1 - 20 of 310 Works in Younger Brother Papyrus (Undertale)
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A FINE LINE BETWEEN ORANGE AND YELLOW by Fantasy_Artist
Fandoms: Undertale (Video Game), Original Work
09 Oct 2025
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While Aneira didn't necessarily believe monsters existed, she did find the fact that everyone and their dog still did might mean something. Her childhood town of Beddgelert believed in monsters trapped under the mountains near their home that would need a seventh soul now to break out and destroy lands.
Aneira also knew that she needed to figure out what happened to the kid she was friends with who went missing. Which was how she found herself having fallen (probably) hundreds of meters below a mountain inside a cave system. Was she stupid for leaving without telling people where she was going, definitely, but, to be fair, she didn't expect to fall; she couldn't even see the hole.
Injured and wanting to go home, Aneira braves through the underground cave systems, finding MONSTERS both friendly and foes, learning about what happened to all the previous (children) HUMANS that fell.
tldr: Aneira falls instead of Frisk, is injured and is too stubborn not to use this chance to find out what happened to a friend (definitely dead by now, but she still wants to confirm), the Undertale cast feels like something is different, but not what. They also live in Wales here because why not?
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Hiiii guys 😗🥲 it's been so long ya'll oh my gosh 😭😭😭
"
Getting a job at an aquarium was not something Gustav ever thought he'd be getting into.
He went to college, he studied culinary, he was great. But, y'know. Shit happens. Plans fall through. And you take chances.
So! When he stepped foot into that private area, he assumed it was some rare fish- although, while technically yes they are rare fish. Eeeeeh, he doesn't think.... that really counts.
Mermen.
Jesus christ what fucking dream has refused to loosen its grip on him.
"
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The Void Is Calling, It Wants Wingdingus Back by marcoandtheskeletoncargo
Fandoms: Undertale (Video Game)
08 Oct 2025
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Parenthood carries great responsibility. As do the choices you make during a mental breakdown.
Gaster must ACT before its too late, otherwise a grave decision will be made for him.Series
- Part 3 of random angst
- Language:
- English
- Words:
- 680
- Chapters:
- 1/1
- Hits:
- 10
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In an experimental run, Flowey was worried Toriel would convince a fallen human to stay with her in the Ruins. Flowey was struggling to find a way to prevent this.
Luckily, a very “agreeable” skeleton friend of his might be able to convince her, but they’d need to target her kind nature somehow.
Or
Papyrus suddenly disappears. He’s in the Ruins with Toriel (due to unfortunate circumstances), but his other friends don’t know that.
Takes place pre-pacifist route!
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Papyrus returns from training late one evening, and decides to ask Sans if he wants anything.
Sans is not there.
Papyrus shrugged it off, knowing Sans was probably at Grillby's, eating that disgusting, greasy food again. He was probably safe, drinking ketchup, telling puns and stories...
But Papyrus had a grim feeling that was not the case.
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No update schedule for this what-so-ever, sorry!! I'll try to write as fast as I can, but don't expect it to be too often.
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I’m safe here (I’ll wait for a brighter day) by Ultimate_Sugar
Fandoms: Undertale (Video Game)
01 Oct 2025
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Gaster introduces his littlest son to a brand new game they can play, just the two of them.
This can only go well, of course.
(formally named 'soap')
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He was a bad brother. He knew that. He didn’t need all of this shit to happen for him to acknowledge that.
...Whatever it is that’s happening at this point.
Or
Papyrus made a stupid mistake and now sans is gone.
Series
- Part 1 of MeryFell
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Long ago, two races ruled over Earth: Humans and Monsters. Religion and fear of differences troubled the fragile peace on which both species were living so far. A war for faith and honor soon engaged between them. Long. Endless.
Sans and Papyrus, two young skeletons brothers, sons of the Royal Scientist, lost everything in the rage of the fighting: their home, their family, their childhood. During a human attack, they suddenly found themselves delivered to bullets and bombs, all alone.
Both of them started a journey in the devastated landscapes of the end of the war to join Mont Ebott, where Monsters are preparing for a last battle. But could two kids survive by themselves in the wild and without any help?
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Papyrus attends college and you are his Human Tutor by Spectascopes
Fandoms: Undertale (Video Game)
22 Sep 2025
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Papyrus, now a surface-dweller, decides he's going to go to college to meet human college students and become wildly popular. Being the first monster student at a human post-secondary school inevitably comes with a unique set of social challenges, but Papyrus is nothing if not capable! With the help of a new human tutor and his family cheering him on, he will acquire every degree possible and then some.
You are a part-time student who gets asked to help out the new skeleton monster you've heard screaming in the halls, and you couldn't say 'yes' fast enough.
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Someone Really Cares About You. by Meowzerz_Oh_6
Fandoms: Undertale (Video Game), Deltarune (Video Game)
17 Sep 2025
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Sans Undertale struggles to adapt and move on while integrating on the surface.
The troubles of his past haunt him, the burden of his old home, coming from a different world, being aware of resets, the trauma is all messing with his head.
