Undertale Stories

1.2K Stories

Can I Stay? (Underswap!Sans × Reader) by Fruityyloopz
#1
Can I Stay? (Underswap!Sans × Read...by Justmonika
[Prolong] My name is (Y/N). I have experienced many resets, so many I have lost count. The only people who remember are Sans, Flowey, and me. The monsters down here are...
reborn as killer sans but different by nap_TimeSensei
#2
reborn as killer sans but differentby 🌸💖🌸
like something really really different. a young adult boy got killed by got pushed of s building but he seems didn't remember anything, but he woke up in a copy au of k...
Fresh New Antivirus by Hidden-Ajinn
#3
Fresh New Antivirusby Hidden Ajinn
Fresh is Admin of the Multiverse!? This can't end well ... or can it? This is an alternate universe - er, multiverse - where Fresh is responsible for the monitoring and...
Reborn as Error by Kiwi_Seal
#4
Reborn as Errorby Kiwi_Seal
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 despit...
Friends Meeting Enemies by AngelGold238
#5
Friends Meeting Enemiesby Angel Gold
What if there was a multiverse where Error and Ink were friends? What if the voices were the creators? What if they went to the Fgod multiverse because the voices were b...
i n t o y o u 『 AU sans x badass!reader 』 by kyothedinonerd
#6
i n t o y o u 『 AU sans x badass!r...by kyo
! Art is by aozukikawasemi on Twitter ! The bunch of skeletons were taken aback once they took in the unexpected appearance of who exactly? You, of course. You were mind...
Save Me (Sans x Bitty Reader) by AshleyEevee
#7
Save Me (Sans x Bitty Reader)by QueenEevee
Since there's not enough x bitty reader stories out there. You are a stray bitty who ran away from your last abusive owner. Rankings on (6/18/2022) # 1 sans out of 28...
Sanscest Oneshots by LeFriendlyBoi
#8
Sanscest Oneshotsby Your Parental Unit
Title says it all, just... Shitty Undertale Oneshots.
UnderHappened by FatalityWanes
#9
UnderHappenedby FatalityWanes
The Undertale Genocide Route is happening, but a new card has joined the deck: Finn, a quiet kid with a love for stuffed animals who falls into the Underground soon afte...
Completed
reincarnated as undertale papyrus by Lazy_Gowrl
#10
reincarnated as undertale papyrusby lazy girl
(COVER ART NOT MADE BY ME, IT IS CREATED BY UndertaleFan92 IN PINTEREST) Inspired by @KarmaAkabane425 they got some good stories. What happened when someone from our...
Ashes to ashes Dust to Dust by Loserhighway
#11
Ashes to ashes Dust to Dustby Hello there
I want to make a story about Dust tale sans. however I want to give him a whole new personality, background and even powers. somethings will stay the same. but if your i...
ClockTale an Undertale AU by fublle
#12
ClockTale an Undertale AUby Timer
"Hm?" Timer asks taking his wrist watch off, checking the time before taking out a screwdriver and pulling it apart. Nervous habit of his. The meeting between...
Becoming ink sans from undertale multiverse!? by KarmaAkabane425
#13
Becoming ink sans from undertale m...by Karma Akabane
What if someone from our world died knowing a lot from the undertale and their multiverse/underverse? What if that person also knew about the balance and didn't creat to...
You and Your Bitty Pals by Blueprint15778
#14
You and Your Bitty Palsby Blueprint15778
It has been 5 years since monster broke free from the barrier, since then monsters, and humans live together in peace. But for some reason monsters have some how go a mi...
Fallen Angel (Gaster x reader) by Feniksiara
#15
Fallen Angel (Gaster x reader)by Big Simp
DISCLAIMER: The god figure created in this fanfic is purely fictional. He is purposefully made to be prideful and cruel and is not supposed to represent any god. I am re...
A light in the darkness |Nightmare x reader| by NekkoetOnTheIntrnet
#16
A light in the darkness |Nightmare...by NekkoetOnTheIntrnet
Everyone craves the light. It's what keeps them going. people will do anything they can to keep their light shining, but what will they do if the light extinguish and wh...
C0deta1e an Undertale AU by EquanoxDragon
#17
C0deta1e an Undertale AUby Equanox
This is the story of C0de Sans, and how he came to be. WARNING It is very possible that this story may take some dark turns in the future, and there will be use of stro...
A Trio of Misfits | Bittybones story by Sabinarius
#18
A Trio of Misfits | Bittybones sto...by Sabinarius
Bitty! US pap x reader x Bitty! US sans Our two little bitties have been through a lot, so what happens when they meet a human that's hurting just as much as they are...
Undertale meets Shield by Jaybird_Dragon2021
#19
Undertale meets Shieldby }Dunked_on_24/7{
After the barrier on the Underground, the monsters come out but to only be feared by humans. They decide that they will live on MT EBOT, away from the humans so that the...
AU sans x Ghoul! Reader {I'm more than a human} by Ms_Otaku_Girl
#20
AU sans x Ghoul! Reader {I'm more...by !!POTATO GIRL!!
♡>>>Lovely cover by: @Hisayashi<<<♡ ghouls has been spotted among the city, all citizen has they're guard up. The Government are trying to find a way t...