Undertale
15 stories
For Your Sake (Gaster!Sans X Reader) by BanthaBug
BanthaBug
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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.
The War Amongst Us (W.D. Gaster X Reader) by TheIndianaCrew
TheIndianaCrew
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(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 use their artwork as the cover!
Forced Love (GasterSans x Frisk) by UnknownWaterTonari
UnknownWaterTonari
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Frisk and her parents own a large mansion in a city. When she turns 18 her parents decide that she's now old enough to get married. Her parents are protective but also quite strict, so they decide Frisk should get a organised marriage. Will it work out for Frisk? {All characters and art belongs to their rightful owners}
Can I take you to Dinner? Mafi-fell!Sans x Reader.  [COMPLETED] by MissHoll-E-Socks
MissHoll-E-Socks
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"How rude, not even gonna ask for a name??" He teased. "Why are you here?" You glowered, raising the whisk. The skeleton scoffed: "Well, glad you asked sweetums! Name's Sans, Sans the skeleton." - Y/N, a ritzy waitress at Grillby's is plucked from her world of pancakes and Orange juice into the gun-slinging, smoke-breathing lap of one of the most fearsome dons in the city. Escape from him- let alone the King's Service that now hunts her down? I don't think so. **SMUT WARNING TO ALL THE UNDERAGE POTATO PATCH CHILDREN!!** - TRANSLATIONS WELCOME, JUST ASK MY PERMISSION FIRST - #1 in: sansxreader. 10th of May.
Fallen Angel (Gaster x reader) OLD by Feniksiara
Feniksiara
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OLD AND BADLY WRITTEN THE REWRITE IS POSTED ALREADY DISCLAIMER: The god figure created in this fanfic is purely fictional. He is purposefully made to be prideful and cruel and is not supposed to represent any god. I am religious myself and I did not intend to attack anyones believes with this book. An angel. Sign of hope for humans, yet a nightmare for monsters. Powerful, skilled and...beautiful. But what happens when one rebels against the cruelty towards monsters? What happens when she's banished to the underground, only with wings as a painful reminder of who she once was. What if she's found by the Royal Scientist? What if the nightmare every monster is scared about, is just as broken as they are? And what if she'd find something she would never imagine she'd find in the underground...love? *Cover edited by me. The pictures used in the story belong to their original creators. If any of them aren't okay with them being used, I'll take them down* Started: 21.12.2018 Ended: 22.08.2021 09.03.2019-Number 1 in gaster! 07.02.2020- Number 7 in undertale! 25.02.2020- Number 4 in undertale! 15.04.2020- Number 1 in undertale! 11.10.2020- Number 1 in papyrus! 03.06.2021- Number 80 in fanfiction!
HP (W.D. Gaster x Reader) by Dunce_Reads
Dunce_Reads
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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 without showing mercy. But what you didn't expect was HIM. The monster that gave made you question your own methods. The monster that didn't treat you like a freak. The monster that gave you the only aspect you lacked.... HOPE.
Grillby x Reader: War Zone by KyraP_
KyraP_
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    Parts 11
The reader is a wizard, beings with the shape of humans but the magic of monsters. Wizards were forced into the war between humans and monsters by the humans. There, she meets the monster general, Grillby. Cover photo belongs to: http://ask-grillby.tumblr.com
Gaster x Reader- Not Your Fault by Singeroftales
Singeroftales
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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 appearance. Also artwork is not mine~
Prisoner of War (W.D. Gaster X Reader) by MelodyPlescher
MelodyPlescher
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    Parts 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
A fire to my soul {Grillby x reader} by QueenMonokuma11
QueenMonokuma11
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You had been living in sowdin for a while, you decided it was time to get a job if you planned on staying with sans and papyrus. You decided to work at the nearby bar and restaurant grillbys your boss the owner was well is a good friend of his so you got the job quite easily, no strings attached. Your first day was as easy as a baby crawling but soon you would realise your love for grillby.