1 - 20 of 4,474 Works in Grillby (Undertale)
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She fell chasing her sister. Now, disguised as a monster, she’s gambling everything to get Frisk out alive—including trusting a lazy skeleton who sees through her lies. With Asgore’s knights closing in and the king needing one last human soul, survival demands shortcuts through glowing caves and MTT Resort glitter. But Sans’s bone-dry wit and hidden power blur the line between using him… and losing her heart underground.
Neutral Route | Slowburn Sans/Reader | Found Family | Protective Siblings | 2016 Undertale fic vibes
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After almost eighty-nine genocidal routes and forty-six pacifist routes.
Frisk, wanting to mature a little and wanting to save the monsters after playing so much with the resets, decided to start a new pacifist route. At the beginning everything went as it should and there was nothing strange, but...
Why does Papyrus sometimes look at him with terror?! Why do they all have scars on their bodies?! Where are the human souls and where did they go?!
Frisk was very confused and didn't know what to do, he tried to do a reset, and in the new route... nothing changed and everyone still had scars.
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Life On the Surface by RetroWrites
Fandoms: Undertale (Video Game), Deltarune (Video Game)
24 Jun 2025
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Frisk has freed the monsters.
Now all they need to do is to live on the surface.
Campy story with plot and sad stuff on top of regular Undertale shenanigans.
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The first story of the series. Follows our protagonist through his rebirth and until he (re)enters the Multiverse.
In case you couldn't tell I suck at summaries, I'll get better eventually, probably.The Major Character Death Warning is temporary and happens multiple times btw, it is a little confusing at first but you will understand as the story continues.
Prologue: Rootverse's Collapse (1)
Arc 1: Rebirth (2-7)
Arc 2: Meeting Familiar Faces (8-?)
Sub Arc 2.1: The Teeth Incident (20-41)
Sub Arc 2.2: The Magic Incident (42-50)
Sub Arc 2.3: Time For Shopping (51-59)
Intermission: 1st Major Time Skip (60-?)
Sub Arc 2.4: ???Series
- Part 1 of Miseries of Metempsychosis
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Love. An emotion that carries a lot of weight and impact behind it. An emotion that can create beautiful memories and destroy the happiness of others. An emotion that can be tool to create and a weapon to destroy. But what happens when one human and three monsters get involved with such a powerful emotion. Following a big mistake in the Dark World, the four are about to get a damn good idea of what love can do to an individual.
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What can you do when an immortal mage appears in the Underground after countless resets? You help her in her search for a happy ending.
And I promise you, everyone will have a happy ending, even against their will.
Series
- Part 2 of For the departed
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What does a family look like when you’re trying not to go extinct? How do you judge the sins of the father, when the son insists no harm was done? What do you do when your youngest child is unhappy in his marriage, but you don’t want to cross the same line that nearly cost you your eldest? Gaster struggles to balance the societal norms of good parenting against his skeleton instincts.
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When you got a job at the only place that would hire you so you could keep your shitty apartment, you hadn't expected to get close to the regulars there. Or falling for the flirty skeleton always hanging around your friend group.
Series
- Part 3 of Sans/Reader Fics
- Part 4 of Undertales Across the Multiverse
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The arrival of monsters from Mt. Ebott threw society into disarray. Not only was a previously unknown species discovered, but the shattering of the barrier released centuries of magic back into the world. As society struggles to move forward from their bad history with monsters, MOPA, “The Monster Obligated Placement Act” was formed. As such, all mages must provide housing for a minimum of one year for a MOPA designated monster family.
Having jumped through enough hurdles to kill a horse, you are finally forced to house a family of your own.
Between eight skeletons of varying color schemes, your reluctant past, forgotten dreams, and a desire to make up for your sins, you are forced to use your wits in a world breaking at the seams.
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A fanfiction set after the Pacifist route. The characters you love are here : growing, evolving, finding their place on the surface. But with change comes the unexpected. And nothing will unfold quite the way you imagine.
New faces will appear too, including a young human woman who gradually becomes part of the group, discovering them, and herself, through fresh eyes.
This is an immersive story. Unpredictable. Sometimes funny, sometimes emotional, sometimes unsettling. Chapters will shift in tone and length, often illustrated, and with interactive moments where YOU get to decide what happens next. Just like in the game, you’ll have power. Or at least the illusion of it.
Forget what you know. Forget what you’ve read. Set your expectations aside and take the plunge.
- Language:
- English
- Words:
- 7,271
- Chapters:
- 3/?
- Hits:
- 17
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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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Escape isnt always easy and freedom isnt what its cracked up to be.
Series
- Part 2 of Ebbot Mountain Zoo Chronicals
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It's rumored that the monsters living on the other side of the city grew feral in their isolation underground... But none of that seems true to you, so you decide to visit Downtown anyway. Unfortunately, just like with humans, a few dangerous groups do exist, and your encounter with one lands you in the care of Dr. W.D. Gaster. To avoid political issues, you're secretly kept in his care for your entire recovery process, during which some interesting things come to light. For one, your doctor is a huge nerd, just like you are. More concerning, though, is the development of his thirst for your blood...
