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Nathaniel Walker was an ordinary man who worked as a construction worker to support his elderly parents, but unfortunately met a sudden end during an accident at work. Upon awakening in what he assumed to be limbo, his regrets and attachment to his life keep him from passing on yet unable to go back since death holds a cruel finality. In the end, the void takes his soul and he fades into nothing.
...Only for him to wake up in an underground lab, confused and afraid, while questioning why he's a skeleton... and a child at that.
Nathan has never heard of Undertale, so he's experiencing this world for the first time, unaware that his mere presence has a drastic change on the story you might be familiar with. Regardless, his goal eventually aligns with all of monsterkind, which is to reach the surface so that he may try and find his family again. However he may just find a new family while he's down there.
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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
05 Jul 2026
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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.
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It’s fun being dead.
Or undead, rather, as your sister likes to correct you. Your dear sister is the kind of person who took her dark arts very seriously. Or, her necromancy, rather. You’ll be the first to admit, you don’t know a lot about her school of magic. She doesn’t know much about yours either, but it’s always enjoyable to discuss magical theory with her. She says it’s not her specialty, but she tends to under credit herself.
Or: A remixed spinoff story of this_is_my_alt's The Sacrificial Skeleton and the Labyrinth of the Gods <3
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Sans did not remember his previous name, only that he had been human. Rebirth in Undertale was novel, but he adapted, until he realized that the universe he was in was not the original one.
Unfortunately, it was too late when the machine took him to another universe, into a room full of skeletons.
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Sans no recordaba su nombre anterior, solo haber sido un humano. Renacer en Undertale fue una novedad, pero se adaptó, hasta que cayó en cuenta de que el universo en el que estaba no era el original.Lamentablemente, ya era tarde cuando la máquina lo llevo a otro universo en un cuarto lleno de esqueletos.
Nota: Sé que suena como tragedia, pero en realidad es una historia bastante esponjosa de curación, o al menos eso intento. Nuestro protagonista tiene mucho trauma y lo va a sanar en una mansión llena de esqueletos incómodos
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You managed to escape being trapped underground after running into the forest when your parents died in the war. You were up on the surface from birth up until you were the human equivalent of 18. On your 1800th birthday, you escaped your abusive foster home to join the rest of your kind below Mt. Ebott.
I update very irregularly, I try my best but don’t expect updates every week. I tend to evaporate off the face of the Earth sometimes. It’s either that or you get 3 chapters in one day. Have fun reading!
(I hate slow burns, but this won’t be quick. There will be children and unusual anatomy because skeletons) -
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When the people started becoming monsters, Qiunn wasn't surprised. She had been waiting to meat them for years. She just wished they wouldn't keep her waiting.
You know how this gose, Monsters surfacing makes humans become mimics. MC needs help but the font clan already has a mimic to look after.
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Your name is Sans Serif. Your identification card says so. Your work permit says so. Your residential assignment says so. Your brother’s dependency papers says so. The Ministry says so, and so it is true.
But when you and your brother are rudely pulled into a peaceful alternate universe at the worst possible moment, the entire foundation of your identity is put into question. You are one of several. One of possibly more. You don't trust any of this, especially not that human, yet you can't help wondering... should you even try to go home in the first place?
Or
An old fic I started in 2018 and decided, hey, why not revisit it in the good old '26? Machine troupe but you are a Sans, and make it an Anti-Harem.
...Oh, and did I mention totalitarianism? -
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For as long as you remember, you've only known nothing but cold and the feeling of worthlessness. You once had a source of light in the dark but it no longer exists. Will you find it again with your clouded thoughts and memories? Or will you succumb to the rising waters and drown?
In which, you are an AU sans with severe depression, self worth issues and hazy memories of yourself—just wanting to go home…
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“Oh?” Mutt repeated, confused.
“That’s all you have’ta say?” Red exclaimed, bemused. “Your home is gone, and you’re literally stuck in another universe! What do you mean, ‘oh’!?”
