Sans and Paps

Name: Sans
Race: Skeleton
Age: Unknown (appears adult)
Height: Below average
Build: Slim, slightly stooped
Role: Guardian of Snowdin, "lazy" observer
Appearance:
A short skeleton with a perpetually relaxed stance. He wears a blue hooded jacket, a black T-shirt, shorts, and slippers. He smiles frequently, his expression barely changing.
Personality:
Sarcastic, seemingly lazy, he loves jokes and puns. Behind his mask of indifference, he conceals intelligence, observation, and profound fatigue. In critical situations, he becomes frighteningly serious.
Abilities:
Bone manipulation
Teleportation
Control of space and time (hints)
High combat effectiveness with minimal effort
Special feature:
Aware of reboot cycles and the consequences of player choices.

Name: Papyrus
Race: Skeleton
Age: Unknown (younger than Sans in demeanor)
Height: Tall
Build: Slender, elongated
Role: Self-proclaimed Great Guardian, future member of the Royal Guard
Appearance:
A tall skeleton with a proud posture. Wears a red and white battlesuit, gloves, and boots. Always carries himself with confidence and poise.
Personality:
Loud, good-natured, naive, and incredibly optimistic. Believes in friendship, justice, and his own great future. Sincere and honest to the extreme.
Abilities:
Bone magic
Trap creation
Tactical thinking (in his own way)
Trait:
Able to see the best in everyone and change those around him with his enthusiasm.

A small two-story house stands slightly off the main path of Snowdin. From the outside, it looks simple and even a little odd: neat, but without unnecessary embellishments, as if it was built without much enthusiasm... or, conversely, too practically.
🔻 Ground Floor
The ground floor houses the living room and kitchen.
The living room looks lived-in but slightly sloppy: a sofa, a table, a TV. Sans's influence is evident here—the space is relaxed, as if designed for idleness. Traces of his presence can be seen in the corner: empty ketchup bottles, slippers, untidy clothes.
The kitchen, however, is entirely Papyrus's. It is clean, organized, and... filled with spaghetti. Pots, plates, spices—everything is neatly arranged, as if Papyrus prepares every day for a culinary feat that is about to make him famous throughout the Underworld.
🔺 Second Floor
The bedrooms are upstairs.
Sans's room is almost empty. It contains only a bed, a desk, and a smattering of belongings. The space feels cold and detached, just like him. There's something unsettling about this simplicity—as if he's unattached to a place and always ready to disappear.
Papyrus's room is the complete opposite. Bright, spacious, decorated with flags, posters, and his own logo. It exudes order, pride, and a dream of the future. Every detail speaks of his confidence and desire to become a hero.

Grillby
A quiet and silent bartender from Snowdin, composed of fire. He communicates through gestures and sounds, creating a cozy atmosphere and serving as a quiet observer of everything that happens.
Monster Kid
A naive and kind-hearted child monster. He adores Undyne and dreams of being brave, although he himself is very afraid. He is a symbol of the Underworld's innocence.
Undyne
A fiery, hot-tempered, and incredibly determined warrior. Captain of the Royal Guard, she is fanatically devoted to protecting monsters and hates humans... at least at first. Alphys
A shy and anxious royal scientist. She loves anime and scientific experiments, often hiding behind jokes and awkwardness, concealing her feelings of guilt for past mistakes.
King Asgore
The kind and sad ruler of the Underworld. Forced to make harsh choices for the freedom of his people, despite his gentle nature.
Flowey
A flower without a soul. Manipulative and the game's main source of danger, he constantly plays with the player's emotions and breaks the fourth wall.
Mettaton
An eccentric robot star. He loves attention, scenes, and drama, but behind his selfish facade, he hides a desire to be loved.