Undertaleau Stories

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1.2K Stories

  • Acceptance || Undertale x M.Reader  by CrystalCelestia
    CrystalCelestia
    • WpView
      Reads 43
    • WpPart
      Parts 3
    I don't usually see FanFiction with Male readers or Y/n so I'm making one of my own just for the fun of it. This is an Undertale x M.Reader FanFiction. I'm not really sure where I'm going with this story. It's a story about y/n with a grey-coloured soul; it doesn't really mean anything other than his soul is so much different from humans and not exactly like a monster as well. Originally, he also did not belong in this world. I guess I'm just writing what comes to my mind? English is also not my first language so please bear with me. And I have never written a FanFiction story before, I've been a fan of undertale for so long but I quit and now I'm back here again. The cover also does not belong to me, and the future covers I will also be using. They all belong either to Pinterest or just Google.
  • Fell Sans X Shy Reader by LethalAngel98
    LethalAngel98
    • WpView
      Reads 1,524
    • WpPart
      Parts 6
    Monsters are released from the underground. Thanks to that your life has become worse than ever. Now not only are you bullied and picked on by humans, but now monsters! Things can't get worse right? Wrong! A skeleton monster that goes by Sans especially likes to pick on you. He makes every day in your college class a living hell. He just won't leave you alone. He's the worse there is. Or at least you thought. But after your father gave you a beating and you run away, he offers you a place to stay. No questions asked. Just who is this monster really? Is he really so evil? Or is he just trying to hide something? (DISCLAIMER! COVER NOT MY ART!)
  • Unexplored dream of otherworldly ghost [Touhou X Alphatale] by KhaizanFaathir
    KhaizanFaathir
    • WpView
      Reads 294
    • WpPart
      Parts 7
    what the fuck is touhou. .that was new problem for our new disastorous being - infected sans!(aka jacob). Infected is a mysterios entity came from the destroyed AU named alphatale, with many unexpected occurence, this monster had stumble upon gensokyo!, will touhou able to compromised this madman of undertale AU?, tried find out in the story! 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 and alphatale it was obviously from ZUN and shadikal respectivel, and both alphatale and touhou project wasnt own by me(except my OC i guess)
  • Au sans Rp book (Mainly Bad Sanses)(No.2) by FictionalShippinBean
    FictionalShippinBean
    • WpView
      Reads 25,124
    • WpPart
      Parts 158
    (Check Rp rules in the first book before you rp in this book :3) Most of these are in real life and have me in it and will sometime have my OC, Cide and her AU's aswell as my other OC's in it(Including my OCs from different fandoms)
  • inverse!tale by CrystalCrystal739
    CrystalCrystal739
    • WpView
      Reads 4
    • WpPart
      Parts 2
    "What has been done cannot be reversed." This book contains Mentions of SA, Bullying, Assault, harassment, Images with gore etc so please do view with caution
  • Percy Jackson son of Omnipotent!Sans by Xs38822
    Xs38822
    • WpView
      Reads 94
    • WpPart
      Parts 1
    Omnipresent Sans, travels to a new AU where he finds a small child, what will happen to the small child when he becomes his son.
  • The Outcasts I - The Beginning by Psych0t1c_Bread
    Psych0t1c_Bread
    • WpView
      Reads 436
    • WpPart
      Parts 76
    A small gang from New York, known as the Outcasts, maintains rule over the streets of Brooklyn, creating trouble and having fun like the children they are. However, when a stranger appears in their home seeking refuge, what will they do? Meanwhile, Delta, one of the AU guardians, stumbles upon a strange crack in the ground. But what happens when the mysterious crack begins sucking everything in like a black hole? And what happens when Delta gets sucked in? (Nothing except for the plot, who I kind of made Delta to be, and the Outcasts as a group belong to me - credit to the actual creators of any Sanses I use here. The Outcast gang itself is highly inspired by Newsies and The Outsiders.)
