1 - 20 of 114 Works in Alternate Universe - Swapfell Red (Undertale)
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You are on death's bed, there is no denying it at this point. Your good friend listened to you rave about an upcoming otome game you have been desperate to play since you've heard of it's creation. Only to sadden when your prognosis would keep you from seeing it in your lifetime. Well this good friend manages to get you a copy. So who would have thought that when you eventually passed on, you'd wake up as a healthy you? With goat ears, nubby horns, and a cute fluffy tail? Also a barrage of skeletons waiting on you hand and foot, calling you their queen... After playing many routes, there is one thing you are sure of... To make sure Black doesn't kill you like he does in the game... yet you don't seem to understand the stark contrast of yourself vs the queen as the skeletons do... and if you aren't careful? Black and the others will fall head over heels for you.
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Heat of the Moment by FandomWorld9728
Fandoms: Undertale (Video Game), Swapfell red - Fandom, Fellswap Gold - Fandom, Underswap - Fandom, Swapfell - Fandom
01 Sep 2025
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Being half demon and half human was hard. It affected your life in interesting and traumatic ways. Luckily for you, you had a pair of skeletons who would help you through whatever life threw your way. Only, things got more complicated when different versions of them began to show up.
Series
- Part 9 of Undertales Across the Multiverse
- Part 9 of Papyrus/Reader Fics
- Part 7 of Sans/Reader Fics
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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
31 Aug 2025
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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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What happens when everything changes? Everything is the same but it isn't.
An entity from the stars descends to earth and disguised themselves as human. They witness history in this new era of monsters and humans, while also dealing with the demons that dare dirty the earth with their presence.
What happens when you step into the battleground from one universe, only to win and come out into another parallel world, except you’re the protagonist?
You weren’t one for the spotlight. You loved your sister, even if she wasn’t one by blood. You only wished for her well-being and happiness. Except here… she’s gone. And now you have to take her place and stand under the limelight as you walked your path in her place - the protagonist.
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I DON’T CONDONE MY WORKS TO BE TRANSLATED, REPOSTED AND/OR FED TO AI.
9/1/25 — thank you for 600+ hits!
Series
- Part 2 of Still As Stone AU
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Here Comes the Bride by FandomWorld9728
Fandoms: Undertale (Video Game), Underfell - Fandom, Underswap - Fandom, Swapfell red - Fandom, Fellswap Gold - Fandom, Echotale - Fandom, Horrortale - Fandom, Something New - Fandom, Dusttale - Fandom, Reapertale - Fandom, Aftertale - Fandom, Outertale - Fandom, Swapfell - Fandom
28 Aug 2025
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You were so excited to finally get married to your long time fiancé, only for him to leave you for another girl with nothing but a note. Lucky for you, your two best friends were there to help you through this rough patch of your life.
Series
- Part 12 of Undertales Across the Multiverse
- Part 8 of Papyrus/Reader Fics
- Part 8 of Sans/Reader Fics
- Part 1 of Here Comes the Bride
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You think you've finally reached peak in life.
You have a lovely home, a great paying job, wonderful supportive friends, your loving boyfriend and your best friend! You were practically living in your dream life, or so you think. That's right! Everything came all crashing down when monsters surfaced, breaking the barrier.
Your town— or well, Ebott City as they now call it, were infested with monsters that came straight from underground. You're quite the social person so why not try something new, like talking to a monster, perhaps!
Your boyfriend is a specist. He also became nasty, and so did your best friend! Fun, am I right?
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Every day merges together and becomes the same. Same rush hours, same schedule, same rehearsed food advertisements and same news. Learning that monsters existed and were integrating into human society was new, and seeing your first monster customers now that they’re allowed trips outside of their gated community?
Every day might not merge together anymore.
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"Now you've used up all your luck,
it's time to get what you deserve.
I'm holding out for 𝐊 𝐀 𝐑 𝐌 𝐀,
I'm holding out to watch you 𝐁 𝐔 𝐑 𝐍."-Karma by VocaCircus feat. Kagamine Rin
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It all started when your Dad got into that nasty car accident, causing you to have to live with your Mom and her boyfriends (yes, multiple) until he gets better.
Now? You just wish he never left the house in the first place.
Series
- Part 5 of Undertale Stories
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12 Skeletons, 3 Ghosts, 2 Harems, And A Gamer by syst3m_of_3rr0rs
Fandoms: Undertale (Video Game)
10 Aug 2025
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Summary
You're thrown into the world of your favorite fandom/game where you end up living and interacting with the most cliché storyline in the entire universe of anti-harem fanfictions.
That's it.
That's all it is.
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Ever wonder what it's like to live in the world of your favorite fandom with your favorite characters? No? Then this book ain't for you. But if you have, then strap on in and enjoy the ride guys, gals, and nonbinary pals, cause this is gonna be the adventure of your life!
(WARNING: Slow updates, [probable] short chapters, major chapter editing. Also, some characters might be a bit OOC.)
