Undertalefanfiction Stories

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...

English version Welcome to "UnderWhat?!" (UW for short) In this What-If AU, Frisk has pushed the Underground's reset button to its limits, leaving cracks in th...

[✋ ✌💣 💧❄✋☹☹ ☟☜☼☜] After your journey through the underground, despite saving everyone. You still felt like something was missing. Something or maybe someone.

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...

When Sans first defended the lone human that fell, Kolton, he didn't expect for his scientist of a father to take care of him . . . nor the boy's two older siblings, War...

As fragile as glass. The definition of one's soul despite the being stoic and cold. Even though you're the toughest monster alive, your heart is soft as a pillow. Sans...

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...

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 "...

Sam, a Young boy who lived his best life with His Family, is just about to have his Life CHANGED. Sam is 8 years old, he has a Little brother, and a Father. His Family...

During your teen years, you came to the mortifying realization you have magic. Maybe once upon a time, that would've been useful, but not only are humans not supposed to...

-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...

Three years before Undertale: Silver toke place, an evil robot that is red appears in the universe and Undyne has to defeat the robot.

Frisk severely breaks the timeline trying to attempt anything to actually finish the game of Undertale. Eventually they give up and give their soul to Chara after breaki...

Frisk is a 18 year-old young man who just graduated high school. He arranges a hiking trip with his best friend Jack, which leads to him falling in a mysterious hole. Ca...

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

Ok ok hear me out I know this might be cringey but just hear me out. A human named Maryellen falls into the underground instead of Frisk, see how different the story pla...

"Undertale: Echoes of Determination" is a captivating fanfiction that extends the beloved world of Undertale with new adventures, mysteries, and challenges. Th...

When the monsters mysteriously vanish, the restored Prince Asriel must ally with Temmie, the enigmatic River Person, former Royal Scientist Dr. W.D. Gaster, and his old...

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...

This is a couple short stories about my travels through the multiverse, mostly Undertale AUs. I just wanted to write something that I actually can enjoy and not feel too...