1 - 20 of 156 Works in Royal Guard 01 (Undertale)
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The forests of Underfell are expansive. When the Fell brothers investigate in one of the worst blizzards of the Underground, they find something unexpected.
Series
- Part 1 of A Rogue What?!
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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
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Gather children, listen well, harken to the Under Tale.
A story of a small child, falling into a massive cavern where monsters have made their home. With the help of a certain phantom, the child makes their way through the Underground, making friends & family along the way.
I own absolutely nothing in this. Undertale, along with with characters, setting, etc., belong to its respective owners, who are not me.
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RG01 hits a quick stop by RG02's house to drop off a gift, but ends up baking gingerbread cookies and bringing them to the police station instead.
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Echoes of Another by MixmasterTheChemist
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
26 May 2025
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What was Clover’s journey like before Flowey tampered with the switch? Why was the main route so challenging for him? Clover will be forced to go through many trials and challenges as he tries to reach Asgore’s castle with the help of his new best friend, Flowey!
Series
- Part 1 of Undertale Yellow Bytes
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At college, Asriel sorts out his complicated feelings for Pizzapants.
Meanwhile, Pizzapants slowly spirals from Asriel's radio silence since he left for college.
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Drunk On Power (And Ketchup) by Cat_On_A_Keyboard, Chill_Phil
Fandoms: Undertale (Video Game)
17 May 2025
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Frisk has been trapped in the same loop for longer than they care to track. They can now consistently break the barrier or get to 20 LV without taking any damage. After getting to Snowdin (again), Frisk decides to try something different.
Proofreading by Chill_Phil
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Luck Is on Your Side by Dark_Xenon
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
12 May 2025
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The smallest of changes just before the epilogue can cause the entire ending to change.
A small attempt at comfort has had massive reprecussions... But it's unlikely anyone involved will complain about what happened.
Once they all learned that it happened that is.
Lost in an Underground that's painfully familiar yet completely unknown to them, with two different forces calling out to them, a monster with no memory of who they are or where they're from is forced to grapple with how they came to be.
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SANS, WHY DOES THIS FANFIC SAY YOU HAVE MULTIPLE RELATIONSHIPS? WOULDN'T THAT MAKE YOU A MORMON? by mmmMonkey
Fandoms: Undertale (Video Game), 呪術廻戦 | Jujutsu Kaisen (Manga), Chainsaw Man (Manga), Game of Thrones (TV)
17 Mar 2025
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not to be 'mormon'ic, but i think you mean 'polygamist', paps.
BROTHER, YOU KNOW THAT IS SPECIFIED FOR MARRIAGE, HENCE THE 'GAMIST'.
well, then, uhhhhhhhh, well, 'gamist', 'gamer', i guess i'm a player?
IMPOSSIBLE, YOU ARE AN NPC, JUST LIKE ME! NYEH HEH HEH!
Hey, guys, it's me, Gojo Sa-
GO BACK TO BEING DEAD, KIT KATORU!/unalive yourself, mr. fraudjo.
author's note: i plead the 5th for what i was doing, eating, drinking, and taking while making this fanfic.
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Just One ANOTHER LEVEL by Nurrenbri
Fandoms: Pizza Tower (Video Game), Undertale (Video Game)
04 Mar 2025
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In his mad race, Peppino Spaghetti gets to another strange level...
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The Nice Cream Guy opens his own shop on the Surface. Today is a lovely Tuesday morning.
- Language:
- English
- Words:
- 2,823
- Chapters:
- 1/1
- Kudos:
- 2
- Hits:
- 35
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Pirates Of The Undertale by Cat_On_A_Keyboard
Fandoms: Undertale (Video Game), Pirates of the Caribbean (Movies)
16 Feb 2025
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Pirates of the Caribbean reimagined as Undertale characters. Currently in development, this is a rough write up of character substitutions and plot ideas. Looking for co-writers/proofreaders if anyone is interested in helping.
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This is the rewritten version of this story!
Enjoy reading
[This will not update very often] -
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The events after the entire human incident, the two royal guards find themselves in the same problem but with only just the two of them now. An expansion of the sexual tension between them finally resolved after so long of yearning.
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01 is inconsolable but 267 somehow manages. Canon typical abuse and injuries, canon typical Sasha masking all their other emotions with anger (poorly).
- Language:
- English
- Words:
- 1,570
- Chapters:
- 1/1
- Kudos:
- 4
- Hits:
- 31
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After the events of Undertale Yellow Clover survives and goes into hiding. 20 years later not only had he found a family that cared for him, he found love with his best friend Martlet. Soon the people of the Underground notice that humans have stopped falling into the Underground causing them to become desperate. Now Clover and Martlet must keep themselves and their son Callum hidden from Asgore to prevent their family from being torn apart.
Series
- Part 2 of Tales of a Hybrid
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Royal Guards 01 and 02 living together on the Surface, and there's much to do when it comes to adjusting to their new life.
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The Royal Pleasure by Anonymous
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
07 Dec 2024
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"My majesty, the human has been sighted near the Core, it's getting close! It might reach here any minute now, What should we do!?"
Earlier this day, a human's been sighted in the Lower regions of Snowdin, the royal guard had said. He has been cruel, merciless. Taking away every life that dared stand in his way. Nothing but dust lingering in the towns he has left behind.
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"Fuck, Sans... If you had killed this human the day you found her, we wouldn't be here..." Undyne whispered to him, filled with remorse and guilt.
She passed his hands behind his back, anti-magic handcuffs surrounding them. Checking their placing, she locked them.
Sans could not tell if she was hating him. Perhaps she was blaming herself, too. Perhaps everyone was feeling a little responsible. At least, he hoped so."Why did you do that?" she sighed, rhetorically.
"I did it out of love." Sans simply replied.
"That’s the stupidest excuse you could have chosen..."
•| ⊱❦⊰ |•
Corrupted by the Lust, monsters live a hell everyday, sex and immorality being a daily routine.
Sans is one of the most luxurious of them and then, the one who had always been the most disgusted by all of that. He lost hope. He lost will.One day, while going to this giant purple door, he found a package. A human baby. And strangely, Sans felt... at peace.
Now, Sans has something to protect from this world. And he is not going to give up, even when everyone seems to be against him. But it might be easier than he thought: it seems that this little girl can change hearts...
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It had been ten years since Undyne had first seen the sun, and it wasn’t enough anymore.
And now her people, the same people who Undyne had trained her whole life to protect, were on the brink of tearing each other apart in their desperation to be free.
What she wouldn’t give to get her hands on a human.