Undyne Stories

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...

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...

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...

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...

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...

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 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...

Yup! They're back! A thing I started back in my older account UndertaleKyannaKitty. They're your siblings now! Cute, edgy, as much angst as you want, sad-whatever! Reque...

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...

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...

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...

"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...

Clover doesn't give up his soul because justice still needs to be delivered. The Wild East, and later practically the entire Dunes, declares independence. They declare...

~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...

~o0o~ Book 3 of the "Better Times" trilogy ~o0o~ (Book one: "The Time Before") (Book two: "A Name to Remember") Two years after the Barrier...

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...

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...

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...

(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...

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...