken, and now the spider is enjoying his new life as a free spider...right? He doesn't have to put up with Val's shit anymore. No more being told where to go, what to do, how to act. No more long nights at the studio. No more abuse. Angel should be ecstatic that he's no longer on a leash, so...why does he feel so empty?
Join Angel Dust as he navigates through his new life without Val, and the brand new friends he makes along the way.
- Language:
- English
- Words:
- 1,382
- Chapters:
- 1/?
- Kudos:
- 1
- Hits:
- 14
-
Tags
Summary
Frisk and Leo (the Bravery SOUL human) have been friends forever, since they were babies. Now, the two 10-year-old children are drunk, chubby and currently at the bottom of a mountain in an underground civilization of monsters...but a True Reset says that this will be a first for both of them, so it's up to two drunk kids to guide themselves back home - without dying, that is.
(DISCLAIMER: DUE TO LACK OF INFORMATION ON THE OTHER FALLEN HUMANS, MOST STUFF LISTED HERE ABOUT THE BRAVERY SOUL HUMAN, WHO I'M CALLING LEO, WILL BE MY PERSONAL INTERPRETATION. DO NOT TAKE ANYTHING LISTED HERE AS FACTUAL INFORMATION ON THE BRAVERY SOUL HUMAN).
CW: Drunk Children, Fantasy Violence, Partial Nudity (not shown or described), Minor Weight Gain Elements.
Series
- Part 1 of Undertale: Partners AU
-
Tags
Summary
"Traumatized people chronically feel unsafe inside their bodies: the past is alive in the form of gnawing interior discomfort."
-The Body Keeps The Score, Bessel van der Kolk
Dr. W.D. Gaster is not a happy man...but he had been, once. Perhaps he could be again.
...and he can't stop thinking about you. Can't make himself stop thinking about you.
A story in which love, quite literally, saves the world.
(Now in Arc 2)
-
Of Shadows and Hopes by Nadia_Sempai
Fandoms: Undertale (Video Game), Don't Starve (Video Game)
02 Sep 2025
Tags
Summary
Finally finding an escape from the world of Don't Starve, Wilson finds himself in a world unfamilliar from the one he knew before.
He isn't alone, though, Frisk and the monsters he calls his family will be there.
Somehow... Wilson P. Higgsbury knows this won't be as easy as keeping himself alive in his old prison.
-
Tags
Summary
You're an engineer who works for Ebott's best research facility in one of the labs; your lifelong dream after finding a journal on Mount Ebott when you were a kid. When you aren't in the lab being smart, you're gathering materials at the abandoned doll factory for the machine you're trying to build.
But one night, you meet a skeleton at the factory. Naturally, you lie about why you're there and say you're there to hunt ghosts. You befriend him and try to find a way to gather the materials while keeping up with that lie. But those lies catch up to you when you start to meet all the other skeletons.
Edit: As of Chapter 29, all chapters have been edited and fixed slightly!