Papyrus (/pəˈpaɪɹəs/, pa-PIE-rus), known as COOLSKELETON95 on UnderNet, is the younger brother of Sans, and a major character in Undertale. He wants to catch a human, so that he can become a member of the Royal Guard.
Papyrus is a loud and flamboyant skeleton who presents a confident, charismatic image of himself. He tends to work hard, and despite his brash personality, he is a very kind skeleton at heart. He is extremely optimistic and innocent, as shown on a Genocide Run when he continues to believe the protagonist is good at heart, even as the protagonist attacks and ultimately kills him.
Papyrus is occasionally rather oblivious and nonobservant, such as when he tries to rub different kinds of creams and "sauces" behind his ears, only to realize that he doesn't have any ears. He can be witty at times, especially when he used reverse psychology to trick Undyne into making friends with the protagonist.
For all of his skeleton faults, Papyrus seems to match this with how overwhelmingly determined he is, a feature that made Undyne take notice of him when he waited and begged her from midnight to morning for her to accept him into "royal guard training".
He really likes spaghetti and cooks it in his spare time, though many characters seem to think that he's really not very good at it (Frisk describing the taste as "indescribable"). Sans says that ever since he started taking lessons that his culinary talents have improved greatly, and that in a year, his food might even be "edible". He also has a love for puzzles, as shown in his dialogue and the numerous amount of puzzles he prepares whilst the protagonist approaches Snowdin Town.
*REMEMBER TO REALLY ROLL THAT "GREAT" word as shown in edited 1st line :) *