Undertalefanfic Stories

362 Stories

Undertale: giving soul by Author-Dayo
#1
Undertale: giving soulby Author-Dayo
This is a story before the last human fell around the time Chara was still alive and well. Humans were not being hunted till the adopted prince's passing, however with a...
I Want To Forget (Killer Sans x Reader) by OreoDaSkeleton
#2
I Want To Forget (Killer Sans x Re...by ~Oreo~
Want to talk about falling into the wrong place at the wrong time? Y/N definitely scored big time on that one. One moment she's falling, the next she finds herself trapp...
Completed
Write A Note (Sans x Female!Reader) by OreoDaSkeleton
#3
Write A Note (Sans x Female!Reader)by ~Oreo~
It's only been a few years since monsters have been released from their underground prison. In some towns, monsters are welcomed with open arms. Others? Not so much. Y/N...
The Soulmate AU by SillyOddNugget
#4
The Soulmate AUby Mika
Undertale aus x reader Featuring (in order): Nightmare Error Dream Ink Cross Dust Killer Blue Horror The Soulmate Au is where everyone that comes or lives there will hav...
New Purpose (US!Papyrus x Female!Reader) by OreoDaSkeleton
#5
New Purpose (US!Papyrus x Female!R...by ~Oreo~
Y/N, meets a new coworker that changes her life forever. A monster, doing his best to make a living after moving out of the underground. Sans is this ecstatic, cheerful...
Wholehearted Half-Souls by HattyTheWriter
#6
Wholehearted Half-Soulsby HattyTheWriter
After the barrier had been broken and harmony between monsters and humans had returned, a new sinister force arises after peace returned to the land. When the darkness t...
Sans AU x Reader(Bad Guys) by Stitch1123
#7
Sans AU x Reader(Bad Guys)by Dematoid
Au Sanses x Reader If you like edgy and scary Sanses, and romantic and fluffy and edgy scenarios, then this is the book for you!!
Completed
"Not Quite Determined" Sans x Human/Monster Reader [COMPLETED] by FloweyTheGrouch
#8
"Not Quite Determined" Sans x Huma...by AsrielAs Flowey
You've lived your life without ever knowing your parents. Despite that you dream big because you don't have much; aiming to become a famous singer and prove anyone who h...
Forgotten Phoenix (New Purpose Sequel) by OreoDaSkeleton
#9
Forgotten Phoenix (New Purpose Seq...by ~Oreo~
It's been a few years since Y/N started her family. Without Honey, she made due with what she had; that being the cafe, her brother-in-law Blue, and her two twin sons. O...
||Mettaton x Reader || Oneshots and Scenarios|| by Eli_The_Person
#10
||Mettaton x Reader || Oneshots an...by Eli_The_Person
Mettaton thinks you look absolutely fabulous~! Come and read this book so he can give you some love darling~!
I Promise (sans x reader) by harley_177
#11
I Promise (sans x reader)by <3
Y/N was a normal teenager who gets bullied everyday, she has only one friend who called 'Frisk' one day they decide to climb the mountain but then... "I want you to...
Completed
Jaune 404 by RestoringAlphatale
#12
Jaune 404by Brothers Forever
When cardin revealed jaune's transcripts to everyone in beacon he was bullied everyday except Team RWBY, Team NPR, Team CFVY, The arc sisters, Saphron's family, Ozpin, G...
Oh yes! (Mettaton X Reader) by TheGothicPrince
#13
Oh yes! (Mettaton X Reader)by TheGothicPrince
This is the first fanfic I've ever written so plz don't judge. Reader-Chan is a female BTW but guys can read too. I hope u enjoy it! ^-^ COVER IS NOT MINE
The Broken Game // An Errink story~~~ (Multiship) (Has Alot Of Krème Too-) by sanscestlover20075
#14
The Broken Game // An Errink story...by sanscestlover20075
Oki so my story will suck just gotta tell 'cha so the story is about... Error and ink were childhood friends because you know they only knew eachother in the anti void...
Completed
Is This a Dating Sim? - Chara X Reader [Discontinued] by Akarinotion
#15
Is This a Dating Sim? - Chara X Re...by A k a r i
(Y/n)(L/n). A girl who received an unknown email telling her to download the link of a "game". She didn't know what could happen.. Except maybe a broken laptop...
Knock Knock {A Sans X Reader - Undertale} by LittleFluffyAlpaca
#16
Knock Knock {A Sans X Reader - Und...by Cuddles the Alpaca
You were always a curious child. One day, your curiosity took you too far. You lived not to far from a mountain, MT. Ebott, and always wanted to see what was on the top...
Completed
A Fatal Schnee Has Occured (On Hold) by RestoringAlphatale
#17
A Fatal Schnee Has Occured (On Hol...by Brothers Forever
When Weiss Schnee Gets Hit by Cinder Falls Fall Maiden power she falls into the abyys and ends up in the anti void instead of The Ever After where she meets Error!San's...
× [Sickness] × || Undertale Fanstory || The Gasters/Skeleton Family by Nanaz_Nazmaki
#18
× [Sickness] × || Undertale Fansto...by Nazma Grace Lambert
One day, Sans fell sick. His sickness came out of nowhere and it cannot be cured no matter how many medicines Gaster gave him. Because of the sickness, Sans stayed still...
Undertale Zodiacs (its goin down) by glittrzzz
#19
Undertale Zodiacs (its goin down)by glittrzzz
UNDERTALE ZODIACS WOOOOHOOOOOOO This is definitely gonna turn out gr8 {Highest; 200 in Random}
Gamble ~Underfell Sans x Reader by atomiquee
#20
Gamble ~Underfell Sans x Readerby K
not every story has a happy ending