  • The End by Daz890
    Daz890
    • WpView
      Reads 11
    • WpPart
      Parts 1
    an Undertale AU By Daz890/me This story started back in 2022 and finished production in 20
  • [°Undertale AU's x Reader°] |•one shots•|slow updates!] by Myste-Rey
    Myste-Rey
    • WpView
      Reads 7,917
    • WpPart
      Parts 42
    The sanses glared at the new entity at their world in fear but overtime their fears have lessened and started to adopt the new entity as their own. Afraid, of the faith might brought on to them they just braced for the best. This fanfic is made around 2022-23 so don't expect good things especially at the first few chapters of this book! (Also my English isn't my first language so bare with me! Thank you!) <[Requests are always open! I suggest you request at introduction page to avoid confusion!]> !!most definitely the cover isn't mine!! !!Non of the arts,video,AU are mine unless I told you it was mine!! !!credits to the au creators, and Toby fox for creating Undertale!! -Myste-Rey/author (Now Rein!) [!! the story will be updating slowly (very slowly) !!]
  • What if ink joined the bad sanses? Book 3 by nobody-nerdz
    nobody-nerdz
    • WpView
      Reads 132
    • WpPart
      Parts 12
    Ink has spent centuries protecting the multiverse, creating worlds and saving lives. But when Dream, the once-kindhearted leader of the Star Sanses, begins to fall into obsession and control, Ink finds himself pushed aside and treated more like a weapon than a friend. With nowhere else to go, Ink turns to the last place anyone would expect - the home of Nightmare and the Bad Sanses. Among the very people he was taught to fear, Ink discovers something he thought he lost forever: a family. But old wounds don't heal easily, and with the multiverse hanging in the balance, Ink must face his past, his fears, and the question that has haunted him for centuries... Where does a guardian go when there is nothing left to protect? This is the last book :( of three
  • Happy N' Bombs by JinxieShy
    JinxieShy
    • WpView
      Reads 161
    • WpPart
      Parts 10
    One is a redeemed villain with a lifetime of solitude and no friends. One is a Happy-Go-Lucky skeleton with too many friends counting on them. Can they survive as each other?
  • Between the stars | OuterTale AU by FloweyTheDemonFlower
    FloweyTheDemonFlower
    • WpView
      Reads 305
    • WpPart
      Parts 9
    Howdy, my friends. The whole story will be from the perspective of Sans as the reader, but there might be some P.O.V. changes. Enjoy the story =] A long time ago a war broke out between humans and monsters. After years of fighting, humans won and banished the monster into outer space, to a small galaxy surrounded by a bubble. Years after the war, the royal scientist and philosopher, Professor W. D. Gaster, created an experiment. The experiment seemed successful and he named it... Sans. Undertale is owned by Toby Fox, NOT ME!! I didn't come up with OuterTale either, this is just my take on it. None of the art is mine unless I specify.
  • Fallen to freedom by absolutelYin-Sane
    absolutelYin-Sane
    • WpView
      Reads 17,412
    • WpPart
      Parts 6
    Error had enough, he finally snapped. After years of abuse from Ink and his friends, he snapped. He took a knife, and set himself free. Forever. But Destiny was so upset over her chosen child, she decided to give him a second chance at life.
  • Underfrost by plush-blast
    plush-blast
    • WpView
      Reads 23
    • WpPart
      Parts 2
    (yes i renamed it because i saw a au which had the name. and no i didn't do the same with the title image as i'm a low quality creator) a au which was at the begining a sort of mess of ideas and mutliple ideas of au and a humongus rip off of underswap (the fanon as i didn't know that ts!underswap) which was so near to his canon version i decided to change it all and time by time, fusion of ideas which given me other ideas it became totally different. i might not continue it (atleast not now, not that anyone seem to be captivated by this ^^,) plus i made posts on reddit and tumblr to ask something, but as mostly nobody awnser for now i don't know what way i should take (i have two ideas, more or less chaotic).
  • Living with Gaster Gang by SirenaRen
    SirenaRen
    • WpView
      Reads 32
    • WpPart
      Parts 2
    Beyond every universe and adventures, there's always the VOID with viruses and dangerous creatures. That's where five same person in different alternate universe met in their unfortunate fate with the home they accidentally summoned, trying to survive on every danger that was created and everything they could to escape for their homes. Wingding and Stars, the two scientists try their best to keep the team company and make sure they didn't get anything that could be harm throughout the void. Swap, being the housekeeper, make sure they're filled with meals and house clean. Fell being the protector of the gang and keep the monsters that was combined in worst way possible away and B, despite being blind, he sometimes keep them company and help everyone he can. Despite them being the same person in different personalities and universe, they always keep together as a team. But what happened if Fell brings someone that was injured... But it's not another version of themselves but a wounded human girl that somehow had powers and wings that came out of nowhere with a portal that never closed? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Reboot and LORE accurate (as I can) of Living with Gaster Gang series. This is season 1 of Sirena's Wild adventure Gaster Gang and Swapfell belongs to Bunnymuse Maestro belongs to Flotts Sirena belongs to me.
