Papyrus is a skeleton Monster, the son of Gaster, and the younger brother of Sans. He first made an appearance through a flashback in Megalomaniac, and then an official appearance in Continue.
Apperance
Papyrus is a relatively taller and slightly slimmer skeleton than his older brother, Sans. He wears a red scarf, a chest plate with a yellow trim and golden symbol on the left side, and grey clothing covering his arms, hips, and legs. He also has red gloves and blue briefs, both with a yellow trim. Lastly, he wears red boots with black stripes.
Ever since Game Over, he's seen in a much more casual outfit due to his "battle body" being broken. He is seen wearing a brown shirt, but still has his signature scarf.