Select All
  • Idealistic: Gaster x Reader {Completed}
    57.1K 1.8K 46

    *front cover belongs to me* It's another beautiful day in the Big Apple, and what better way to celebrate it than to go to your new work. What will you learn? How will the events unfolding lead to love? This whole book is now cringe to me. I forget how chaotic this fan base is. :p

    Completed  
  • Prisoner of War (W.D. Gaster X Reader)
    46.5K 1.7K 14

    You are one of the few humans with magic during a war between you and the monsters. (Pre Undertale) Instead of killed you wind up captured by the monsters where you meet a scientist and doctor W.D. Gaster. Cover... I drew it myself this time

  • Coffee Shop - Gaster x Reader
    8.9K 363 8

    Just a little thing from my DeviantArt

  • FRUIT OF THE VOID (Gaster X Reader)
    17.2K 792 12

    Dark, darker, yet darker. The darkness keeps growing in your life. You don't know why, but there's someone relentlessly haunting you. He won't leave you alone, and every dream you have is a nightmare. It seems peace is currently impossible for you. What great evil could possibly want to harm you? You never felt that...

  • HP (W.D. Gaster x Reader)
    57.3K 1.8K 20

    You lost your father in the war against the monsters. If it was up to you every last being that fought against man would be sent to execution. But it wasn't your choice.... unless it was? That's when you decide to visit the underground. All you needed was one excuse to rage another war against the monsters this time...

  • A Mask Of Scars (Gaster x Reader) (ON HOLD)
    10.4K 475 32

    This story is old and the big ew. Please don't read until I change the bio or I will commit slip n' slide, sauce on the side, sewer slide.

  • The void in my heart (Gaster X Reader)
    29.6K 812 22

    You're a human girl, living on the surface with Frisk, who is your younger sibling. You one day find two children, who's been chased away from neighborhood to neighborhood. And with you're kind soul, you couldn't leave them to live in the streets. You take them in, and meet their father. But will one day, lose them, b...

    Completed  
  • Glowing Souls (Gaster x Reader)
    7.8K 242 8

    You are about 15, Gaster is 17. In this Gaster is an older brother to Sans and Paps. Asriel is about 6 along with Frisk and Chara, who show up later. You and Sans are best friends, but Gaster is amazing! At age 17 he is the royal scientist and you hope you can help him out.

  • The War Amongst Us (W.D. Gaster X Reader)
    64.4K 2.9K 24

    (Y\N) is a young female spy and soldier fighting in the War of Humans and Monsters. She is fighting on the humans' side of the war until a turn of events when she becomes apprehended by the enemy. What will happen when a young monster scientist tries to change her views? Thanks to Itachei on Deviantart for letting me...

  • [COMPLETED] Gaster Gang x Reader Oneshots!
    57K 1.2K 37

    Ok I have never done a oneshot book before -_- WARNING: VERY SLOW UPDATES let's get the first thing out of the way- I don't under any circumstances own: -The Gaster Gang by Bunnymuse -Undertale by Toby Fox -Any art -Any YouTube videos let's see which characters you will be shipped with- -WingDings: Undertale -Swap: U...

    Completed  
  • We Studied and We Fought and We Killed [WD Gaster x Reader]DISCONTINUED
    3.3K 104 14

    !!!DISCONTINUED!!!(Before we get into what this story is about, I would like to clarify a few things. this story may contain some Hamilton references. It won't have any smut because I get awkward at those parts. The most that will happen is kissing. If you want me to make a smut chapter, comment. My notes during the s...

  • Chipper Fellow (W.D. Gaster X Reader)
    9.8K 335 6

    chip·per ˈCHipər/ adjective/informal cheerful and lively _____________________ Not everyone would've described this skeleton man as 'chipper' at first glance. But [Y/N], someone with first-hand experience on how he acts, would definitely describe him as such.

