Undertale <333
50 stories
Human (Gaster X reader) by ghostlycupcake
ghostlycupcake
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COMPLETE!!! This story is in the past! It plays off the idea that sans and papyrus are Gaster's kids. Being the past it means that his kids aren't born/created yet. Also monster kid, Frisk, Chara, and Asriel aren't born/created
My One and Bonely (Sans x Reader) by Flutterbat276
Flutterbat276
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My first story. It's a sans x reader fic, so don't judge too harshly. Also I have some bad pacing issues, but I hope yall will ignore them. Anyways on with the summary! You see monsters everywhere. All of theme unique and friendly. You ask "how could anyone hate them?" When you save one of them, you're life takes a drastic turn.....for the better. Highest rank: #16 in Undertale (June 2020)
Forget Me Not (Dt Sans X Reader) by MegaphoneDouche
MegaphoneDouche
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It wasn't your fault you were in this situation. It just happened at random chance, now you were stuck in a loop. A endless repetitive loop of death and obsessive love. He wanted to keep you forever, and if it meant becoming a monster worse than anything, he'd be okay with it. After all, he LOVED you~ Heyyyyy Something I came up with, don't know if ill be doing smut with it or not, buuut hey, it's DT Sans, people seem to like him, updates will be slow, but please be patient!! :P Besides I don't think there's enough love for DT. Lol no regrets writing this whatsoever since DT Sans is bae for me ;) (June 5th: Lies, I have a new bae now ;-; and it's Horror Sans) Btw if gore and such makes you uncomfortable, I'm sorry my dude, but that's whats gonna be in this book. And some heavy angst between you the reader and Sans of course.. But of course budding romance!!! (I think..?) Verrrrry verrrrryyyy slow burn Tags will be added along the way
Stone Cold Pacifist (Horror Sans x Reader) by ReapingZen
ReapingZen
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PLEASE READ BEFORE GETTING INTO THE STORY. Your name is (Y/n), and you play the role of an unusual pacifist. In the story of Horrortale, your unique soul allows you to see WD Gaster who no longer holds a powerful connection with the underground due to the inactive core. After your parents are killed, Gaster makes a deal with you. He will help you extract revenge on your parent's murderer, and in return... you were going to fix the core in the underground. While Sans failed to do it when everyone went insane, you knew what you had to do because well. The creator of the core told you everything that you needed to know. The real trick isn't the resources that you've been gathering during your time on the surface for the job, it's the things that are in the underground that you have yet to obtain. While it is true that you have a lot of experience with fighting and a high amount of LV thanks to Gaster's guidance... you now decided to stop killing, and start saving. ...... But can a stone cold pacifist truly manage her way through Horrortale? Okay, a quick note. This story is rated mature, blood, gore, some more sensitive things that you might find extremely suggestive. Since people are enjoying my Nightmare x Reader story, I decided to do a little bit extra. My updates with this book will be a bit slower. (Totally didn't write this story because I wanted to do a drawing of horror for the cover.) This story is kind of a slow burn, but unlike my other story, the reader is no pushover. Like in the The King's Queen, the cover DOES belong to me, so please do not steal it, etc. Remember these important keys when it comes to reading the story! (Y/n): Your name (E/c): Eye color (H/l): Hair Length (H/c): Hair color (S/c): Skin color (F/c): Favorite color
A Tree, For Us (Sans X Reader) by TheAbandonedQuiche
TheAbandonedQuiche
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CONTAINS SPOILERS FROM BOTH PACIFIST AND GENOCIDE RUNS After a horrible situation, I (Y/N) scaped from home to avenge my (sibling). In a failed attempt, I got lost and fell through a hole, in there I found another world... "the underground". I meet many friendly monsters, one, specifically, changed my whole life. Both of us will try to give the monsters the liberty they deserve. And this is how all happened... (Cover made by me :3)
CREEPY SMILES |Gaster x Reader by Krounus
Krounus
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You've always have had a creepy smile, and it doesn't help that you have these scars on your face now.... It doesn't matter though, you're fine with it, and he's happy too... Simple Gaster X Reader fic, I hope everyone enjoys!
Artificial Love Of A Skeleton (Gaster x Reader) ARTBOOK  by Beauty_But_Deadly
Beauty_But_Deadly
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Yes, the whole thing is made with arts. not words. I'm lazy to type. Btw this is Undertale and the aus of undertale + my oc and people's oc. If you do not know Undertale: It is a game developed by Tobyfox and his crew, cost about $10. Do support him by buying it. With cracks, you might have a hard time to find Gaster and the secret bosses. Sooo: Here's the story thing. You meet Gaster about 3 years later after the barrier broke, running from your deadly step-father. But you're still happy go lucky. Gaster in this point, had returned from the void he was trapped in. Introduced to the skele-family and other monsters (WITH SOME OCS LATER), funny things happened a lot. Basically, comedy romance. This is book 1: Artificial love of a Skeleton. In this book your romantic relationship will be with Gaster of course. (Gaster, in this story, is a relative to G!sans and G!Papyrus. NOT FATHER) Btw, this is a slooowwwww-burnnnnnn (takes time for y/n and Gaster to fall-in-love) Yes, you , y/n, will have complicated shit. Love is complicated, but it is easy if you trust one another and forgive one another. (Yes, another character falls in love with y/n. But since y/n's cruel, y/n friendzones everyone HAHAHAHAHAHAHA okay okay no. I mean, yeah. I give people false hopes. HAHAHAHAAHHAHAAHA Not to mention there's deaths and stuff.) Burnnn- I mean no. Anyways: There will be sad parts though, but you'll meet one OC that'll mess up the story plot and the scene. I think there's 2. Maybe 3 Idk, just count them if you want. If any of you got The Right answer i will do special chapter. (Collab with another author. Or take a request.) Let's put credits btw. Undertale belongs rightfully to Tobyfox and his crew. This spin off story belongs to me and my team. (My Sister and my friends, 2 of them. Which I'm gonna say who they are at the end of the book.) If you want to translate, go on. Post it on tumblr or idk hahahaha. But, do ask me if you want to.
Cryokinesis ╪ Sans X Reader by berrybitchringpop
berrybitchringpop
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"Blue", a old friend gave her that nick namename. Her real name is Y/n L/n .y/n has secrets that she MUST keep a secret. Her secret? Well... It wouldn't be a secret if I told you. (Originally Ice Cold) Highest ranks #1 in Sans X Reader #331 in Fanfiction
W. D. Gaster x Reader Oneshots (Requests Closed)  by PrussiaFlute
PrussiaFlute
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I am completely enamored with this character right now. Finally, someone I can unleash my 'dad' kink on~ They are most likely not going to be canon to his character at all, but I'll try to keep some things straight. But I am sticking to the theory that Sans and Papyrus are his kids. Hope y'all like em! :3 Cover art isn't mine!
Light in the Dark (Gaster X Reader) by SpiritWolfNura
SpiritWolfNura
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He went blind in a freak accident at the lab. Now all he 'sees' is darkness. Until.. he meets you.