Gaster Stories

In this world, when Error leaped off the edge, he took Ink with him. (Cover art and any story art is mine)

Your favorite skeleton is back at it again... and again... agagaagaag Sans has had enough. Everyone is at the surface, holding their own jobs and lives. But... Sans can't ever let it fade from his mind. The dust. The cries. Watching the screen with Alphys as a child just rampaged in the underground. He is going to snap. He is mad. He is sad. He can never forget. Cover is NOT mine, find it online if you want ::Rights for the original concept and media 'Undertale' are all under the jurisdiction of Toby Fox. All other workings are done by me.::

Abandoned on Mt. Ebott at the tender age of five, young Harry's unsurprisingly died, but Death's always had a weird relationship with his variant... Meanwhile, before Flowey's revival as souless talking flower, Sans makes a discovery under the mound of snow, Papyrus has always wanted to be a big brother anyways. *Edited Summary (29/09/2025)

(Completely Un-Edited Version Except For The Disclaimer And Part/Chapter Date, For Those Who Would Like The Original Reading Experience) (Disclaimer) This is by @Shyboxes. I am archiving this with permission so people will still be able to read it. :) ----------------------------------------------------------------------------------------------------------------------------- • I reccomend you do not read this, this is my worst work yet despite it being my first. There is another story on my profile that is under development and editing. Other than that everything else here has remained untouched for over two years. DISCLAIMER: i do not own undertale nor any videos, pictures, intro, etc. And i reccomend checking out the original creators You are an ordinary teen or are you with a weird crystal appearing right next to your bed with it telling you strange things and having an encounter with a flower saying you soul is special are you really normal and is the senior year of high school really be normal with monsters starting to teach and attend school will your life really be normal?

You are the elder brother of Frisk. I'll explain later. This book will not be updated for a while, sorry. Completed: December 2nd, 2020 SC Book# 12

Deltarune - The Harem Soul is set in an alternate universe of Deltarune, where the prophecy has already been fulfilled and the world has returned to peace. However, instead of ending, the timeline is reset by the Soul itself, which chooses to begin the story again. This time, the reset is flawed. Small anomalies and unforeseen inconveniences break the original flow of fate, allowing the story to change in unexpected ways. Kris awakens once more in a familiar world, but events no longer follow the same path, and new connections and outcomes become possible. What was once a completed legend now becomes a living, shifting story-one that can be rewritten.

On a dark, windy and rainy night in a bad part of Chicago, a skeleton named G, walked home from work. He doesn't normally walk home, preferring his motercycle, or even his teleportation powers. But something made him walk this night. Fate. G finds himself saving a young girl from a horrific death, and then taking her home to keep her alive. What he didn't expect, was for the girl, much older than first appeared, to flip his whole world upside down. A curse, layed on his SOUL many years ago, may have the second chance of being broken, but DEATH has other plans. To make matters worse, the girl has a deadly disease, with little hope of survival. Can G save the girl who he has sworn to protect and take care of? And in turn, can the girl break his curse, and let him finally live the life he was ment to? 《GasterSansXOC》 (Frequent updates, and this promises to be a very long book)

Is it still considered a backstory if the protagonist doesn't exist? Companion story to "Reset".

A bunch of Undertale short stories! ... Which, despite the cover, are not only about Frisk, Flowey, Alphys, and Sans. There are other characters in there too. Aww, who'm I kidding? Probably 90% of this is skelefam fluff 'n' feels.

ARE YOU THERE? ARE WE CONNECTED? EXCELLENT. How interesting, he's trying to connect with THEM. Hmm, what if we...there, let's how this experiment within an experiment goes. Let us hope we don't experience any significant GLITCHES (if we do let's hope it doesn't change anything). Do I own the art? Unless said otherwise no. Do I own Deltarune and Undertale? No, why would I make this if I did? #10 in Survey 7/6/2022 #6 in Survey 8/15/2022 #5 in Survey 3/28/2023 #54 in chapter2 6/02/2023 #33 in chapter2 04/01/24

Sans is going to be the hero, again, like always... It all started with a human child named Frisk who did Genocide multiple times in a row. They were frustrated, tired, having an urge to give up. But they spotted a Time Machine that came out of nowhere and decided to kill Sans's Past Self. Will Sans save his Past Self from being killed? Will we know the reason why Frisk is doing Genocide? We'll know in this story. ((Undertale by Toby Fox, Picture is not mine and I give credit whoever made it, and the story is by ME)) SPOILER ALERT FOR THE GAME!!!!!

" what am i supposed to do? " | Underfell AU | ©︎ 2018

Underfell is a dark world with the major rule of kill or be killed. Even though children are suppose to be secluded from this rule, that doesn't stop monsters from hurting children. Undyne is a monster who lives in Waterfall. Under the care of Gerson. One day while out on a walk the fish monster stumbles across a baby. Though it wasn't any monster. It was a small little baby skeleton. (the cover is only temporary, until I'm able to make a cover for the story)

Gaster the royal scientist dark reality, you've seen the boys. You THINK you know there backstory. It's time for a harsh truth about Sans and Papyrus you never thought you would hear This story is based around my friends theory that Sans and Papyrus in a sense where 'made' by Gaster.

[3rd book] So it's yandere Undertale One shots because I can. Also because some characters just kinda need to be more recognize. Slow updates? Or it will just Update at random. Also there might be some errors so sorry about that. Started - 4/9/23 Ended - 5/31/24 I don't own Undertale or the Characters! Not the Cover I just edited it!

Here ya go pplz. Tween: Short for Tweenager: 8-14 years old (I know, weird)

Blue has fell, literally, into the Underfell Universe. When he gets there, he is captured by the Papyrus there and struggles to find a way back home to his friends. Things develop become interesting when both start to realize they have feelings for each other. Read the updated one, it is Fell For You: Rewritten, it is finished and updated.

The young skelebros escape from the core and head to Snowdin. Grillby finds them decides to take them in but finds out it may be much more difficult than he thought. Papyrus likes Grillby but it takes Sans some time before fully trusting him and even then there are things that he doesn't want to share. Although Sans struggles with his magic and with meeting new monsters. But, he's able to find some close friends when situations get rough. Ik my art is kinda weird but it was mostly just for fun. I'm definitely no artist. All art is still mine tho. I won't edit much here. Fully edited story on Archive of Our Own. Same name as here.

Ten years ago Dr. Gaster created life by using monster and human DNA. His plan was to use the creature to shatter the barrier without relying on the seven human souls. Something went wrong, only his children can put things right again. ((Warning: OC, self-hatred, violence, LGBT, death, a bit of profanity, emotional abuse, lewd and suggestive adult theme))

The genocides never seemed to end, until they did. Something happened, something that threw Sans into another world where he must adapt. All while trying to stop a killer and save his family and friends. Here is the rewritten version of my first story. This fic contains swearwords, violence, blood, death, intrusive thoughts, murder/ attempted murder, If you are sensitive to this sort of thing then I recommend you proceed with caution. *I do not own Undertale or Bnha in any way. *The cover art is drawn by me.