Underfell Papyrus is...FAR from as friendly as the original version. He is rude, cruel, and far stronger than the original Papyrus. He's also Fell Sans's boss, but despite being his boss, he cares deeply for his brother,

Fell Papyrus is also in a toxic romantic relationship with Fell Muffet, one that involves yelling, slurs, insults and even getting physical with violence. Even he has no idea why they remain a couple. He also retains his love of cooking spaghetti, and is very good at it.