Chapter 1: Puns

Meet Kopi. They're a paper thin human-like monster who hears the voices of six dead children. They also like jazz and is single.

In Snowdin, Kopi and Frisk were visiting the skeleton bros, and the former had volunteered for taste testing Papyrus' latest culinary creation. Apparently the stars had aligned for Kopi in that they actually liked the older brothers pasta.

"I'M TELLING YOU KOPI, THIS WILL BE MY GREATEST CREATION YET!" Papyrus boasted. "I MEAN, NICE CREAM AND PEPPORONI PASTA? WHY DIDN'T I THINK OF IT BEFORE!?"

"You're the chef, not me." Kopi shrugged. "As long as it tastes good, I'm not complaining."

"I ASSURE YOU KOPI, YOUR TASTEBUDS WILL BE BLOWN AWAY BY MY ARTISAN!" The skeleton declared.

"hey bro. hey flatstack." Sans spoke as he practically waddled in.

"Don't call me that." Kopi said.

"WHY HELLO SANS! DINNER WILL BE A BIT LATER TODAY, AS I AM HAVING KOPI TASTE-TEST MY LATEST INGENIUS IDEA FOR PASTA." Papyrus told him.

"that so?" Sans grinned. "just be careful you don't get flat."

Both Papyrus and Kopi froze. "SANS, DID YOU JUST..."

"oh, wait. it's not a problem. you're just like us. you can't get any meat on your bones." Sans chuckled.

"Nothing but disgust courses through my probably veins right now." Kopi hissed.

"it's cool guys, i'll just...pasta time 'till dinner." he snorted.

"GET OUT OF MY KITCHEN!" Papyrus raged as Kopi just screamed in a defensive manner.

"Why..." Kopi could only groan.

"IT WAS BAD ENOUGH WHEN HE JUST TORTURED ME WITH HIS PUNS. NOW HE IS AFFECTING MY FRIENDS TOO!" Papyrus lamented. "I DO NOT UNDERSTAND HOW THE HUMAN CAN ENJOY THEM."

"A mystery that will forever elude me." Kopi stated, before folding their arms. "The problem is he doesn't react to anything that we do to get him to stop."

"ADMITTEDLY I DID TRY TO THROW HIM DOWN THE STAIRS ONE TIME...BUT HE IS SURPRISINGLY PERSISTENT AT STAYING LATCHED TO WHATEVER HE IS SLEEPING ON." Papyrus said.

Then, Kopi seemed to have a spark of realisation, and grinned. "I have a plan."

"REALLY!?" Papyrus asked hopefully.

"We have one weapon over him that never fails." They giggled.

Later, at dinner, Kopi, Frisk and Sans were seated at the table as Papyrus brought bowls in.

"DINNER IS SERVED." Papyrus proclaimed.

"I helped, so its edible for you guys." Kopi added.

"HM? BUT, FOOD IS ALWAYS EDIBLE..." Papyrus pondered Kopi's coded message to no avail.

"looks good guys." Sans nodded. "this is just what i need after working myself down to the bone."

"THAT PUN WAS MADE EVEN WORSE BY THE FACT YOU DID ABSOLUTELY NOTHING TODAY..." Papyrus groaned.

But Kopi just chuckled. "Sans, we're prepared for your puns this time...we have a secret weapon."

"...is that so?" Sans grinned wider. "this oughta be good..."

"Yes...for we're gonna give you the ultimate look..." A glint flashed in their eyes. "A look...of DISAPPOINTMENT!"

"what?" Sans stared as the two of them gave him their most disappointed look. "...oh...no..."

"KOPI! I BELIEVE IT IS WORKING!" Papyrus declared.

"Keep it up Papyrus! He's gonna break!" Kopi encouraged.

"hehehe...a very clever tactic, flatstack. but...i have a countermeasure." Sans said.

"You're bluffing!" Kopi challenged.

"oh, i'm very serious. can you keep up your disappointed looks when you look at...this!?" Sans held up a bewildered Frisk.

"Gaaaaaaaaah!" "GAAAAAAAAAAAAAH!" Both of them cried as they looked away.

"I can't! I can't look at Frisk with disappointment! They're too pure!" Kopi wept. "That's playing dirty, Sans!"

"hey, all's fair in puns and war." Sans shrugged.

"ARRRRRRRRRRRRRRRRGGGGGGGGGGGGHHHHHHHHHHHHHH!" Both of them screamed in dismay.

Thank you for reading! Suggest other scenarios for Kopi, Frisk and other Undertale characters in the comments, and you can check out Kopi's adventure in 'Alternatale'!