  • UnderTale Oneshots (FINISHED)
    2.4M 48.4K 204

    (I DO NOT WRITE ABOUT UNDERTALE ANYMORE SO PLEASE DON'T REQUEST ON MY CHAPTERS) (AND FOR THE LOVE OF GOD STOP COMMENTING ABOUT MY GRAMMAR, I AM SWEDISH AND I HAD A HARD TIME LEARNING THE ENGLISH GRAMMAR. I'M MUCH BETTER AT ENGLISH NOW) This is my oneshots of UnderTale. It invloes AU'S to! Background picture by Casper...

    Completed  
  • Dark, darker, yet darker ~ Undertale Gaster x Male Reader
    601 14 4

    Y/N was tired of his mother's abuse, and decided he eventually had enough, and quickly ran away. It's so dark outside, he doesn't notice the big hole in the ground, until he's falling... I don't wanna spoil too much haha Contains abuse, people swearing. Cover is made by me. Characters are not mine, the game was made...

  • Gaster x Reader- Not Your Fault
    106K 3.3K 13

    You're a human who has fallen down into the underground. There you meet a certain skeletal scientist and his sons. Will you get close to the family or will you become their enemy. Loosely based on TheBombDiggity666 Dadster comics (which you should totally check out if you haven't already) and occurs before frisk's ap...

    Completed  
  • Gaster x Reader (Probably will be a Lemon)
    36.5K 815 8

    So I was really inspired to keep writing stories by someone who commented on one of my stories. You know who you are. I've been on here a lot and I've seen people actually reading my books... I'm so happy ^_^ Anyway... A backstory and How to read an X reader will be the first chapter... This'll probably end up being a...

  • Gaster x Reader: Trusting The Man Who Speaks In Hands
    39K 1K 12

    Your walking through waterfall when a door you've never seen before, materializes before your eyes. When you open the door you see him...

    Mature
  • - My Angel from the Sky - Gaster x Reader
    88.7K 3.1K 30

    Suddenly you find yourself in the Underground, with no memories and an unknown and painful past. Your first encounter is Flowey and he tells you how weird and different your soul is. What does it mean ? What happened to you ? A fated meeting awaits you. The beginning of everything. THE UNDERTALE P.S (GasterxReader) Th...

  • Subject 108 (Gaster x Reader)
    37.4K 1.5K 59

    Under editing Every-night you dreamt of a strange man, the strange Dr W.D Gaster who you fell madly in love with. With each passing day you grew closer and closer, but everyone has secrets... Even the seemingly perfect Dr Gaster. (WARNING GORE, SWEARING AND LEMONS) Cover art by @Redwolf878

    Mature
  • Functioning With Society | W.D. Gaster x Reader
    9.1K 430 12

    After adventure comes a happy ending. That's at least what the world tries to teach us. They whisper a "the end" but the tale still strives. Maybe it's not written, or coded, but it continues in your mind. Though, this is reality. It was a surprise that the monsters were able to grasp freedom after so many years of...

    Mature
  • ∆°{The Darkest Souls}°∆ | Gaster x Reader
    14.8K 593 7

    When the monsters were sealed in the Underground, a few humans, still loyal to monsterkind, went with. (Y/N) Was one of them. She was a Scientist, one of the most brilliant minds of the monster world, and ended up working alongside the Royal Scientist. W. D. Gaster. And, despite her knowing better, began to grow attac...

  • Gaster x reader
    13.6K 250 30

    In this book I plan to do one shots for Gaster the royal scientist, for the underground. Requests are accepted and would really help in the making of this oneshot book. I will not do lemons due to the fact that...... (Throws hands in air and falls to knees) I do not know how to!! anyways hope you like the book. Since...

  • W. D. Gaster x Reader
    186K 3.2K 42

    A collection of one shots between you and the man who speaks in hands. Some will be long, some will be short, some will be happy, some will be angsty, some will be fluffy, some will be smutty. I will write for certain AU's, but don't be offended if I ask for an explanation of the AU you request, I don't know them all...

    Completed   Mature
  • Gaster x Reader
    159K 4.2K 61

    Pretty self explanatory. This takes place after the Pacifist route in Undertale. Through determination, Frisk was able to bring back Chara, Asriel (Asriel is Flowey per say), and Gaster. I believe that Gaster is the father of Sans and Papyrus. I also don't believe that Chara is evil. The monsters are on the surface, a...

    Completed