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Demon form has yet to be revealed to anyone.

Male DEMON name: Samarkand
Human name: Rainer Daewon 
Human age: 22
Apartment Number: 20
Sin: Dishonesty
Underworld position: Son of a powerful 'god,' a demon too powerful for anyone to face. Despite the cult that surrounds his father, these 'gods' are often not powerful enough to topple a kingdom or throne, unless they manage to be particularly influential. Likewise, a kingdom or throne is unlikely to be able to face a 'god' in their own soil.

Samarkand is an unnamed 'god's son, and decided to not live under his hold and become himself, regardless of the fact that he's plenty powerful in comparison to other demons.