Lord Diavolo

Despite being one of the most powerful demons in the Devildom as well as the Future King, Diavolo takes on a surprisingly fair and compassionate, if not joyous, attitude at almost all times. However, that is not to say he is a soft or lenient ruler, as even without the threat of retribution from Lucifer, all demons appear respectfully intimidated by him. Diavolo proves to have much more wisdom than his cheerful demeanor suggests. He shows moments of solemn clarity in which he correctly predicts events that will occur in the future either due to his subtle encouragement or his intentional lack of intervention. He has the ability to tell if someone is telling the truth and has made a rule for himself to never tell a lie. The goals that Diavolo sets for himself, his fellow demons, and the three worlds at large, appear to be pursued with the utmost best intentions. This is evidenced by the fact that so far he has only ever done what he believes is best, with the desire to improve the lives of those he rules over, even if the process is painful. Sometimes Diavolo may take statements literally. An example of this occurs in the chat A Task Meant for Levi when Leviathan says that he would "kill" for a new piece of technology to mess with. Diavolo shows great concern for Leviathan's mental state and Leviathan has to clarify that he is not actually having violent urges.

In demon form, Diavolo's hair becomes a brighter red and his complexion turns brown. His horns grow horizontally and curl inward, the ends decorated with gold. He has four bat-like wings that are a deep red and black gradient with gilded tips. He wears a large gold pendant of multiple bat wings with a red jewel in the center that connects to a black and gold embellished choker and two gold chains on the side, and a black-furred shawl over his shoulders. On his arms are six rows of golden triangle patterns, and there are black vertical markings on his torso. He wears black harem-like pants with two gold chains, with a red jewel pendant on each side, and a white cloth with gold patterns in the front.