Undertalefanfic Stories

356 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...
The Soulmate AU by -Horror_Sans-
#3
The Soulmate AUby Horror
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...
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!!
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...
"Not Quite Determined" Sans x Human/Monster Reader [COMPLETED] by FloweyTheGrouch
#6
"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...
||Mettaton x Reader || Oneshots and Scenarios|| by Eli_The_Person
#7
||Mettaton x Reader || Oneshots an...by NOBODYBUTMEANDYOU
Mettaton thinks you look absolutely fabulous~! Come and read this book so he can give you some love darling~!
All The Dead (Chara X Reader) by Shxnxng_Stxr
#8
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...
The King and I (Asgore X male reader) by yurikalad14
#9
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...
I Promise (sans x reader) by harley_177
#10
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
Random Undertale Multiverse RP by MoonSoul_26
#11
Random Undertale Multiverse RPby 💎FoxGirl💎
Welcome to my book of UTMV. Here have some cookies before you start. 🍪🍪🍪
Gamble ~Underfell Sans x Reader by atomiquee
#12
Gamble ~Underfell Sans x Readerby K
not every story has a happy ending
Sweetheart...I love you (flowerfell sans X frisk) by Derpy13
#13
Sweetheart...I love you (flowerfel...by Shakira Meza
(Completed) *my first fanfic I made* Based on a beautiful story called, "overgrowth" if you haven't read it I recommend you to please read it...it's really em...
Completed
Jaune 404 by RestoringAlphatale
#14
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...
Florist Merchants Journey - Melati!sans by azfiruz
#15
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...
× [Sickness] × || Undertale Fanstory || The Gasters/Skeleton Family by Nanaz_Nazmaki
#16
× [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...
Completed
Undertale: giving soul by Author-Dayo
#17
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...
Knock Knock {A Sans X Reader - Undertale} by LittleFluffyAlpaca
#18
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
I Promised (sans x reader) by harley_177
#19
I Promised (sans x reader)by <3
"but I promised that I will fix everything didn't I?"
A Fatal Schnee Has Occured (On Hold) by RestoringAlphatale
#20
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...