1 - 20 of 3,527 Works in Reader Is Not Frisk (Undertale)
Navigation
Listing Works
-
Tags
Summary
Wake up buried in snow, alone, and with no memories?
Check.
Kepp seeingg numbers, words, and text floating around every object and surface as far as the eye can see?
Also check.
Why does every person he meets say he needs help?!
His perfectly fine if you ask him."I wonder what determination taste like"
Note from the author:
This is my take on Fatal Error—a much more none canon, this isbt even OOC this is just straight up diffrent person with the same name, amnisiec version of him.
He’s also not fully canon-compliant in terms of power scaling and has and maybe different origin and personality.
It’s my reimagining of him.
Glitchy, lonely, and filled with questions, bad puns, power to blow up annoying people and some more puns. -
Tags
Summary
When replaying Deltarune Chapters 3 and 4, Reader gets a strange update on their Switch.
Wacky shenanigans shall occur, and chocolate chip cookies shall be disrespected.
-
Tags
Summary
After spending all your life in that damn facility, you come out of it and have no clue about anything, and you just want some friends and family, and maybe someone to love you.
My brother had given me the idea for this fic, and I really wanted to write it, hope y'all enjoy!
-
Tags
Summary
They say life is full of surprises, but [Name] never expected to end up in an entirely different universe, one filled with monsters, souls, and magic. But this isn’t some happy fairytale; it’s reality. And reality bites.
Adapting to this strange new universe feels impossible, especially when the skeletal monsters causing you trouble also happen to be your roommates. And 'passive-aggressive' doesn’t even begin to cover it. Still, no matter how lost or out of place you feel, you refuse to let go of hope.
After all, if life can surprise you once... who’s to say it won’t surprise you again?
-
Tags
Summary
You fell into the Underground years ago. Being a part of society as an adult with a job to maintain was hard enough as is, but the gold-toothed skeleton and his tyrant of a brother that tormented you made shit a lot more difficult.
See, that was hell; but now you're working for an oozing, skele-octopus creature who's got a thing for negativity. You aren't sure if this situation is better or worse, but considering you're being forced to work closely with Sans, it's probably worse.
-
Tags
Summary
ʙᴇᴄᴀᴜꜱᴇ ᴇᴠᴇɴ ɪꜰ ᴡᴇ ᴀʀᴇ ᴀᴘᴀʀᴛ, ʏᴏᴜ’ʟʟ ꜱᴛɪʟʟ ꜱᴇᴇ ᴛʜᴇ ʀᴇꜰʟᴇᴄᴛɪᴏɴ ᴏꜰ ᴛʜᴇ ᴍᴏᴏɴ ᴏɴ ᴛʜᴇ ᴡᴀᴛᴇʀ ᴀɴᴅ ᴛʜɪɴᴋ ᴏꜰ ᴍᴇ, ᴛʜɪɴᴋ ᴏꜰ ᴜꜱ.
-
Tags
Summary
Sans looked at the ceiling in pure boredom, unable to sleep as he listened the guards opening the gates of the inmates one by one. It didn't take long for him to hear a guard slamming his club against the bars of his cell.
He'd been told a doctor wanted to do check up on all the inmates, so he didn't really question it when he was forcibly pulled out of his cell so early.
Being pushed around wasn't fun, but at least it was exciting to meet new people that weren't convicts. They had a tendency to be assholes and not appreciate his humour anyway.
"Sans?"
He saw you, with half on your face covered by a mask as your eyes squinted in curiosity.
You were looking at him so intensively, it almost made him feel uncomfortable.
"Please, have a seat."
-
Tags
Summary
This is my first fic, so please be gentle.
You live in a city in the 1920s, and it is overrun with mobsters. Because of this, you're extremely cautious and like to stay informed about what is happening around you, but you come across a man with quite the... unique mindset for a mobster. You don't trust him at first, but he'll win you over eventually.
He will make sure of it.This is short for now; I will be adding more later, as I'm currently sleep-deprived.
- Language:
- English
- Words:
- 744
- Chapters:
- 1/?
- Kudos:
- 3
- Hits:
- 23
-
Tags
Summary
You’re a scientist! Yes you! And you’re going on a trip through the multiverse! Dw, you did it on purpose
-
Tags
Summary
Monsters have appeared from a mountain, in your town! Interested in this new development you head home with high hopes. Sadly it seems humans will be humans, and for some reason you keep getting caught in the cross fire. Luckily you've made some new friends to help you out along the way!
You were just about to head into the nearby town when your phone went off, it was a text. From Otto of all people. A video of him, and what looked like monsters walking behind him. "You should come home (Y/n), things just got interesting."
Reader is female (sorry) there will be smut at some point, don't know when though...