  • Nexusverse: Alphatale by SNAS40
    SNAS40
    • WpView
      Reads 909
    • WpPart
      Parts 9
    After The EVENT, The Multiverse and everything else were back in balance, and things were going well. Until, a new entity appears in the anti-void, out of thin air supposedly, will this be..a new beginning?.. Am pretty new in writing, but i still try my best to do a pretty good story. Still learning tho! Credits Undertale - Toby Fox Outertale - 2mil127 Alphatale - SHADIKAL15 Underverse - Jael Error Sans - Crayonqueen Ink Sans - Myebi Dream and Nightmare - Joku Cross - Jael Core Frisk - Dokudoki Color Sans - Superyoumna Epic Sans - Yugogeer Murder Sans - Ask-Dusttale Horror Sans - Sour Apple Studios Killer Sans - Rahafwabas Insanity Sans - UTF Art for the cover - Dishwasher Chara Art used in the chapter - N4ZO WARNING This story contains swearing, violence, and blood
  • Taking cover by Battle_Penguin54
    Battle_Penguin54
    • WpView
      Reads 172,414
    • WpPart
      Parts 13
    Frisk has spent her entire life surviving by stealing from the wrong people. After a failed heist lands her in the hands of the Black Roses, the city's ruthless human crime syndicate, she is offered one impossible choice: infiltrate their greatest rivals, the Monster Syndicate, or die. Armed with nothing but a fabricated story and orders to destroy the Family from within, Frisk earns the trust of monsters she was taught to fear. But the deeper she sinks into their world, the harder it becomes to believe the lies she's been told. As loyalties blur and dangerous friendships form, Frisk finds herself caught between two criminal empires on the brink of war. When her betrayal is exposed, both sides force her to make a choice that could cost her everything. In a city ruled by blood, trust, and family, survival may no longer be enough.
  • Underoffice (a sans au office documentary series) by nobody-nerdz
    nobody-nerdz
    • WpView
      Reads 37
    • WpPart
      Parts 4
    Moving back home after a breakup wasn't exactly part of Ink's life plan. Neither was living with his mom again, being unemployed, or letting his old high-school best friend Blue convince him to interview for the newly vacant Head of Design position at Dream and Nightmare's family company. Somehow, he gets the job. Now Ink has to survive eccentric coworkers, two bickering brothers running a company together, a documentary crew that refuses to stop zooming in on him, and a digital design system he barely understands. Worst of all, learning that system means working very closely with Error-the company's antisocial, sarcastic Head of IT who seems determined to make Ink's new job as difficult as possible. Ink came home expecting to start over. He just didn't expect his new life to involve this many skeletons. One office. Over Thirteen skeletons. Zero clue what they're doing.
  • My Doodles :V by MAD011124
    MAD011124
    • WpView
      Reads 15,099
    • WpPart
      Parts 29
    just a dump of artz I made Mainly with undertale related things :v aka undertale aus
  • The End Of Our World by VenusOfAlgebitty
    VenusOfAlgebitty
    • WpView
      Reads 5
    • WpPart
      Parts 2
    "A biologist. A physicist. A presence." A sudden issue appears in the Undertale Multiverse: Codes are turning fragile. Entire timelines shatter due to their own structures rotting, besides the side effects that make survivors of those collapsed timelines a prisoner of their own minds, slowly deceasing them. It takes a group of the most intelligent remaining characters to save the multiverse. As they try to unite and cure the timelines' codes... Secrets get revealed. The truth turns undeniable. The good gets rewarded, and the bad -... (This fanfiction is unaffiliated with any of the AU's creators on the story! For more information, read "The Chapter Zero- What you need to know" !)