Previously titled; "It's sad, I'm sad. I miss you. How did this happen?"
Series
- Part 3 of Undertale Stories
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Summary
The Serif household has been through many odd scenarios. After all, they are entirely comprised of other versions of the same two skeletons who got stuck in the world they have called home for six years, unable to return to their worlds and thus forced to carve out a life for themselves until further notice. All things considered, they found their stride and adapted to the ongoing weirdness of universe hopping.
That is, until she arrived. Flora, a woman so out of left field and disrupting their normality, appeared in the basement, battered and bloodied to hell and back. Stuck like all the others who had appeared before her, the Serif household is forced to accommodate her until she stabilizes, slowly beginning to get to know the lackluster and stone-faced woman who ensures they don't injure themselves via stupid means.
Few expect her to open up. Fewer expect her to accept becoming friends.
None expect for any of them to become much, much more.
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Darkening Days by Maiuo
Fandoms: Swapfell - Fandom, Undertale (Video Game), Swapfell red - Fandom
30 Jul 2025
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Coming Aboveground has been difficult for the last couple of years, leading to the separation of Humanity and Monsters alike. Edge of a War against the two species about to clash, a mystery comes forth that seems to be taking both sides in the darkness...
Waking up, you found yourself stuck to something you really didn't want...
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In a world where it collapses without you by me_paina for Kamisori
Fandoms: Undertale (Video Game)
10 Jul 2025
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Life hates me, and so that's why I hate life back. Some people will say it's just satisfaction to do so, or some sort of mentality of: you hate me, I'll hate you back.
But no.
Not for me.
For me, it's the line between life and death. A rule I must follow because...
Nothing will ever go right for me, no matter how evil or heroic I be.
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What happens if I replaced Y/n with Delta, my demon oc? How would the world of Zombietale change?
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Delta is trapped by a facility that promises to make a cure. Spoiler alert: They didn't. Delta decided to escaped for good, only to meet skeletons three years later.
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Check out the first chapter for background information
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Hello! So you know me by now. If ya haven't already I highly recommend reading Kamisori's story Zombietale. Even if the story and plots are completely different maybe you can get some sense of (a few) of the character's personalities.Zombietale is a really good fic! I love it!
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11/? - First chapter doesn't count(Zombietale belongs to Kamisori)
(Writing belongs to me (Me Paina))
(Drawing belongs to me (Me Paina))
(Undertale belongs to Toby Fox) -
A Little Honey with that Money by absurdmagewrites
Fandoms: Undertale (Video Game), Swapfell-Fandom, Underswap-Fandom, Underfell-fandom, Fellswap-Fandom, Fellswap Gold-Fandom, Horrortale-fandom
09 Jul 2025
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Stretch, and Money have been best friends from the moment they met. They just understood one another completely, but now are they something more? When a small twist is thrown into their lives, will they be able to cope, and end up happy together, or crash, and burn?
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We Need A Fucking Exorcist! by Ray_jaykub (Super_Shiny), Super_Shiny
Fandoms: Undertale (Video Game)
30 Jun 2025
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Some odd stuff has been going on in the Seriff household. Y/n has random bruises, Papyrus keeps brushing things off, and Sans has been in that basement for a couple of days now...
Surely it's nothing too crazy!
How wrong you were
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It all started with a housewarming party where only you showed up. Now, you're tangled up with multiple skeletons and a woman that hates your guts for no reason. As much as you want to act like you don't care, you really do, so what do you do now?
It's not like you can survive on your own.
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You're just a normal(?) human working at the local grocery store.
Why are there so many skeletons?
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You woke up as a princess one day.
Apparently it comes with 'four skeletons as personal guards' package deal.
Being royalty is more complicated than you thought it would be.
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You are just someone who loves the story and the characters of Undertale and its AUs. You never imagined you'd end up living with 8 skeleton monsters. Except for one problem.
None of them trust you.
You would have to prove yourself to them. All of them.
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He though he was going to die, he should be dead. but instead he's standing here, in an old basement staring at a bunch of walking talking skeletons. Needless to say he is not pleased.
Series
- Part 1 of New world, New me?
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Hypocrites, Hypocrisy, and Hurt by Valley_Of_The_Restful
Fandoms: Undertale (Video Game)
21 Apr 2025
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It was hard you wouldn't lie, Bouncing from job to job scrapping together whatever money you could get to send to your family. Finding yourself barred from countless jobs just because of your past but you couldn't fail not yet….
So you worked and worked, finding every odd job you could, even dabbling back into things that you swore you never would again. But it didn't matter because you had no other options, spiteful to prove every last person wrong. Every single dammed person who said you couldn’t make it.
It didn't matter if you found yourself exhausted cold and hungry more days than not or if you found the scars from encounters gone wrong piling up, you were here to stay. Because you were a lot of things at the end of the day but you were utmost, stubborn, spiteful, and determined.
Series
- Part 1 of Hypocrites, Hypocrisy, and Hurt Series