I have not watched the show, but this sounds interesting.
Curious about the demon character aspect.
Just like Heaven, Hell has a hierarchy too of course.
Those consisting of known demons like Asmodeus, Abbadon, Mammon, etc. Personifications of the Seven Deadly Sins.
Is it safe to assume the named demons/demons of rank are ones that would have been able to somehow bypass Lucifer, and emerge on Earth? Or would those interested in making demons just make up complete OCs, then attempt a convincing background as to how they escaped Hell?