Gaster Stories

"What's that look for? Are you perhaps unhappy to see me?" "Oh no. Oh no, quite the contrary, my love. I've craved to be with you for the longest time&quo...

Almost four years marking the anniversary of monster kind reaching the surface, the human ambassador Frisk goes missing. Severing the link between the two species, an al...

W.D. Gaster never meant to fall in love during the war. But he did. It resulted in heartbreak, a pup, and a high LV. So he experimented. 10 years and no more kid. So he...

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 has lived through countless timelines. He's seen the kid make friends with everyone, only to give up in the final moments. He's seen the kid killed, over and over a...

He wakes up in a white place... (Man wakes up as a alternate version of Cross Sans,neat,the cover is mine..Cross Sans is not mine or any Sans you will see besides this a...

He went blind in a freak accident at the lab. Now all he 'sees' is darkness. Until.. he meets you.

What happens when the Gaster Gang handle a human child situation? Read and find out! Based from Bun-bunmuse art story. ps. the reader is 5 year old girl ?

Either I update fast or you'll wait a month no in between. Normally fast but no promises- #WARNING# Contain slight cursing, boy X boy, sh, torture, blood, possible smut...

Error didn't know what to expect after being pushed into the Void. He didn't expect to be transformed into a teenager. He didn't expect to fall into a world full of drag...

Yes there will be mistakes >:3

A/n: I got some inspiration from another story, I'll try not to make it a carbon copy. Gremory Rose, to be exact. The forgotten child. The Cursed One. Such cruel names t...

??? was a fan of undertale heavily but when she suddenly got hit with a truck (because everyone dies from trucks when they get isekaied.)she was expecting to be dead so...

I don't own Undertale or any images.

Here we go! All images shown are not mine. Cover is by Bunnymuse. Highest Rank: 48 in Fan fiction

💀I did not originally write this, it's just a story I found that I rlly liked, 💀 it's a lemon fic of reader x goopy gaster, this contains adult themes such as breeding...

Gaster, the Royal Scientist created best of his invention. Core of Hotland. But there was an accident that ended his life. As a result of the crash at launch, he fell di...

Let's get this over with... HIGHEST RANKING: #35 in Fanfiction June, 23, 2017 ALL IMAGES USED ARE NOT MINE! Cover was made by Bunnymuse on her Tumbler (I think). Bunnym...

The barrier has been broken. Not due to SOULs, but due to a successful experiment by Doctor Gaster. Now, monsters must assimilate into the human world, where, apparently...

The Sanses got teleported(kidnapped) by me and they will react to Error aka the God of Destruction's past.