Undertalefanfic Stories

364 Stories

I Want To Forget (Killer Sans x Reader) by OreoDaSkeleton
#1
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...
Write A Note (Sans x Female!Reader) by OreoDaSkeleton
#2
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...
Completed
Undertale: giving soul by Author-Dayo
#3
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...
Sans AU x Reader(Bad Guys) by Stitch1123
#4
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
Knock Knock {A Sans X Reader - Undertale} by LittleFluffyAlpaca
#5
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
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...
I Promise (sans x reader) by harley_177
#7
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
New Purpose (US!Papyrus x Female!Reader) by OreoDaSkeleton
#8
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...
Florist Merchants Journey - Melati!sans by azfiruz
#9
Florist Merchants Journey - Melati...by FIRUZ
Slice of life and adventures with Melati!sans and his loyal companion Jasmine, together they will travel across the Multiverse as traveling Merchants. what will they fi...
Jaune 404 by RestoringAlphatale
#10
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...
Wholehearted Saga: Origins by HattyTheWriter
#11
Wholehearted Saga: Originsby HattyTheWriter
Innocence had already been more or lost by the Dreemurr brothers, but the friends and memories they'll make along the way are certainly worth it. The question is: will t...
||Mettaton x Reader || Oneshots and Scenarios|| by Never-Coming-Back
#12
||Mettaton x Reader || Oneshots an...by Never-Coming-Back
Mettaton thinks you look absolutely fabulous~! Come and read this book so he can give you some love darling~!
The King and I (Asgore X male reader) by yurikalad14
#13
The King and I (Asgore X male read...by Landon J. Smith
A second-person relationship with Asgore Dreemur, former king of the underground. With all the pressure on a sixteen-year-old hiding his sexuality from his family and th...
Forgotten Phoenix (New Purpose Sequel) by OreoDaSkeleton
#14
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...
All That Remains by TheAngstQueen14
#15
All That Remainsby TheAngstQueen14
A story of a young Ink discovering what it means to be a Protector of Creation, as he finds his place in the Multiverse.
All The Dead (Chara X Reader) by Shxnxng_Stxr
#16
All The Dead (Chara X Reader)by y
"Psychotic tendencies..." As a child, Y/n L/n had a good life. She was always complimented for her h/c hair and e/c eyes. She had a loving little sister and a...
× [Sickness] × || Undertale Fanstory || The Gasters/Skeleton Family by Nanaz_Nazmaki
#17
× [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...
Is This a Dating Sim? - Chara X Reader [Discontinued] by Akarinotion
#18
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...
Oh yes! (Mettaton X Reader) by TheGothicPrince
#19
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
By His Side [Nightmare x Reader] by LexisZoldyck
#20
By His Side [Nightmare x Reader]by Sans Fangirl :0
"Are... Are you going to come back?" I ask the black gooey skeleton. I bite my lip as I hold back my tears from falling. I grasp into the end of my gloves tigh...