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Calcination Syndrome by Fells_Kitten (SquirrleyCow)
Fandoms: Undertale (Video Game), Underfell - Fandom
21 Jun 2025
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Calcination: The process of heating a substance just below melting point to induce change in physical and chemical properties, to remove impurities and ensure specific reactions and outcomes...
Grillby has a perfectly normal attraction to his long-time friend and nightly regular at his bar, Sans. He's been dying for a chance to act on that attraction but keeps backing-out before he can follow-through. After patiently biding his time for the perfect moment he finally makes his move.
Sans is contently unattached to anyone romantically. He has his friends, he has his brother, he has the bar and Grillby's usually quiet but comforting company. What more could he need? He hasn't considered a life outside of living with his brother and the occasional random hook-up to blow off steam. Sure, he's noticed Grillby, he's not blind after all. But from the outside looking in, it's always felt like Grillby was just as happy being single as Sans is. Being a single dad, even with a grown kid, probably changes your standards for a partner anyway. Well, until Grillby kidnaps him that is.
Waking up chained to a bed kind of changes your perception of a guy.
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Imagine if the person who fell to the UNDERGROUND wasn't Frisk? What if it were someone completely different, someone in control of not only their choices, but their powers as well? Meet Grace, a young adult who just happened to be walking through the woods the same day Frisk decided to fall. Grace managed to SAVE Frisk from their usual fate, but only in exchange for hers; Grace falls down into the UNDERGROUND. As she makes friends and walks through the UNDERGROUND, read to see how a different character might have made her decisions on the same path an innocent child took - and how she might ruin it.
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Unexpected Hero by LemonCake64
Fandoms: Undertale (Video Game), The Legend of Zelda & Related Fandoms, The Legend of Zelda: Twilight Princess
20 Jun 2025
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“Not so fun being stuck in some loop right? Trying to fight to protect what ya got, not getting a choice in it. If I had the choice I wouldn't remember either.” The words oddly felt comforting. Link let out a slow breath, closing his eyes for a brief moment.
He didn't feel alone for the first time in a long time.
And that?
That was terrifying.
“To be honest, I kinda gave up a while ago. Just sat back and let the chaos go on, felt like nothing I did mattered anymore. Everything would just be reset anyways. Stopped caring what happened, that was until you showed up.” The skeleton’s eyes bore back into the Hylian.
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The dichotomy between black and white is your constant when it's time for you to meet the whole new civilization Frisk brought along with them to the Surface.
As a parent, it's not easy to trust others when they've hurt your child.
So when that new civilization decides they owe Frisk both for saving their kind and for still hurting them during that process, you've got plenty to say to them.
Forgive as easily as you once did with others during a stage of naivety? Oh, hell no.
They better have a good reason for hurting your child and an even better one for wanting to be a part of their family.
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Full Arc List:
Arc 1 | Ruins
Chapters 1 to 15 (✓ complete)
Arc 2 | Enemy Approaching
Chapters 16 to 25 (× current)
Arc 3 | Pathetic House
Chapters 26 to 30
Arc 4 | Spear of Justice
Chapters 31 to 40
Arc 5 | Here We Are
Chapters 41 to 50
Arc 5.5 | Good Night
Chapters 51 to 55
• • •
(Important Notice: If this work seems familiar, it was originally published in 2020, but was deleted due to various health issues!)
(OLD WRITING LASTS UNTIL CHAPTER 25.)
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Lyra, a devoted Undertale fan, decides to play god by rewriting the game's code to grant Asriel Dreemurr the happy ending he deserves. But when her actions pull her into the Underground itself, she finds herself trapped in the very world she tried to control.
!!!!This story contains graphic descriptions of violence, body horror, and themes of grief, trauma, suicide, and manipulation aaaand a lot more. While it may seem fluffy at first, darker themes emerge as the story progresses. There are still plenty of warm, comforting moments, but I don’t want to mislead anyone expecting a purely lighthearted tale!!!!
Also, this is very slowburn — Chara’s and the MC’s relationship progresses slower than you might expect. If you find yourself feeling frustrated with how I write Chara early on, please know it’s intentional and part of the slow build. Thanks for giving it a chance! <3
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Once Upon A Time: an Undertale novelization by UndertaleGuy
Fandoms: Undertale (Video Game)
20 Jun 2025
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Long ago, two monsters ruled over earth: Humans, and Monsters.
An Undertale novelization, aimed to be as Canon compliant as possible.
For my Girlfriend <3
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After being fired from her job as a governess, Reader is about to be evicted from her house in the city. Luckily, she gets a job, but it's in a small town known as Hope's Bank. Needing a job, she takes it, now she's the sheriff for the town, but it isn't easy with three different outlaw gangs and two troublemakers in town who help her. Will she survive this new job of hers, or will the Wild West claim her life and soul?