He’s already fallen into depression and other darker thoughts.
Will he succumb into hopelessness, or will he realize that people care about him in time?
OR
What if Sans Undertale is actually from Deltarune? What will a man with such knowledge and burdens do? Will he stay determined? Or will he succumb into the despair that the universe threw one thing after another at him, as he tries to move on in a permanent happy ending.
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Working at a bar wasn’t all that bad. Sure, sketchy people would show up, and sure, there have been some fights, but besides that, it wasn’t that hard for her to focus on her job. Of course, the only person who made Muffet’s shift bearable was Fell, who had become a regular.
This is an image roleplay format & podfic loosely inspired by Sooner or Later You're Gonna be Mine by Staringback ( A03).
So if you are a Frans shipper, I'm sorry, but adult Frisk will not be in roleplay. Muffet will be taking her place as Sans' love interest... DunkinDonut.
Please enjoy.
- Language:
- English
- Words:
- 10
- Chapters:
- 2/?
- Hits:
- 161
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A new life begins for you and your little sister, Neelam. That new neighbourhood is the chance you need to erase the past mistakes and those terrifying fifteen years you passed in a foster family.
You are not the only one who’s running away from the past. Your neighbour, Sans, affected by a strange illness that’s causing him memory loss, is worrying you. At nightime, he’s wandering in the streets, lost, like he is chasing after old demons. His brother, Papyrus, can’t look after him for the moment. Since you are in desperate need of a job, he’s asking you to do that for him.
You know it is not an easy job, but how complicated can that be when Sans is all but cooperative? -
The Shadow in the Knight’s Hand by Metal_Overlord93
Fandoms: Undertale (Video Game), Deltarune (Video Game)
07 Sep 2025
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In the quiet town of Hometown, everything seems peaceful… or so it appears.
Kris Dreemurr, a lonely teenager haunted by a past tragedy, struggles to find their place. With their brother, Asriel away at college and their best friend Noelle growing distant, Kris feels more isolated than ever. But along the way, they form new friendships, and slowly begin to reconnect with Noelle.
Meanwhile, whispers spread of a mysterious figure appearing around town, a cat-like shape with haunting pink and yellow eyes. Some say it appeared after the disappearance of December “Dess” Holiday.
Now, with strange “Dark Fountains” opening across the land, Kris and their friends must uncover the truth behind Dess’s vanishing and confront the darkness threatening to consume their world.
Series
- Part 1 of UT/DR stuff
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I like the head cannon of Sans having raised Papyrus. I also like the head cannon that all other skeletons died when the Barrier went up. So we all know PTA Sans, the punning and protective skeleton who join the PTA for Frisk. The thing is, in what I've seen, he acts experienced.So I like to think that he did the PTA before, for Papyrus. He had to make skeleton needs and growth and customs known to monsters who had never even seen a skeleton before. And we know how much Sans loves his brother, so he was probably very dedicated. Maybe he transferred some of that dedication to the human PTA.
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The story of the human and monster war, now days just another bedtime story, but that is for the humans. Monsters live trapped underground, they have gone through famines, epidemics, lost of hopes and dreams, and all because the humans were scared of them. Hope came back when finally, a "human" fell down. But it just brought more misfortune.
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In Which You Become a Multi-Dimensional Pen Pal With Yourself by Idontevenknowwhatthisis
Fandoms: Undertale (Video Game)
26 Aug 2025
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"Resets", which you only actually learned about this morning, were a freaky time phenomenon which allowed something to travel to the past repeatedly. That "something" was a human, and that human wasn't actually human at all. That was what your journal explained to you.
(Or, Sans doesn't remember the resets, but he knows about them and he has to deal with it.)
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Papyrus believes in everyone.
...
The word "everyone" doesn't include himself, it seems.
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The nightmare gets into Au without its powers. Even the author doesn't know what will happen.
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Sans turned to Papyrus. "you..sure you want to do this Pap? We can always send them with Undyne and Alphys-"
"YES, OF COURSE! FRISK IS MY FRIEND AND WILL NEED TO BE LOOKED AFTER IN THEIR SICKLY CONDITION. I AM THEIR BIG BROTHER AFTER ALL, IT'S MY DUTY TO PROTECT!" Papyrus frowns as Sans glances away. "YOU..DONT THINK I CAN DO IT?"
Sans' eye sockets widened. "no that's not it, bro. It's just..."
"Just..what?"
OR
Papyrus wants to prove he can be a good big brother to Frisk! How hard can it be to take care of a 5 year old human?
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A strange infection has broken out across the Underground.
Echo flowers have become strangely hostile and aggressive, attacking and infecting monsters and taking over their bodies.
Most of the Underground has become completely overgrown by these dangerous plants, and only a few safe zones remain.
Sans, the Royal Scientist, must figure out a cure with the help of his assistant Alphys, before everyone he loves becomes infected by the echo flowers.
When a human falls into the Underground, Sans must figure out if they're the key to saving everyone, or the harbinger of doom for his friends and family.