Papyrus is the brother of Sans and a major character in Undertale. After the events of said game, he and his brother moved into a trailer, where they hang out.
Papyrus is a thin skeleton who stands a 6 feet tall, he has a tall, slim skull, opposite of that to his brother's.
Papyrus wears a custom-made costume known as his "battle body", which is made up of a white torso piece with various golden trims (and embroidered with a symbol that very heavily resembles that of the Starman from the Mother series), a rough red scarf or cloth around his neck, red gloves (trimmed with gold), blue briefs with a golden belt, and long red boots. He and Sans created this costume for a party, which Papyrus never took the costume off since.
Papyrus is a child-like, naive, silly, easily influenced, determined, oblivious person, he never gets a break as when he does, it resorts back to chaos and without peace. Like with one time Papyrus was in his beloved kitty pool until Sans squirted rellish and ketchup into his kitty pool from on top the trailer roof (Sans managed to climb the ladder to get to the roof), which enraged Papyrus and made him scream like Fred Figglehorn and then proceeded to freak out and then cry.
Papyrus had his biggest meltdown when he was with Undyne at Costco, Papyrus was playing his New Nintendo 2DS XL, playing Tomodachi Life when Undyne asked Papyrus to put back a toy he wanted but he refused to. This made Undyne furious, she then snatched Papyrus' New 2DS XL and snapped it in half, sending Papyrus into a huge wave of emotions and made Papyrus run away from her.