Undertale Stories

It has been 10 years since the monster broke free from the barrier, and since then monsters and humans live together in peace. But for some reason, monsters have somehow got a mini version of themselves, no one knows how or why it just happened. And for some reason, the skeleton bittys are popular because of their many different versions. You are a 19-year-old girl who lives in New York City in your apartment the problem is that you're all alone( if you're wondering if your family is alive, you just live far away from them), you have a small dislike for people. You wish you could get a Bitty to hang out with it, but the problem is that it costs a good amount of money. So you could never get one or so you thought until one day you find a strange box. This is my first time posting here so I hope you enjoy it! Also note there is some swearing. Note the cover does not belong to me. It came from https://undertale-au-fanon.fandom.com/wiki/Bitty!_Sanses By The Edit Lord Also I do not own any of the characters. Undertale belongs to Toby Fox.

(TW: unaliving thoughts and memories at the beginning. It gets better over time, don't worry! Trauma is difficult to overcome...) You didn't want a second chance. You didn't want to survive. You wanted the sweet release of death. But it seemed like the universe was far too cruel to allow you even that. It took away your memories, your free will to choose whether you live or die...hell, it took the one thing in life you owned! Your own name! And now it seemed like you had to live yet another cruel life, doing things you never wanted done to others. But...at least you could do things your way. Maybe this second chance wouldn't be so bad... (Reincarnated as Nightmare Sans, but unlike other stories, you have no clue what Undertale even is) (WE REACHED NUMBER 1 IN THE UNDERTALE TAG YOOOOOOOO) (9/13/25)

I have too many memes so here

This isn't a normal Y/N story the bad sanses do a raid on an illegal auction of many rare, dangerous, and illegal things. but after the dust settles, killer finds what he believes to be a weird mutated cat and decides to take it back with him art by me. my first book, and feel free to correct my spelling in the comments Y/n means your name Y/fc means your favourite colour Y/fm means your favourite type of meat Y/hl means hair length Y/hc means hair colour Y/sc means skin colour Y/ec means you're eye colour

- • x BLOOD AND GORE WARNING x • - Error stops, Where is everyone? It's so empty here... walking through the ruin halls he found nothing. no one, not even a whimsun. Perhaps this is a Dusttale AU, it must be! Error thought as he finds himself in Toriel's basement, there was nothing, not even dust or corruption. walking out into what is now Snowdin town.. wait, that fast already? That was new. A snap and rush. why is everything so different now? ----- A rush of panic waves through Nightmare's brother, how unusual. Nightmare takes the gang to this AU, knowing Error is here. he looks around looking for the said emotions, not feeling any in the area was wrong. No one was here. a rush of panic, fear and guilt calls to him and he runs towards it. WHAT THE HELL IS HAPPENING?! ----- Credited to Harrish6, who's account is found on ao3, FanFiction. Net, And Wattpad. I do not know if they are on quotev, but I've found them on those platforms. They're still continuing their stories, and everyone credits them for the inspiration of creating the forced god part of the undertale fandom. I've ranked 1 in #fgoderror #sans and #Harrish6 I've ranked 10 in #undertale A big achievement on me! I'm so proud of myself and thank you for everyone reading this book and getting this here. (I don't remember the dates T-T but I published this fanfic at the start of September so it was around September-October of 2020.)

The player or you have transmigrated into the world of the digital world, where indie games like omori, yume nikki, little nightmares, undertale, hello charllote or digital circus, gravity falls or etc...

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)

Chara and Y/N were childhood friends, knowing each other since kindergarten. Unfortunately, one had to move away, leaving the other alone. When they returned, they came back to see their childhood friend they missed so much. But the one they met was entirely different from what they remembered. Inspired by : Mikoto-chan doesn't want to be hated from Pt. Story started on : 14/01/2026. Thumbnail by : @kohaku_chara on Twitter (Or X) : https://x.com/kohaku_chara/status/1627648846443728897

Why Toriel, with her creepy obsession with the fallen children and in need of Therapy. Was it truck-kun? They'd rather like to know, and really hoping this is cannon and no Genocidal children At least its after the run to the ruins portion they took over Co-written with Philippaki!