Series
- Part 1 of Blood N Bones Stuff
-
Tags
Summary
It was all great. You had friends, family, a place to call home. Until the Human child fell and ruined everything. Now? There’s nothing left but a desolate Underground for you and your Husband to be reminded of the past.
That is until the ground breaks from under you and spits you and your husband into another universe entirely.
-
Tags
Summary
You're a grad student at a house party. How many skeletons are you running into there? At least one you didn't expect.
(This explains nothing. Please read if you like Sans/Reader romance slice of life with plot, character relationships, fluff and eventual smut. Underfell headcannon is being used.)
(Time for a second note to reemphasize PLOT. Drowning in plot. Plot for days. Send help.)
-
Tags
Summary
Life sucked, that's how all these start out, right? well they are true. life fucks you over, and just as you get back on your feet will do it again.
you loose your job, your apartment, and your fiancé cheats on you constantly. you say fuck it all and go to the safest bar for any woman to get smashed on magical alcohol.you didn't know you'd end up sleeping with your new boss before you even were hired. or applied for it, but fuck it paid good.
(this is based of a kinktober one shot, you will get to suggest what you want to happen when i ask in the end notes! so please keep an eye out.)
Series
-
Tags
Summary
You were god's plaything. And you really, really, just didn't care anymore. Your life is aimless, and you really just want it to all stop. But it won't. So what do you do? Just start again.
Series
- Part 13 of Reader Inserts
-
Tags
Summary
Being the cleric of an inter-dimentional war isn't that bad once you get used to it.
When a skeleton falls from a portal into your bedroom, rambling about things you'd always thought were fake, what would you do with everything he says? When he claims he needs to win a war against his very own brother, his bone and marrow, who are you to turn down his request to be his army's medic? When you realize you're falling ill, who are you to tell him something is wrong?
-
Tags
Summary
It's six years after the Emergence, and while most of the monsters decided to stay close to the mountain on the west coast, slowly but surely a good few made it over to the opposite coast and settled down in Washington DC. Besides the King and Queen and their human child - relocated to the political center of the US for obvious reasons, you mostly see dogs, bunnies, and cat monsters integrating themselves among your coworkers and neighbors. Things aren't perfect, but they're improving day by day.
You have a stable job as a PR and Marketing Expert, a handful of close friends, and a stable and predictable routine.
When you randomly meet a brand new type of monster in town while late night shopping, you can't help but be frightened of him. After all- he's literally a living skeleton! Embarrassing, but at least you'll never have to see him again... right?
What happens when fate has other plans, and you just. keep. running into each other?
Let's find out.
Series
- Part 5 of The Butterfly Effect 💚💛🧡💜💙🩵❤️
-
Tags
Summary
You were finally getting your life back on track. Juggling college courses and a new job, you were slowly but surely rebuilding from the ground up, convinced the worst was behind you. That all changes when a magical summons you can't refuse rips you from your world and drops you into a house filled with powerful, skeletal monsters who despise you before you’ve even said a word.
To them, you are the arrogant and careless human who shattered the soul of their dearest friend, the gentle mage Lyra. They see you not as a person, but as a living tool—a magical "key" they require to heal the damage you supposedly caused. Trapped in a multiversal nexus with no way home, you must navigate a gauntlet of relentless animosity and suspicion.
Every word you say is twisted, every action is judged through the lens of lies you don't even know have been told. How can you survive in a home that isn't a home, surrounded by enemies who believe they are the heroes? And how can you prove your innocence when the true manipulator is the very person they've sworn to protect?
-
Papyrus attends college and you are his Human Tutor by Spectascopes
Fandoms: Undertale (Video Game)
22 Sep 2025
Tags
Summary
Papyrus, now a surface-dweller, decides he's going to go to college to meet human college students and become wildly popular. Being the first monster student at a human post-secondary school inevitably comes with a unique set of social challenges, but Papyrus is nothing if not capable! With the help of a new human tutor and his family cheering him on, he will acquire every degree possible and then some.
You are a part-time student who gets asked to help out the new skeleton monster you've heard screaming in the halls, and you couldn't say 'yes' fast enough.
-
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
21 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.
-
Persephone (Undertale AU) by Get8008
Fandoms: Undertale (Video Game), Multiverse-Fandom, Sans Aus- Fandom
21 Sep 2025
Tags
Summary
(Y/N) or Persephone for her Alternates, was created in a lab. Her mother being the reason of her sad existence, and one day everything changed (Y/n)'s universe was just an empty void. Then a familiar old friend came to her rescue, but he changed but so did she. She has to put up with the others who live with him and follow him, while she tries to find herself and her new 'freedom'.
Her past mistakes could be her downfall or help the monster she used to love.(This is an Au where you are the only variant of yourself, but your mother is like Sans that she has many variants and mommy issues come to play XD)