Undertalefanfiction Stories

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...

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...

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...

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

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...

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...

[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...

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...

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...

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 "...

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...

UnderTale. The place where all the underground is crawling with monsters who were trapped down there thanks to the humans. The fallen child: Chara Dreemur. Only half the...

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...

This is a story of Horror perspective from the AU I made that I will probably call.. "the casual" (idk I'm still thinking for the name) This story might have a...

That's right Ladies and Gentlemen, special long oneshots of our beloved Undertale Monsters! (Requests closed)

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

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...

(y/n)(l/n) is a werewolf from the White Hills pack. You are the only survivor from an attack from the Red Lills Pack. Being on your own at the age of six, you struggles...

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...