Like Sans, he tries to be cool and collect. He does seem to refrain from killing unless it is a Necessity, although that is more than his UnderTale counterpart (As classic Papyrus will not kill in any cases). He claims to try to toughen Sans up in the harsh world of Underfell. He does seem morally fine with treating others brutally, although he shows visible remorse when he does anything too far (Example: Torture, Manipulation, Fear-Mongering, Etc.) The only person he shows any sort of bond, even weak, with is his brother Sans, and the head of the Royal Guard, Undyne. He does seem to take threats very seriously, so he isn't insulted commonly in Public, the insults end up going towards Sans instead, as he is more controlled. He will also kill anyone who threatens him or Sans directly while being sober.

Papyrus is a Lethal And uncontrolled Royal Guard commander and he cares little about the well-being of other monsters, and will not hesitate to slaughter anyone just to set an example. He wears a red cape, a pointed black battle body with a golden symbol on the left, long red gloves, black trousers with a red/yellow wrestle mania belt (made after he beat Undyne) and red heels with 3 black stripes (Given by Alphys). He has a scar running from his right eye and sharp teeth (some FanArt shows him having glowing red pupils). Papyrus has semi-closed eyes and sharp teeth. He is about 3 inches taller, at 6' 4', with a good posture and bleached white bones. Fell Papyrus shares many physical similarities to his UnderTale counterpart.

Underfell papyrus fight sprite