Undertalefanfic Stories

365 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...
Sans AU x Reader(Bad Guys) by Stitch1123
#3
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
New Purpose (US!Papyrus x Female!Reader) by OreoDaSkeleton
#4
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...
||Mettaton x Reader || Oneshots and Scenarios|| by Never-Coming-Back
#5
||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~!
Completed
Each Has A Secret (Chara X Reader) by harley_177
#6
Each Has A Secret (Chara X Reader)by <3
The perfect Mx. Y/N always had a crush on that mysterious quite loser, Chara, but for them? They didn'r care about Y/N, they disliked them ... But what if one day, we fi...
Knock Knock {A Sans X Reader - Undertale} by LittleFluffyAlpaca
#7
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 New Falling by AlphaAndOmegaWolves
#8
A New Fallingby AlphaAndOmegaWolves
A Goat!FriskXAsriel Fanfiction After the Barrier is destroyed by Asriel, he is doomed to turn back into Flowey once more. Lilac (Frisk) desires otherwise, and gives the...
Completed
× [Sickness] × || Undertale Fanstory || The Gasters/Skeleton Family by Nanaz_Nazmaki
#9
× [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
Goodnight, Kiddo... (Adopted by Sans! Reader Fanfic) by TheShortSensei
#10
Goodnight, Kiddo... (Adopted by Sa...by Bass Drum Queen
You are an orphan, abandoned by your parents at birth. You've lived between countless foster families and a dreaded girl's home for as long as you can remember, because...
Completed
Forgotten Phoenix (New Purpose Sequel) by OreoDaSkeleton
#11
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...
I Promised (sans x reader) by harley_177
#12
I Promised (sans x reader)by <3
"but I promised that I will fix everything didn't I?"
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
I Promise (sans x reader) by harley_177
#14
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...
Love in our own way [Error x Ink & Multiship] by lets_hyperfixate
#15
Love in our own way [Error x Ink...by max
Nightmares gang were at his mansion chilling out when they hear three loud bangs at the door, they opened the door to find the star sans', lead by Ink, in floods of tear...
Gamble ~Underfell Sans x Reader by atomiquee
#16
Gamble ~Underfell Sans x Readerby K
not every story has a happy ending
Is This a Dating Sim? - Chara X Reader [Discontinued] by Akarinotion
#17
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...
The Soulmate AU by SillyOddNugget
#18
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...
Jaune 404 by RestoringAlphatale
#19
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...
All That Remains by TheAngstQueen14
#20
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.