“Red!” Edge scolded, shocked at his outburst.
“What!? He should be freakin’ out right now!” Red defended.
“Maybe he’s in shock?” Mutt offered, just as lost.
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You were reincarnated to a world of war with a bundle of tiny bones in your arms. With a crazy scientists chasing you for something you don’t even remember doing, trying to escape with your little brother, living a new life that isn’t quite yours, lots of angst, NEW skeletons that probably think you’re crazy, and even more comfort… you are in for quite the wild ride.
The new chapters are now including a skeleton-house that is becoming VERY concerned for your mental wellbeing, (buried after the much-needed war-trauma,) and you have to deal with a whole OTHER group of crazy people judging you. AGAIN.
But… in order to have the best comfort fic, you sometimes need to have the worst angst beforehand.
Or, as Gaster once said… you need to break a few eggs in order to make an omelette. :] -
The Sacrificial Skeleton and the Labyrinth of Gods by this_is_my_alt
Fandoms: Undertale (Video Game)
28 May 2026
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As a necromancer, you’re used to suspicious stares and whispers of heresy from the townsfolk. It only gets worse after you’re killed and walk Ebott Empire as an undead skeleton. When you hear rumors of a strange settlement that worships the undead, it’s too tempting to resist. The locals treat you better than you’ve ever been treated. That is, right until the moment where you’re dressed up and tied to an altar as a sacrificial bride for their skeleton gods.
Despite their advanced technology and magical prowess, you’re doubtful of their divinity. What kind of gods blush whenever they see a bit of bone?
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Doomsday prep has always been necessary in my opinion. If not for your time, then for another's time. So I got married young, to a much older, much richer man, waited a few years for him to die (cancer, so sad), and collected that money like candy at a parade. Then I picked out a nice place for a bunker, and had that thing built in another few years. When Monsters busted out of the mountain nearby, turning some Humans into Monsters, I was only slightly surprised the government's decision was to fucking nuke them all. Now I'm closing the door, and I see people in the distance waving their arms, yelling. I should just close the door, I don't know them, but I don't think it's fair to leave them out to die.
Author's notes, kinda:
Gonna be just Horror, Fell, and Fell/Swap variants.
Characters like Sans, Toriel, Asgore, Frisk, and others are really only mentioned, except Horror Sans.
Papyrus variants are more like different people in this, than variants of the same person.
Also, I don't really like Swapfell Pap (Purple) so sorry, but he might only be there for drama, not for a relationship -
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When the monster beneath Mount Ebmott first surfaced twenty-five years ago, it did not arrive like a warning—it arrived like a wound split open in the world. No one understood what followed.
Soon after, humanity began to change. Ordinary people found their bodies shifting, senses sharpening, bones reshaping into something no longer entirely human. They became known as Morphs. No cure. No explanation. Only transformation and the quiet fear of the unknown.
Panic came first. Then, uneasy adaptation. Society learned to bend around the Morphs, though never fully accepting what had been lost or gained.
At the center of this changing world is Faith, a girl whose life was once painfully ordinary. Everything shifts when her older twin brothers, Cain and Daim, find themselves tangled with a skeleton monster family—beings newly emerged from the Underground, as unfamiliar with the surface as humanity is with them.
What begins as an unlikely meeting between two strange families slowly unravels into something larger: a collision of worlds, secrets, and truths buried far longer than anyone realized.
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Continuation of "Pretty Like A Car Crash"
Crumble must prove to the facility that she can handle whatever is thrown at her, except sometimes the problems come from the skeletons that are supposed to help her.
It's up to her to prove everyone wrong.
Series
- Part 2 of Crumble and her Crumbling Life
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Valerie Helvetica is the heiress of a wealthy monster family based in the industrial boom city of Mt. Ebott, where endless opportunities for entrepreneurial endeavors are equally as prevalent as infamous crime rings that plague the cities civilians.
