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...

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...

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...

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...

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...

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...

(This is my first time writing a story in a while, so it will most likely have a lot of mistakes. This story is based on a story I wrote on Quotev, called "Baby Bon...

status; ongoing‚ probably updates on wednesdays. » slowburn, action, romance, comedy. ✧ art belongs to @ProductionRoxy ✧ nightmare sans belongs to jokublog ✧ reader x va...

Y/n possess a unique soul a soul even more rare than determination,Chaos. What will happen when he happens upon two girls who peek his interest?

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 "...

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...

Error has a simple job: rid the multiverse of all its anomalies. So, when an AU stranger than the rest suddenly loses its Frisk, he takes it as an open invitation to des...

[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...

Mad Dummy possesses a dummy in the hot topic store you work at. Shenanigans ensue. Headcanon/idea from @stickfigurewar I do not own Undertale or its aus and this was mea...