Gaster(#1)
8 stories
Undertale (Completed) by HaruNoBara
HaruNoBara
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You were a nice monster and you took care of skeleton brothers because their father was a royal scientist so he didn't have a time to do that and their real mother died but you took care of all child monsters. What happens when Gaster gets killed by a human? Will you survive? Or will you die?
Undertale: The Third Sibling by Musicalhorse01
Musicalhorse01
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It was just a peaceful day in Snowdin. Everyone was just doing what they normally do in the underground. The Nicecream guy kept selling, monster kid was playing around, Grillby was cleaning up some spilled ketchup. Even in the Skeleton household, Sans was chillin in his room while Papyrus was working on his spaghetti. But not everything is what it seems Suddenly, a loud thump was heard outside of the brothers house... ~~~~ Hewo!!! This is my first Undertail story ^~^ hope you all enjoy this as much as me writing it! Highest ratings: #1 sans #1 gaster #1 outer #2 ink #5 blueberry #6 undertale
For Your Sake (Gaster!Sans X Reader) by BanthaBug
BanthaBug
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    Parts 20
THIS IS A SEQUEL BOOK!!! IF YOU HAVE NOT READ THE FIRST BOOK YET THEN GO FIND IT ON MY PROFILE!!! Anyway, now for the summary: After death, you hadn't expected much to happen. You fell immediately into a place like the void. You just wanted to reconcile for what you'd caused, but your heart had a wish of its own. You wished to turn back the clock and set things right. You wanted to make everyone forget your existence and make them happy again, even if it left you alone. Well, you're one of the lucky ones. You're wish came true and you reset time. But not everything went to plan.
Blown Through The Rift (Gaster!Sans X Reader)  by BanthaBug
BanthaBug
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You were working with Alphys in the lab in Undertale when chaos strikes! In a freak accident, concentrated determination is mixed with an unnamed concoction and blow you through a dimensional rift. When you reawake, you find yourself in what seems to be the beginning of Undertale once again. Upset but not overly surprised, you make your way back to Alphys's lab... Only to find her lab assistant is no longer you! Working with Alphys now is a tall, punkish skeleton with two cracks in his skull and a snarky attitude. As they help you find your way home, will you find more than that? *I DO NOT OWN UNDERTALE OR GASTERTALE!!! I WISH I DID BUT I DO NOT! THIS IS JUST A FANFICTION!!*
Hold Still GXReader by EternalKimFlame
EternalKimFlame
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    Parts 45
I walked along the street. Everything was perfectly normal. The sun was warm, a soft breeze swept through my short (h/c) hair. Then the sound of glass shattering reached my ears making me jump. A bit frightened I backed away from the sound when something wrapped around my waist and I suddenly felt like someone was spinning me through the air. My feet hit carpet before I was tossed on a couch. "Move and you'll get your little neck snapped."
Why? • Gaster!Sans x Human!Reader by sansisnotonfire
sansisnotonfire
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'When I was 13, I killed someone. By accident of course... It was the day I found out I possessed some type of power.' You kept it to yourself for years until one day it all went wrong. For your own safety you run away to the depths of Mt. Ebott in hope that the legend was true. But once you fell down you start to realise that this may not be the first time... "You've been here before, Y/N. And this time I won't let you run"
The  Original (An Undertale Fan Fiction) by SkeleMatcha
SkeleMatcha
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Y/n is Sans and Papyrus' older sister. She has found a way back from the void and has to learn how to adjust to life back in the real world. She was the first to be created by W.D. Gaster, but a malfunction happened during her creation and she turned out to look more human than skeleton. Her only resemblance to a skeleton is her nose and her pale skin. Pictures do not belong to me.
Person of Interest by Ginger1101
Ginger1101
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    Parts 13
It was twelve AM on a friday night- or saturday morning. You'd just finished working a double at the bar; tired and achy as all hell, all you wanted was get home and get off your feet for the first time in fifteen damn hours. You were almost home, just one block off from your apartment; maybe if you'd left work just a few minutes earlier or later, you could have avoided what happened next... But you didn't.