"the healer likes t' sleep. like, a lot." Axe looks at the sole female AND human member of Nightmare's subordinates. She was only ever awake for about 8-10 hours a day, rarely ever 12, it was both fascinating and irritating at the same time. He was damn sure humans would be awake for more hours than that, he even asked Murder at the time if it was normal. Said skeleton didn't give a single care though, his words: "who cares, makes her more tolerable. 'sides she gets her job done." The cracked skeleton just couldn't shake off the feeling that there was more to it than meets the EYE. ━━━PHOTO CREDITS: Whale鯨豚 [@Whale5511] on X! ━━━MOST NOTABLE RANKING: #1 in sansxreader, horrortale, something new and badsanses on 23/12/2025 #1 in undertale on 25/12/2025 #3 in bittersweet on 24/12/2025 #5 in reader on 24/12/2025 #19 in sans on 23/12/2025 ━━━━━━━━━━━━━━━━━━ DATES PUBLISHED: 001 ━━ July 29th of '25 002 ━━ July 30th of '25 003 ━━ August 1 of '25 004 ━━ August 3 of '25 005 ━━ August 6 of '25 006 ━━ August 8 of '25 007 ━━ November 8 of '25 008 ━━ December 22 of '25 009 ━━ December 23 of '25

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

After falling in battle against Chara and losing everyone in the Underground, Sans awakens in Mewni, a strange world ruled by ancient magic and wild creatures. For three weeks he survives alone in a cave as a hermit until witnessing an important event: the birth of the kingdom of Mewni, where Glossarick grants the first magic wand to the settlers, beginning the history of the kingdom

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

A young child fell into the Underground once again Back to the bed of flowers, where it all began What will they say? What will they do? "heh...yer not Frisk...are you?" Disclaimer: I own nothing except my OC. Everything belongs to the one and only Toby Fox

You, Y/N the human has fallen down from the surface...well..not on accident. It was on purpose. He/She was very curious about the lengend about the monsters under the surface...Will He/She survive? Will He/She meet the seven deadly souls?.....Depends.....right? (The photos belong to their owners and....I will ignore A/N's as much as possible.)

Basically dis is exactly what the title says it is xD I am ze magnificent Author-cha- I MEAN SANS!! Enjoy~ :3 ♡

In this Undertale and One Piece crossover, FGoD Error-Sans, a Force God of Destruction, commits suicide by jumping into the Void to escape the cycle of saving the Multiverse from Ink-Sans. Before his leap, witnessed by his brother Fresh, Error grants his friends and lover, Blueberry, a "painless death," effectively dooming his original reality. Instead of perishing, the Void transports Error to the One Piece world, where the fall stabilizes his glitches. He is discovered by Monkey D. Garp, who adopts the "magic skeleton" as his son. Embracing his new life, Error begins calling Garp "Padre" and is introduced to Ace and Luffy. Viewing the boys as "soulings" (monster infants), Error's maternal instincts override his destructive past, leading him to protect and train the duo as his own. Note I: I do not own One Piece or Undertale. One Piece is the property of Eiichiro Oda and Shueisha, and Undertale is owned by Toby Fox. The FGoD Error-Sans concept belongs to its original creator. This is a non-profit fanwork created for entertainment purposes only. Note II: This is a crossover fanfiction. I do not own the characters or worlds of Undertale or One Piece. All rights belong to their respective owners. I am simply playing in their sandbox

the bad sanses do a raid on an illegal auction of many rare, dangerous, and illegal things. but after the dust settles, killer finds what he believes to be a weird mutated cat and decides to take it back with him art by me. my first book, and feel free to correct my spelling in the comments

For centuries, monsters have been buried beneath the earth, trapped by a magical seal that only seven human souls can break. But the Royal Scientist is tired of waiting for the surface world to fall. To shatter a barrier forged by the strongest human mages in history, he has decided to stop following the rules of the living, and start rewriting the laws of the dead. From a sliver of ancient bone and a vat of concentrated magic, Subject H4Y.D3N is born. He is a ghost of a god-like race, a draconic monster brought back to a world that has forgotten his kind. But life engineered in a cold laboratory comes with a price. As Gaster carves the path for two more "vessels" to follow, he realizes that power is not easily tamed. Toby Fox is the creator of undertale, I only created this AU and Hayden is my creation

Join (y/n) the second youngest sibling of geno,error and fresh,through her adventures in the daycare.