Undertalefanfic Stories

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357 Stories

  • if i was in undertale by Needling
    Needling
    • WpView
      Reads 18
    • WpPart
      Parts 1
    a joke fic about what would (probably not) happen if i replaced frisk from the hit indie game undertale by toby fox
  • You can SAVE them... (A Sans X Reader Fanfiction) by JeannieSmolBeannie
    JeannieSmolBeannie
    • WpView
      Reads 1,361
    • WpPart
      Parts 24
    Revised and re-uploaded!! (Got rid of all those author's notes heheh) You're pretty much just minding your own business when you're suddenly pulled into the world of Undertale! A connection to a world you're fond of that you can't seem to remember... Why did you leave? Why can't you remember anything? And why does your soul look so... scarred? Questions may plague you, but hey! At least you have your not-so-fictional crush around to distract you and make you laugh till your face hurts! As for all your questions? Read on, and hopefully you'll find your answers! Sorry, no lemons or smut. (P.S: Reader may be a little depressed, and may also have gone through some trauma, not gonna lie. If you don't like graphic scenes, do not read!!! Certain characters can be a bit...murdery. Trigger Warning: Graphic Depictions of Violence, Blood, Body Horror (i think). Any other Triggers that are not mentioned here will be in BOLD at the start of the chapter and will NOT affect the story, they will be labelled/marked so you will be able to skip over them! CREDIT FOR THE COVER IMAGE GOES TO STARBEAM!!! If you like the cover, definitely check out Starbeam on Youtube, their Sans meme videos are FANTASTIC!!!
  • GothicTale: Characters & Info by gracedragon1
    gracedragon1
    • WpView
      Reads 11
    • WpPart
      Parts 1
    GothicTale is one of the newest A.U.s in the Undertale Multi-Verse. It is an A.U. created by me, Aserilla. This "World" isn't exactly the typical A.U.! It's series of Pocket Dimensions, Abandoned Universes, Unfinished/Half-Complete Universes, & the "In Progress" A.U. GothicTale. The occupants of this "World" are anything, BUT ordinary ... they are Alternates from at least 350+ Universes & more come every day! And more over, there are even Creatures from OTHER MULTI-VERSES! Read about the inhabitants to find out more.
  • Ask Error!Sans (my take).......? by H1-th3re
    H1-th3re
    • WpView
      Reads 15
    • WpPart
      Parts 1
    Hello! This is my first fanfic, so please refrain yourselves from "this writing is bad" or more. This book stars our dear Error!Sans on one of his daily basises, but why not cause chaos upon him? Yet despite his thinking, there's someone, no SOME PEOPLE lurking his void..... Not again...... Ask him, dare him, as long as it's all in good fun! Just don't be rude (Error wouldn't like that). May have some angst, so please take this description as a reminder. 14.09.2025/09.14.2025
  • The multiverse (Book 1) by KrystalKitty_Wolf
    KrystalKitty_Wolf
    • WpView
      Reads 162
    • WpPart
      Parts 22
    This book is the aphmau x undertale crossover book. Aphmau and her friends travel to Mount Ebott and fall down finding themselves in Snowdin, while there they get introduced to different aus thanks to Kitty and Sans but what happens when someone within the aus is looking to steal their souls for his own selfish purposes?
  • Fallen Girl - Undertale Fanfic by darkkris2020
    darkkris2020
    • WpView
      Reads 52
    • WpPart
      Parts 11
    Maria is the 8th fallen human, followed by the 6 other souls and Melanie. Maria must fulfil the prophecy by completing the tasks to save the underground and restore peace and harmony between humans and monsters. Will Maria survive? Will the monsters see the light of Earth again?
  • Fallen Down- An Undertale Fanfic by frisk1
    frisk1
    • WpView
      Reads 40
    • WpPart
      Parts 1
    Frisk, a young human child, climbs Mt. Ebbott, in order to prove a local legend false. But, with one wrong step, Frisk is sent tumbling down into the hidden world of monsters down below the mountain. I hope you all enjoy my story :) I DO NOT OWN UNDERTALE OR ANY OF IT'S CHARACTERS. THEY ALL BELONG TO TOBY FOX
  • Undertale GENOCIDE ROUTE by _Chowwow
    _Chowwow
    • WpView
      Reads 129
    • WpPart
      Parts 2
    blah blah ill do it later please stay 2 read though. :DDD This is my lil cousin so, Its not mine. mkayyy
  • Fallen Devil - An Undertale Fanfiction by augusttheartist2
    augusttheartist2
    • WpView
      Reads 1
    • WpPart
      Parts 1
    Lumi used to be a devil. She used to be Ạ̸̏k̵̩̉ú̸͜j̶̪͒i̴͉̐. She hated the devil ways and attempted to fly up to heaven, only to fall when she didn't know there was a barrier preventing devils to get through. She fell unconscious after landing in a cave-like area, but her fall was cushioned by soft yellow flowers. When she woke up, her wings were... angelic.
