Undertale Stories

Dear, Nightmare, Cross, Error, Dust, Horror, Killer, Lust, Reaper, Geno, Ink, Dream, Blue Hey guys, It's me...Sci, So uh, I've just discovered something really cool. And I mean like, really cool. I was wandering if ALL of you could come down to my lab this afternoon so I can show you this thing. I promise you'll love it! -Sci- Nightmare frowned and looked at Error, who had been reading over his shoulder. He simply shrugged in response. "Eh, might as well, I'm bored and we've got nothing to do. What could possibly go wrong?" What could possibly go wrong...? Ehehehehe I wonder.

Timelines, genocides, deaths, ... It all stopped suddenly, leaving a hole in the stream of time. How will Fate repair it ? Will the souls participating in this stay themselves ? Story started on 21/03/2026 Arc 1 : The prologue started on 21/03/2026 ended on 08/04/2026 Act 2 : The Descend started on 16/07/2026

"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

When Frisk and her twin brother Y/N fall into the Underground as infants, the monsters who find them never expect the impact the children will one day have. Raised lovingly by Toriel, the two grow up sheltered in the Ruins, unaware that their arrival has already shifted the balance of the world below. As the years pass, Frisk becomes curious-drawn to a mysterious sealed door and the young skeleton on the other side named Sans. Their secret friendship blooms quietly, a flicker of light in the dark. But where Frisk finds warmth and connection, Y/N feels something stirring within himself-a faint orange glow deep inside his chest, the Soul of Bravery that he doesn't yet understand.

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 witnessing countless Genocide Routes across endless timelines, Sans finally breaks. Convinced that humanity is beyond redemption, he abandons everything he once stood for. By embracing LOVE and accumulating EXP, Sans transforms himself into the very monster he once warned others about. After reaching LV 20, he exterminates the entire Underground, defeats Omega Flowey to end the possibility of Resets, and wins a cataclysmic final battle against a Determination-fueled Frisk-a battle so devastating that it ends with the destruction of the Solar System. Believing he has finally erased humanity forever, Sans dies in peace. ...Only to awaken in Hell. Instead of eternal punishment, he finds a city overflowing with laughter, greed, violence, and indulgence. Humanity still exists as Sinners, seemingly free from the consequences of their actions. To Sans, Hell has failed its one purpose. If Hell won't judge humanity... He will. Armed with soul-destroying magic capable of permanently erasing Sinners, Sans begins a ruthless crusade through Pentagram City, becoming one of the most feared beings in Hell. While Princess Charlie Morningstar fights to redeem lost souls, Sans believes redemption is nothing more than a lie told to monsters and sinners alike. As mysterious disappearances spread across the Pride Ring and powerful Overlords begin vanishing without a trace, Charlie and the Hazbin Hotel are forced to confront a terrifying truth: This isn't just another Sinner. This is a broken judge from another universe who has declared war on humanity itself. Caught between redemption and retribution, hope and hatred, Charlie must find a way to save the one soul who no longer believes anyone deserves saving... before his twisted sense of justice plunges all of Hell into chaos. Because everyone gets judged... And in Hell, Sans has become the judge, jury, and executioner.

what the fuck is touhou. .that was new problem for our new disastorous being - infected sans!(aka jacob). btw infected sans - alphatale by shadikal15 there will be other arrival of alphatale in touhou universe and possibly several unieqe interaction of abilities. This is not serious crossover btw so no need to be argued with how two universe react to eachother?(Technically three since edensphere and Twilight realm is seperated wiki with alphatale).would it be a war between two old realm or coexistence of two seperated world? And for touhou it was obviously from ZUN and both alphatale and touhou project wasnt own by me(except my OC i guess)

Killer always knew he would burn in Hell. All the sins he committed. All the death that came with every step he took. Killer was out looking for something new, while Nightmare wasn't around to fix his unstable soul. He meets three little red bastards and their big bad wolf. "eh, you kill, i kill. what's the worst that could happen?"

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!!!

My other art books are full, so here's a new one! The third! I wanna share my tumblr art with you guys <3 I add 3 new chapters at a time. Not everyday updates, just whenever. ENJOY!!!

