Undertale Stories

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.

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

Disclaimer: I don't own mha or Asriel they belong To their respective creators

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

(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)

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.

"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

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

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

I have too many memes so here

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

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)

On a horrible day, an Ink from another multiverse stole Palette and threw him into the void. In another Dimension not multiverse, a human couple find an abandoned human newborn. Harry woke up from Death, chose to live. Choosing his own Destiny. Destiny offers this lost soul to go home.

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!

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.

reader with sans power and attitude being izukus brother in mha.

Here are some story, crossover or scénario I have. If it inspires someone, I'll be happy. And who knows, maybe one day I'll write one of those stories, or maybe someone else will.

Nightmare, The King of Negativity, known for being cruel and torturing people. But oddly enough he feels lonely, I mean it must be hard when his only friend Error is always working because of the stupid Star Sans. One day Nightmare feels an odd negativity that he hasn't felt before and checks it out, whatever he faces in this AU he'll have to deal with plenty of other times. But luckily beside him is his Bestfriend (Error) ready to step in and help whenever he isn't busy. (Errormare) Warning: This is NOT the canon version of these characters and the bad sans (besides Nightmare and Error) will be kids. (Basically Mama Noot Noot AU)

Same description as first story Izuku yagi neglected and bullied becomes W.D Gaster and Uses Science to Make his sons Sans and Papyrus