Underfell Stories

1.2K Stories

Becoming papyrus from underswap  by KarmaAkabane425
#1
Becoming papyrus from underswap by Karma Akabane
What if someone became papyrus from underswap? What if they gave their brother more freedom? What if they were the one that error kidnapped instead of sans? (Things wil...
Can I take you to Dinner? Mafi-fell!Sans x Reader.  [COMPLETED] by MissHoll-E-Socks
#2
Can I take you to Dinner? Mafi-fel...by MissHoll-E-Socks
"How rude, not even gonna ask for a name??" He teased. "Why are you here?" You glowered, raising the whisk. The skeleton scoffed: "Well, glad yo...
AU Sans X Reader One-shots by Little_Blue805
#3
AU Sans X Reader One-shotsby Blue
Completely female readers unless a request asks different. That's...really about it, enjoy!
(Underfell sans x reader (female)) UNDERCOVER by moon1767
#4
(Underfell sans x reader (female))...by Arie
You're a human that has fallen into Mt. Ebott on the year where all humans dress as monsters...Halloween. So how will the monsters know if you're a human or not?
A Skeleton's Hope (Undertale AU's x Reader) DISCONTINUED/BEING REWRITTEN by Just_Vibing_Man
#5
A Skeleton's Hope (Undertale AU's...by Dead
Sans and Papyrus were your best friends until randomly they just cut off all contact with you. This went for everyone else in your life so it didn't really hurt that muc...
Becoming Error, The Forced God Of Destruction by PinkieKidoCup
#6
Becoming Error, The Forced God Of...by PinkieKido Cup
What if someone is reborn as Error? What if they aren't so bad? What if they're suffering in silence and keeping their job a secret for fear of hate? How will Ink react...
Furtastic by Juniperlives43
#7
Furtasticby Juniperlives43
A girl who has never seen the world outside of the lab sees it for the first time only to fall down into the underground. What will she find down there?
Sans AU x Reader(Bad Guys) by Stitch1123
#8
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
My Life as the Prince's Servant (UF!Asriel x Male Reader) by Ungrateful_Hacker
#9
My Life as the Prince's Servant (U...by Ungrateful_Hacker
After the monsters broke free from the underground they enslaved all of humanity. The monsters took complete control over the world and the world was powerless to stop t...
UnderTale Oneshots (FINISHED) by TheGrinningKitten
#10
UnderTale Oneshots (FINISHED)by TheGrinningKitten
(I DO NOT WRITE ABOUT UNDERTALE ANYMORE SO PLEASE DON'T REQUEST ON MY CHAPTERS) (AND FOR THE LOVE OF GOD STOP COMMENTING ABOUT MY GRAMMAR, I AM SWEDISH AND I HAD A HARD...
Completed
Black Roses (Overprotective!Bad Guy Sans' x Child!Reader) by JulesRedenger
#11
Black Roses (Overprotective!Bad Gu...by JulesRedenger
Nightmare found a young child a long time ago. When they fell into a coma it sent him over the edge. several hundred years later the child wakes up in a castle of darkne...
Completed
Becoming an error by KarmaAkabane425
#12
Becoming an errorby Karma Akabane
What if someone from our world became error and didn't destroy au's and left that for nightmare and his gang and claims au's? ( different things including personalities
Undertale x male reader by RandomKid362
#13
Undertale x male readerby Toad Yeager
So harem book of Charas and Frisks x male reader but real description is below this. The only one of his person in all universes is part of Undertale with an OP powers b...
The One Thing That They Care About (Sans AU x Reader x Papyrus AU) by voltimer
#14
The One Thing That They Care About...by 𝐜𝐡𝐫𝐨𝐧𝐨𝐬, 𝐭. 𝐯.
Y/n L/n. A special human with a special SOUL. Yes, her Soul Trait is something new. But other than her SOUL trait she has another secret. One day, while she was at the...
Frans pictures by Ruby_Cat1082006
#15
Frans picturesby Zhira
I found this pictures on deviantart,pinterest,google and Frans Amino
An Oath of Mercy || UnderFell Sans x Reader by StrawberryMilkSnake
#16
An Oath of Mercy || UnderFell Sans...by Silver
One clumsy moment and a broken leg are all it takes to leave you at the mercy of the very edgy and very hostile monsters of the underground. Thanks to your knowledge as...
Completed
Light or dark? Bad sanses x child reader by Raining-3lsewhere
#17
Light or dark? Bad sanses x child...by Leah ☔︎︎
Y/n was and/or is a very sweet child, unfortunately for them they weren't treated very well by their mother or father, Y/n was abused and didn't have anyone. Fortunately...
Completed
Our Pen by R3myR3ad3r
#18
Our Penby R3myR3ad3r
You're the Ink of your multiverse, and you don't even know it. Well, until you meet the Ink of another, along with Error. -NOTES- I made the cover! This obviously isn't...
Completed
I am the classic by KarmaAkabane425
#19
I am the classicby Karma Akabane
Somehow...I've become a sans...and not just any sans.. I'm classic!? What the flip is going on!? Wait why are different sans and papyrus's showing up at my home? I didn'...
Undertale: giving soul by Author-Dayo
#20
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...