Undyne Stories

1.2K Stories

Undertale a New Monster is Here by Why_Is_It_Spicy
#1
Undertale a New Monster is Hereby Why_Is_It_Spicy
Y/N was just your normal every day monster in the underground, well. That's what he thought at least before meeting the human. Join Y/N in his adventure with the human i...
The Alien Hero of the Underground (Ben 10 X Undertale) by Logan2465
#2
The Alien Hero of the Underground...by ShortMannZ
This story follows the storyline of if Ben 10 travelled the Underground with Frisk. Feel free to notify me of any errors in the story. I hope you enjoy. (I do not take c...
Undertale:Secrets by ItIsComic
#3
Undertale:Secretsby Comic
Sans has had an interesting past. A past that even his beloved brother barely even knows of. A past that he wishes could remain a secret. But when the questions start be...
Completed
Runaway by DevinGaming321
#4
Runawayby DevinGaming321
Finally. They made it to the surface. But after an attack on the monster king, Undyne reveals a hidden secret that destroys the group. Can they bring themselves back tog...
Completed
Undertale Yellow: Genocide's aftermath by Aaron2751
#5
Undertale Yellow: Genocide's after...by I burned the water
Long ago, two races ruled over Earth. Humans and Monsters. One day, a war broke out between the two. In the end, the humans are victorious. They sealed the monsters with...
Completed
Mr.  Erratum by SleepyPersonHere
#6
Mr. Erratumby SleepyPersonHere
Error can take it no longer. After centuries of Pain and suffering, Error no longer cares what happens to the people who caused him pain, and now wants to leave the plac...
Undertale React by MysteriousPerson0193
#7
Undertale Reactby ----
Undertale is going to react. This will not be entirely canon and will include aspects of what I believe (backstories, ect.) I do not own the cover and I do not own any o...
Completed
(Sans x Reader) When Two Souls Meet by ZanaBSparrows
#8
(Sans x Reader) When Two Souls Meetby Zana B Sparrows
Sans has lived through countless timelines. He's seen the kid make friends with everyone, only to give up in the final moments. He's seen the kid killed, over and over a...
Completed
Somethings Changed by Moonstone_Ccino
#9
Somethings Changedby Moonstone_Ccino
Nightmare already has a hard life in the village. from all the bullying, to things being thrown at him, to people trying to steal the golden apples from the tree that ho...
Reborn In UNDERTALE!? by Nova_The_Supernora
#10
Reborn In UNDERTALE!?by StelleFont
I was just a 19 year old, living my mundane life, until I died... and was REINCARNATED!? And not only that, I was reborn in the famous videogame release in 2015 Undertal...
The Time Before (Undertale) by ANinnyMouse42
#11
The Time Before (Undertale)by ANinnyMouse42
~o0o~ Book 1 of the "Better Times" trilogy ~o0o~ (Book two: "A Name to Remember") (Book three: "No One is Happy with This") There was a tim...
Completed
Voidheart [Female Chara x Male Reader] by shyboi69
#12
Voidheart [Female Chara x Male Rea...by Shybo
"You shall seal the blinding light light that plagues Human and Monster dreams You are the vessel You are the Hollow Knight" •Somewhat of a reboot of Someth...
What We Hope For (Sans X Reader) ✨UNDER EDITING✨ by Grace97721
#13
What We Hope For (Sans X Reader) ✨...by Grace
Everyone has a happy ending. If you're not happy it's not the end . . . . •°•°☆°•°• Y/n (that being you) fell into the underground...
Completed
Undertale X Reader by Frei_111
#14
Undertale X Readerby Frei_111
You woke up on bed of golden flowers without having anything to remember. Going to an adventure where you met with many monsters to go home. Easy, right? Not really, act...
Completed
Bruised To The Bone: (Sans x Reader) by sweetisbored_
#15
Bruised To The Bone: (Sans x Reade...by sweet.is.bored_
(Y/N). A peculiar soul; A human core, with a skeleton's power. Her parents are ashamed of her, beating her every time they catch her using magic. One day, she accidental...
Completed
Royal Blue by dealialestina
#16
Royal Blueby Spilled-my-coffee
Sans knows a lot about secrets; he hides many. But when old burdens emerge from the darkness, secrets, new and old, put his brother in danger; and what else can a good b...
Welcome to the Future  by SpiritWolfNura
#17
Welcome to the Future by Kyran Wolfe
For 130+ years, monsters have been extinct with the only things left behind having been their hybrid children. Over the years as the hybrids continued to reproduce and 8...
"It's a Beautiful Day Outside... by Septiplyierfangirl
#18
"It's a Beautiful Day Outside...by Septiplyierfangirl
......"It's a beautiful night today. The stars are twinkling, the crickets are chirping...On nights like these, villains like you, should be burning in hell"...
Completed
Undertale x male reader by RandomKid362
#19
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...
Unexpected Love | Sans x Reader by dacatnxtdoor
#20
Unexpected Love | Sans x Readerby mal ✩ˎˊ˗
You climbed the famous Mt. Ebott to prove to a group of your friends that humans don't disappear when they go up the mountain. While walking around the peak, you trip ov...
Completed