  • Sans by Ink-sanz
    Ink-sanz
    • WpView
      Reads 50
    • WpPart
      Parts 2
    'Don't forget'
  • The Howling {Sequel to Ripped Away} by Sno_The_Owl
    Sno_The_Owl
    • WpView
      Reads 12,572
    • WpPart
      Parts 12
    Encre and Fallacy have exactly what they want. Peace, and a good life set ahead. But, a faint howl, and echo seems to remind them of something...
  • Stupid SOUL Shenanigans (An Undertale Book) by HokulaniWrites
    HokulaniWrites
    • WpView
      Reads 41
    • WpPart
      Parts 2
    This is just a huge dumb book full of dumb shipping and non shipping things between the Undertale fangame human SOULs, being Jeff (UTO), Clover (UTY), Cody (UTG), Emily (UTPa.), Yara (UTB), and Batty (UTP).
  • Sans' story. =1st story= (UT FANFIC) by Yugiogianta
    Yugiogianta
    • WpView
      Reads 10
    • WpPart
      Parts 1
    ••Sans Definition: Humorous Defenition: Finished•• "Interesting." --------------------- Hey kiddo
  • Your Friendly Neighborhood Skeleton- A Sans x Reader Fanfiction by EmotionlessAnon
    EmotionlessAnon
    • WpView
      Reads 350
    • WpPart
      Parts 5
    When Frisk fell from the surface... Things have been going awful. The monsters were dying one by one by their knife. Slaughtered everywhere. And the human was almost there to meet the king. ASGORE. But when you fell down, you had the ability to restore them. But only one monster knew about your power. And his name was Sans. Will you and Sans be able to restore all the monsters in time before Frisk kills everyone in the underground?.
  • Winxtale ♡ Winx Club × Undertale by theMagical1sa
    theMagical1sa
    • WpView
      Reads 2,827
    • WpPart
      Parts 19
    After the events of the Seventh Season, the Winx Club are sent to Mount Ebott on a mission to release monsters from a cursed barrier done by wizards and mages of different soul virtues. Now with Roxy as their seventh soul, the Winx must go through various obstacles and battles to be able to break the barrier and set the monsters free. Unbeknownst to them in this journey, however, is a dark truth that lies ahead with an ally they await beyond the barrier, accompanied by the young fairy Isabela. Will they succeed in freeing the monsters from the underground curse, or will they be trapped forever in the walls placed by a twisted villain? Written by Isa Capi | theMagical1sa Characters by Iginio Straffi, Toby Fox & Isa Capi Original Plot by Toby Fox
  • The blood dripping from my hands {Undertale Fanfiction} by Colossal_Sinner
    Colossal_Sinner
    • WpView
      Reads 143
    • WpPart
      Parts 6
    "Frisk.. Just.. Please... Just stop hurting everyone!" ... "I Can't.. I can't... I just wanna go home.. It's scary down here... I'm so sorry.." "They want to go home too.. So please..." ... "Who's.. 'They'?" .. "Their name is Chara."
  • Ask: Askel and Mazoku by LeroyOmalette
    LeroyOmalette
    • WpView
      Reads 28
    • WpPart
      Parts 1
    I had originally posted this to an ask blog but I also decided to try on here. https://ask-askel-and-mazoku.tumblr.com/post/636736784131391488/welcome-to-this-that-i-wanted-to-try-but-here-are
  • A Multiverse Story by KitsuneWrites1780
    KitsuneWrites1780
    • WpView
      Reads 41
    • WpPart
      Parts 1
    Light had always thought she was only a monster/human Hybrid NOT an ancient Race, lost to a war that had broke out eons ago. But when her older adoptive disappears, she goes out into the multiverse in search of him since she always knew about the vast Multiverse she lives in. She Befriends a bunch of people like Nightmare, Dust, Wild, Abyss, Kin, Beats, V!, Swap, and even Cross. But then the X-Event started and Ink betrays her trust by siding with X!Gaster, after helping Dream save Cross, she realizes that there is something far worst happening to her home. A man by the name of Aster Opscurum appears in the multiverse with his forces to concur it, but the only person that is in his way is Light herself so he sends his forces to Kill her. Will she be able to survive these attacks? What is she Really? Is she going to be able to keep her friends, her home, away from danger, and Save the multiverse?