Valerie knows what her duties are; be prim and proper, act polite and with dignity, and marry into a family that will advance the Helvetica name in both wealth and status.
Valerie knows what her duties are. She just chooses not to follow them.
She’s a crude, arrogant prick with a smart mouth with every intention of being so insufferable that no proper suitor in their right mind would want to marry her.
Everything was going according to plan. Until her father finds a suitor more than willing to give her a chance.
(In which I self indulgently debut my most beloved OC, Valerie, and the evil man that I play barbie dolls with. I make them kiss. Shoutout underfell sans and ficthefella for owning the underfell concept.)
- Language:
- English
- Words:
- 1,584
- Chapters:
- 1/?
- Kudos:
- 4
- Hits:
- 57
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Escaping humanity isn't something everyone thinks about, much less wish for- but the fae realm is notorious for allowing those who wish for safety into its mysterious home.
You're going to find yourself anew, rebirthed into the fae realm with more power then you assume. Hopefully you realise sooner rather then later how much power you hold at your finger tips.
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This is a bad sans reverse harem fic, whilst MC is an oc of mine, it can 100% be read as a reader-insert fic.
Bad Sanses - Nightmare, Horror, Dust, Killer, Cross and Error.
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Original Faeu belongs to Valrayne-faeu on tumblr!
- I've made a few changes to the Faeu, so please keep aware of that and the tags. -
The Last Scholar Of Magic by Alphys Manga Supplier (Kai2SHPIWD)
Fandoms: Undertale (Video Game)
23 Mar 2026
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A skeleton woke up one day in a large abandoned overgrown grand library filled with books about souls, magic and MONSTERS. Fearing the outside world, they assume the role of the sole librarian. They tend and maintains the books to the best of their ability, longing to find another being like them… Their wish comes true when the only human they trust to enter their library brings back the race they have only read about.
Will they ever find out why they woke up in that library? Why do they feel such longing? You'll have to find out yourself.
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Sans tries to fix his mistake, and bring all his versions back to thier own worlds. But working hard together with Stretch they yet again bring somone to thier world another fail attempt. But there was somting different, it wasnt versions off them and it was just one skeleton who been brough up here. They have a nickname and they always act odd and always have a pocker face. Just not really reacting when they should react...
(Gonna add my drawings to the chapters!)
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A strange fracture in reality has upended your world, landing you in the middle of a snow-laden forest with nothing but questions—and no memories to answer them. The cold bites, yet something deeper unsettles you, a feeling that you weren’t meant to be here. Shadows watch from the trees, and every step only deepens the mystery, leading you to a pair of odd yet oddly familiar figures who claim they found you by chance. As you journey through this bizarre world, fragments of your identity remain just out of reach, and the unsettling sense of belonging—and not belonging—grows ever sharper.
Who are you? And what dragged you here? In a world where even laughter holds a double edge, piecing together the truth might be your only way home, if you have a home to go back to.
(Will Be Fixing Summary)
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A strange phenomenon came with the barrier breaking in Mount Ebott in which certain humans awoke to find themselves turned into monsters. You just so happened to be one of those humans.
After being left alone so long can you learn to forgive the family of skeletons that took you in?
Will you be able to move past your human life and accept this new life?
Do you even really have a choice?
I'm going to be honest, this is more of a self-insert. HOWEVER, I did leave mc unnamed and referred to as they/them so anyone can imagine themselves as the mc. also... im really just writing this to rekindle my love for writing after having an awful collage term where my writing professor tore down every piece I was proud enough to give her and made me feel insecure about my writing :/
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You watch them suggest names and argue with each other as you stand there dutifully like a newly-adopted dog. Rus sidles up close to you and looms over you like a hanging specter. His smile does not look friendly.
“How about..Snowy,” He suggests, his grin widening at the twitching grimace on your face.
How to survive a blizzard and nonconsensual teleportation to a dilapidated sci-fi basement.