Undertale Stories

One day, Y/N was playing Undertale. Y/N finished the game, both genocide and pacifist. After the second pacifist ending, you wondered how life would be like IF the monsters actually were real. If the monsters would actually roam around and act as humans. That thought soon changed. ( Book Cover Picture is NOT Mine. I found it on google. Credits to the owner. )

Reborn as the guardian of positivity, you find yourself in a strange new world, uncertain of what it may hold. Navigating it isn't easy with gods like Nightmare and Error trying to strike you down every step of the way. But unlike the previous Dream, you have nothing to lose, and are determined to forge a better path than the soul whom you have replaced. Cover art by the wonderful @Nymara379 on A03 ♡

A new hope has awakened in the world of RWBY Y/n a normal boy is Isekai'd into the fictional world of RWBY and is determined to rewrite fate, How will he change the story I got no clue, how bout you? All RWBY characters are owned by rooster teeth And all other characters are owned by their respective owner's [Slightly Slow Uploads]

In this AU, Undertale monsters live amongst humans in the One Punch Man verse. How will it all play out? (THIS IS DIFFERENT THAN PUNCHTALE!!!) As an AU, characters may differ from their canon counterparts.

Abandoned on Mt. Ebott at the tender age of five, young Harry's unsurprisingly died, but Death's always had a weird relationship with his variant... Meanwhile, before Flowey's revival as souless talking flower, Sans makes a discovery under the mound of snow, Papyrus has always wanted to be a big brother anyways. *Edited Summary (29/09/2025)

Working at a luxury hotel has its advantages- the pay, discounts, seeing celebrities. It's not all sunshine and rainbows, but you enjoy it! As someone who overanalyzes things and processes things different then most normal people, you find the mind numbness of the job very relaxing. Not too exciting, not too boring, just nice and simple. Unfortunately, you're really good at your job. And that causes you to accidentally overhear some intel- causing you to be kidnapped and sold at auction. What happens when a perfectly composed and professional monster loses his rational thinking in her presence? What happens when they come together to stop forces beyond their control- beyond their power? _________ Art doesn't belong to me.

TW: Swearing and slight gore Y/N reincarnates in the anti-void as a Voice... Will he befriend error or will they make them hate their guts? And will they meet other people? Only time will tell. Hello, this is going to be my first book and idk if it's going to be good so meh :v This story was inspired by transported as a voice by Virus_bOi, I obviously do not own undertale and I don't keep up that much with the fandom, so some personalities might be different, but hey. I can just say that it's a different multiverse ¦ ] The cover image is from Shira Wolfiecute on tumblr

Sans and the gang escape the underground but the world outside doesn't accept them. They have to disguise themselves. Inspired by the glamours In A Wolf Amongst Us. Multiple Relationships, drama, romance, angst, despair, adventure and craziness ensues.

so I oh ways want to make a reborn as killer sans, but we're mentally unstable, of course, due to the rest and our past memories, which we can't remember what we were anyway! We know everything and everyone, so why not mess with them. This going to me fun!!!

It all started with the sound of a knock, And evolved into a joke, The jokes continued until they became friends, And the friendship turned to a relationship, But soon life came into play, The king came along, Thinking he could sweep the love away.

Living on a steady diet of caffeine, sugar, and sheer will is not a healthy lifestyle. But how else can you keep up with teammates that need no sleep, no food, and who expect the same of you? Blue has no intention of falling behind, ever, for any reason. But his lifestyle is starting to show to others. What happens when the enemy intervenes for good?

Seven years ago, monsters were finally free. Seven years ago, a human was forced into bondage. Seven years ago, this world ceased to be the tale we all knew and loved. Now, the butterfly flaps its wings. How would this world react to a presence never meant to be in the script? How would it react...to You. After all, you were Not Meant To Be. Author's Note: Welcome to my very first story! Not Meant To Be is an Undertale Reader-Insert/Chara fic, with emphasis on a plot, written purely for fun. It is heavily inspired by other works in the fandom. Rated Teen (T) just to be safe. Might bump to Mature due to (little) explicit language, violence and fantasy violence, and suggestive/sexual themes. I do not own Undertale or its characters. Enjoy!

•Okay this is my first fanfic so bare with me here•Frisk has just rest from almost completing a Genocide route. She didn't want to do but Chara had other plans. Frisk blames herself(yes I made her a girl get over it!!) She blames her self for not being strong enough to stop Chara to anyone. She was only able to rest because Chara was too shaken by her fist time fighting Sans to hold Frisk back. Can Frisk learn to forgive herself, and will Sans forgive her as well? Welp that's what your to find out isn't it?

These four walls are the only sight he's ever known. There is nowhere to escape the prying eyes that watch his every move day after day. Surly, there has to be something better beyond this gilded cage? Started 2/25/25 Finished

You've fallen down in a world that is unfolding. You meet a chipper monster named "Temmie." They aggressively protect you with a great deal of love, and they push you to at least carry around the Toy Knife just in case, but you're not interested in murder. You don't remember anything after the fall, but, you just know you will discover yourself as you go along. Maybe you'll even get your memories back after getting past the Barrier. But there's problems. Monster problems. They want you; you're their last SOUL. But there's just one last monster that you know you can trust, other than Temmie... He's purple, round, and energetic. His brother likes to steal your money and seems to be more neutral. But he's got a secret, and it's just KILLING. It's just DYING to be spoken out. It seems like you're not the only one who's forgotten who they were. ~~~~ PLEASE! BEFORE READING! KNOW THE DIFFERENCE BETWEEN FELLSWAP AND SWAPFELL! (Hint: Swapfell is basically the fell version of Underswap. The main color is purple instead of red!) Thank you! There are a lot of tips on Amino that can help you understand. Anyway, thanks for reading! (Cover: @PoppiGhoul)

Y/N wasn't anyone special. With 21 years under her belt, she went through life like anyone else. Until she was picked out from the rest. Read your way through the Underverse as Y/N gets into the worst of situations. Can she herself survive whilst also keeping those she deems her friends safe?

???: I want a fresh start and you seem like the perfect specimen to use for this story, Y/n L/n. (So in short the first story of this still happened but ???(me) Erased the memories of it happening making it all happen again I hope you guys enjoy this story till next time.)

The word RUN still echoes long after the sound should have died. Not in his ears- in his bones. Each step forward drags two shadows behind him. One remembers her laughter. The other remembers her teeth. Sometimes she's there in reflections: whole, breathing, eyes soft with recognition. Other times the glass crawls with that thing-limbs bent wrong, smile too wide, voice layered over itself like a broken chorus. He doesn't know which version hurts more. The balance demands sacrifice. The world demands forgetting. But grief is heavier than any law, and hope- hope is a stubborn parasite. "If you can hear me," he whispers into the dark, into the places where light goes to die, "I'm still looking." And somewhere, between the shifts, between the screams and the silence, something hears him. Something remembers being her.

The Rogues are not the only ones who can show the Future. They're not even the best at it. Player isn't blind to the multiversal calamity unfolding, and while it is entertaining, it is not a story they wish to risk playing out. To be more specific, they don't want to risk anything but a happy ending. Therefore, they decide to indulge the cast of the show in a few spoilers. Aka: Indie Game Characters watch Indie Cross

Cover image made by me. Someone meets their end too soon and meets someone who gives them another chance to live a more fulfilling life. One that they would enjoy despite the problems that may come along. In other words, reader becomes Error.