Quetzalcoatl Arc is the third daughter of Liam and Alsie Arc. She is also the mother of Jaune Arc as she raises him while the rest of the Clan but she saw the potential in him and trained him.

Y/N, 5 year old, was found in a collapsed AU that just wouldn't be erased from existence. The bad guys found them and took them in as their own. Who knew taking care of a child was so difficult

If given the chance, would you start over? After falling into a timeline where nobody was murdered, his mother never died, and his father was never erased, Sans should be ecstatic that he has a second chance with his loved ones. But there is no denying the trauma he'd been through, either. Everyone is supposed to be dead, after all. What if Frisk comes back to take it all away again?

Undertale ideas, some crossovers. may write them, but also up for adoption. please message me if you want to adopt one as I'd like to read it myself &lt;3

Alternate Future Of The World. Includes Crossovers From GT, UT & SU That Are Marked With DG![Crossover].

WARNING: THIS CONTAINS HIGHLY MATURE CONTENT (BLOOD, VIOLENCE) READ AT YOUR OWN RISK Money can change a lot of things. It can even change your destiny. Plunge yourself into a life of romance, science, disappearance and misunderstanding. ________________ "When you get better, I'd like to kiss you" ... Gaster only wanted to conduct an experiment. He surely didn't want his life to be taken over by weird feelings. He also wanted the only thing he couldn't really have. He wanted you. What will he obtain? Will his research finally be completed? Or will he have to start another one? As for you, will you be able to move on from the past? Words count: 81.390 Also contains mentions of nsfw [Rankings: #1 in #gaster (08/21/2022), #5 in #xreader (08/21/2022)]

Long ago, two races ruled over the Earth: Humans and Monsters. One day war broke out between the two races. After a long battle, the humans were victorious. They sealed the monsters underground with a magic spell. Many years later... Mt. Ebbot: year 23XX Legends say those who climb the mountain never return. Here we see our main protagonist, Izuku Midorya, being chased by his childhood bully: Katsuki Bakugou. He ends up climbing Mt. Ebbot in hopes of escaping and takes refuge in a dark cave. While wandering the cave for a hiding spot, he fails to see the giant hole... and he falls. ------------------------- Here is the rewrite of my Fallen Hero AU. I do not own BNHA or Undertale. The cover art is mine. Ownership of Undertale goes to Toby Fox Ownership of BNHA/MHA goes to Kohei Horikoshi. This is a BNHA x Undertale crossover. It's my first story so please enjoy. ⚠️ Warning⚠️ This book contains swearing. Yield, oh innocent ones. There are also mentions of abuse, discrimination, and bullying, so avoid that too if you don't like it.

［deltarune M!Kris × F!Reader］ ❝To my princess crowned in ivory, with her stainless brilliance, she dances in the snow.❞ (Y/n) (L/n), one of the few humans that reside in Hometown and Susie's childhood friend who has extreme social anxiety. Being late had led her into a wacky adventure with her best friend and the other quiet kid in class. When a person has extreme social anxiety, they struggle to communicate to others. Bear in mind, that they only struggle to form connections, it doesn't really mean that they don't want to. "It's just, I wish I could speak." ======== cross posted on AO3! (I'm only posting it here just because I want to see the word count) going with the boy meets girl trope so reader's pronouns are she/her and for kris' are he/they since i randomly switch between the two like a 50/50 guarantee on genshin, note: you'll always get the disappointing one art: https://twitter.com/choco_mugi

For countless timelines, Frisk have been trying to find a new ending. A true happy ending where all of his friends and family, even Chara and Asriel can be saved. And after an unusual reset, he might finally find it. However, not only did this changed the history of the world, but it also creates new powerful enemies that threaten to destroy everyone he know and love. Will he be able to protect his love ones ? Or will he lost them for good? Mature rating for bullying, swearing, child abuse, attempted suicide. Part 1: A New Fate-Ongoing Part 2: Darker Yet Darker- Part 3: The Black Beast-

You know...she really thought that'd be it. That after obtaining as much power as she did, she'd be left alone. No more insane adventures, no more confusing places...just her and her Underverse she protected. Waking up in a dark forest with limited power was NOT on her to-do list.