Undertalefanfiction Stories

[COMPLETED | Undertale x Reader] * There is another one of these collections of the famous game "Undertale" with the reader in it. * It fills you with determin...

Y/N's best friend Blueberry (also known as Underswap Sans) invited them to move into the shared/connected apartment next door. They could hang out all the time! It's an...

Cold. Everything was cold. And dark. I was so alone... how could I have wanted this? This couldn't possibly be better than before... the warmth, and the light, and the...

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...

Gaster is the current royal scientist, set with a mission to break the barrier and free monster-kind from their underground prison. His loyalty and persistence to the ta...

FRANS This is a request and I have been really exited to start writing it! I really hope you like it! Echotale is not my AU! Neither is Jailtale! This is just my own lit...

DRAMA, ACTION, BLOODSHED... Love? After erasing hundreds and hundreds of timelines, Chara is suddenly stripped of her abilities. She's forced to lead an everyday life i...

Y/N's been traded and sold her entire life. She's learned firsthand that if you don't obey your master, you get hurt. If you force yourself to listen, you live another d...

Y/N is a normal girl, exept her soul has two sides the soul of dreams and hopes and the soul of hate and fears, which makes her unstable as a person. She has two brother...

Suddenly you find yourself in the Underground, with no memories and an unknown and painful past. Your first encounter is Flowey and he tells you how weird and different...

(_)_(_)_(_)_(_)_(_) " ....so what your saying is...you don't trust me anymore... " " What?? N-No!! Palette!! Of course I trust you!! " " then wH...

The Universe is vast. And if there is anything confusing that having two of yourself, it is having a vast plethora of others similar to yourself, that have the same name...

This is my first book and I'll try to update on Fridays. Anyways, this story is about a girl who was a teen when she fell down the hole in Mt. Ebott and lived with Torie...

One-shots about the superstar robot and you, the reader. There will be fluff (mostly), some steamy ones, and possibly more. I hope you enjoy reading these! #1 number in...

-FIRST BOOK OF THREE- Ever since the War, magic humans have been training to kill all monsters when they escape. They've even built a special school designed for teachin...

You have lived in the underground for 4 months now, and had befriended the most adorable cinnamon roll ever, Sans. However, you couldn't help but to gain feelings for hi...

The war between the two guardian rulers and their kingdoms lasted for countless generations. Then came the news that Nightmare went ahead and got himself some new "...

Flowerfell is an AU (alternate universe) of another AU called Underfell which is an AU from Undertale. If you don't know what Undertale is you will not understand any of...

[2nd book] A Yandere Underfell Mettaton x reader story After Y/n falls down, they meet someone to help them throughout their way back home. Somehow they become very good...

(Y/N) has known the Star Sanses for a year or so now. But as of this moment, her and Ink are the only two who aren't in trouble. Blue has been kidnapped. Dream was turne...