So, papyrus. The best undertale character. Sadly, he is represented TERRIBLY by the comunnity. I'll be listing diffrences between cannon paps and fannon paps.

Cannon: Papyrus is pretty strong, having a great hold on his magic and being able to change his attack damage so frisk doesn't die.

Fannon: Papyrus is a weak and can't throw out one strong attack.

Cannon: Papyrus makes more puns in undertale then sans does, and is only frustrated with sans's puns cause they are low effort and it adds onto his laziness.

Fannon: Papyrus DESPISES puns so much and will never make one.

Cannon: Papyrus is very smart. Having a great mind of making puzzles and being cunning and manipluative, like how he uses reverse phsychology so frisk and undyne become friends.

Fannon: Papyrus is an idiot who doesn't know what death is and makes shit puzzles.

Cannon: Papyrus's favorite food is not spaghetti. He just loves making it.

Fannon: Papyrus is obsessed with spaghetti.

I could go on more, but it would take forever. Just note that papyrus is treated like shit, and for most people he only exists for him to die so sans can be mad and try to kill you. Hope this clears that up, have a nice day!