Sir Pentious is a Victorian-era demon striving to be modern and cool and has a passion for building steampunk machines of destruction. His goal in the pilot was to conquer Hell using his machines and army of Egg Boiz. He is the second sinner the hotel is attempting to redeem.

Sir Pentious is bombastic, flamboyant, short-tempered, temperamental, and persistent, his personality appearing to take cues from classic "mustache-twirling" stock villains. He takes tremendous pride in his grandiose ideas of how evil and cunning he is. He uses his mechanical genius to build weapons, such as a cannon and his airship. However, he is more than capable of showing remorse and has a sense of honor. He strives to be modern and cool. Sir Pentious is oblivious to sexual innuendo and tends to take the things said to him very literally.