1 - 20 of 509 Works in W. D. Gaster/Grillby
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The Goddess of the Sun, supportive of Humans.
The Goddess of the Moon, supportive of Monsters.
Two sisters in a battle between two species, two opposites against one another. What will happen when the Day tries to force itself over the Night?
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Gaster wants answers to his questions, regardless of the universe he’s in. (Even if he inadvertently caused those questions himself, intentionally or unintentionally…)
He’s been alone as long as he remembers and the only thing that could be a “clue” to his identity and hidden memories is a metal plate drilled into his right hand.
Or Gaster tries to find answers but everything goes worse for him.
Handplates! AU (reversal of roles)
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Grillby knew he still had much to remember, but he enjoyed their time together. Though an unspoken thought haunted him: What had happened before Gaster disappeared? Grillby never brought it up for fear of frightening his love. He was sure the memories would come in time.
In which Grillby begins to remember the sad memories.
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Gaster and Grillby used to hook up a lot, but the circumstances of their lives have made it difficult to maintain anything more than the most casual long-distance relationship, even that frequently falling on the backburner in recent years. Gaster's career fair speech at New Home High School presents an unexpected opportunity to re-kindle old passions.
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An outlaw stumbles onto a healer's porch, bloodied and wild. How do they fare with kindness reaching back out to them?
Series
- Part 1 of Under the Joshua Trees
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Welcome to the Underground, you’re in for a treat. Your day will be full of magic abound, dramatic thrills and spills. This is our season’s end and you know what that means: the champions bracket has reached the final match-ups. They fight for your glory, for your love, for your attention. Not all will make it. But that’s a part of the action, isn’t it? Place your bets, take your seats. We hope you enjoy these interesting match-ups we’ve planned.
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When Jane Ainsley finds herself trapped with monsters Underground, it's hard not to fall into old habits. The kindnesses of monster-kind make it easy to become complacent, when she had spent so long avoiding companionship. However, the ever-present pull of the Void keeps her moving forward, towards someone only she can SAVE. In helping Dr. W.D. Gaster find themselves once again, can Jane form her own sense of identity?
An isekai-adjacent story starting Underground and featuring an anomaly that is not our narrator.
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Grillby stood in the remains of an abandoned lab, in flickering dying lighting, flames banishing the shadows that creeped in around him. Clearly, no one had been in this particular part of the labs for some time.
Grillby wakes up one day suddenly remembering an entire past life- a soulmate and a family that no one knew. And he is going to get him back. No matter what it takes.
Gaster has almost settled down into this strange new life- trying to understand the Dark World around him and its strange cast of characters. -
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One overworked Royal Scientist and one small town diner owner cross paths. Sparks don't really fly, but they should at least settle somewhere, for the boys' sake!!!
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Festival of Stars rolls around once a year to celebrate the lives of those who have passed onto the sky
It’s a time of peace and healing and love
For most people
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Wingdings’ youngest, Bonnie Flora Gaster, is a very affectionate and giggly child. Since birth, they were deemed to be special, different, but sometimes, Bonnie wishes they were more than just those words, or the assumptions strangers make for them. Can’t they figure out for themself?
Series
- Part 4 of Triple G Universe
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My first ever "fic", kinda nervous. I noticed the lack of grillster stories which is lowkey sad cuz they are my favourite rarepair, so I have been summoned to make some I guess :D
English isn't my first language, so there will definetly be some spelling mistakes or bad english and or writing, so I want to apologize in advance and will accept any help or criticism so I could improve if I decide to keep writing :>
I do hope you enjoy reading this mess and i'll try to update regularly. Thank you lots <3 -
Celestale - Another Undertale AU by AstroAstrology
Fandoms: Undertale (Video Game), Underverse - Fandom, Celestale (Video Game)
11 May 2025
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• • 10 years after the cannon events of Undertale . The human child decides to take a new route , one that soon changes all perspectives on the human race..
• • Was Toriel really who she seemed? What happened to that royal scientist all those years ago? Where was sans’es father?
> THIS IS A SUB SWAP AU | Toriel rules while Asgore cares for the monsters.
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Gaster goes back on a promise he made to Grillby, so Grillby asks you to help punish him for it.
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An imagining of the story before, slightly during, and maybe after the war. Relations between humans and monsters are beginning to sour, and now Gaster must navigate life in his new, unfamiliar home. Unfortunately for him, himself and everything he knows could end up changed forever...
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Waking up in the body of a skeleton wasn't exactly what you were expecting. The last thing you remember was... the Only thing you remember was clear skies, a flash of burning pain, then... nothing. nothing about who you are, who you were. the two skeletons in front of you seem familiar, like a memory you can't quite reach. here's hoping you can figure out Something.
the first one falls.
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Universe Clash by SiberianSpirit
Fandoms: Undertale (Video Game), Deltarune (Video Game)
24 Mar 2025
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Welcome to the Universe Clash! A hot mess multiverse adventure, modified from roleplay to story format for your reading pleasure or displeasure. Inspired by Toby Fox's game "UnderTale".
Follow the paw prints of Sedge, Copper, and Mira on their quest for friendship and magic.
Follow the author, Syl, on her quest to become a better writer.
- Language:
- English
- Words:
- 4,838
- Chapters:
- 4/?
- Hits:
- 89
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Jealousy isn't a common feeling for Gaster, especially not with Grillby. But an old Ex-turned-friend brings up the feeling with a surprising force, and the two traverse this new obstacle together
Series
- Part 5 of Moments to Savor
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Gaster isn't always the best at taking care of himself, especially in the cold weather of Snowdin. It's a good thing someone is looking out for him.
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Grillby let out a sigh. Gaster had invited him, and Grillby knew just how much the skeleton disliked the royal galas. He would always get all tongue-tied around those rich patrons. The poor guy was just as scared as he was. Grillby straightened his back, Well, we can’t both be scared. He built up his resolve and grabbed his nicest dress shoes.
In which Grillby and Gaster go to a gala