Undertale Stories

TW: Swearing and slight gore Y/N reincarnates in the anti-void as a Voice... Will he befriend error or will they make them hate their guts? And will they meet other peop...

Cover image made by me. Someone meets their end too soon and meets someone who gives them another chance to live a more fulfilling life. One that they would enjoy despit...

#1 of 61.7k tagged with Undertale 12/06/24 After drowning as a human, Ashe reawakens as a DustTale variant of Sans. With his ghost Papy helping keep him from falling int...

You didn't have a bucket list or anything, but you wished you could've at least read a few more fanfics or done literally anything fun before dying. Oh well, at least yo...

What if someone became papyrus from underswap? What if they gave their brother more freedom? What if they were the one that error kidnapped instead of sans? (Things wil...

Do you know what it's like to know your future? Do you know what it's like for no matter what you do, you only seem to make things worse? Do you know what it's like to a...

Bitty! US pap x reader x Bitty! US sans Our two little bitties have been through a lot, so what happens when they meet a human that's hurting just as much as they are...

what if someone in our world becomes US!sans also known as blueberry?

What if someone from our world died knowing a lot from the undertale and their multiverse/underverse? What if that person also knew about the balance and didn't creat to...

Since there's not enough x bitty reader stories out there. You are a stray bitty who ran away from your last abusive owner and run into someone who will change your...

There are two known guardians that watch over and protect the multiverse. Such as Undertale, UnderSwap, UnderFell, etc. These two guardians are named Ink!sans and Error...

Frisk, with the power of Determimation, reached the end of her Journey. Releasing the Monsters from their Mountain and back to the Surface, everything seemed perfect. 5...

You are drinking hot chocolate in your room, but suddenly a loud noise comes out of the kitchen. What is going to happend next? (Pic not mine and unlike the picture, the...

What if someone died and became the tree of feelings from dreamtale? Well things won't stay the same, that's for sure. (Different everything etc, different personalities...

"Your human right?" "No. I would never want to be like them." "But your not a monster?" "Like I said...I'm not a human or monster. I'm...

Dear, Nightmare, Cross, Error, Dust, Horror, Killer, Lust, Reaper, Geno, Ink, Dream, Blue Hey guys, It's me...Sci, So uh, I've just discovered something really cool. And...

Aster Corvus Concord, now known as Sans Serif Gaster, was living a relatively peaceful life having reached the surface. Then it all reset. Now, after living through an e...

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...

Yeah sorry gained an idea on if someone became swap Gaster Also they may be apathetic or just confused on their feelings and MAYBE Autistic, I may be a bit wrong on ap...

Sans had finally killed the human. He doesn't know why, but they just stopped coming back. He took their soul and, using the other 6 human souls, broke the barrier. Al...