Undertale-fanfiction Stories

What would happen, If a single moment changed? A single moment that decides the future of a race... A moment that, If unaltered, would mean the difference for the surviv...

NOTE: PLEASE DEAR GOD DO NOT READ THIS. This is not the updated version, I published a few of the parts only so my friend could read it out loud in a dramatic reading we...

This is a story about you aka the human in a underground

I know that there are already stories of the Tale of the perseverance soul, from being shipped with gaster and have a hand in creating them or being the skeleton brother...

UnderShard is an Undertale AU where there is a glitch as a result of a hacker trying to implement their own character into the game. (Special thanks to @America50_Areic...

My random obscure AU's post-game story. Frisk and their battle assistants, Figna, Astra, Icara and Miseri, formally known as FIGHT, ACT, ITEM and MERCY, thought they had...