9 Noble Demon Families

The Dark World is ruled by a coalition of 9 noble families, all lead by a powerful Demon. The families do to some degree cooperate with each other, and as a united front has made deals with the governments of the Human World.

They are mentioned in Taimanin RPGX but who is and who isn't part of it and how much power they really hold, is not yet explained.

Policy
They seem to value non interference, some degree of cooperation and peace. They don't seek active conflict with the Human World and especially places like Amidahara Prison, came to be, as a cooperation effort with the governments of earth. Establish law and order, between Demon and Human.

Hell Knights are the enforces in the Dark World, and guard the 9 noble system of rule.

In RPGX Marjaana is seen as one of the 9 nobles, even though she isn't technically a Demon but a Brain Flayer Queen, which became a refugee in the Dark World.

Nobles

 * Marjaana (and her guard)
 * Teutates (and the wraith)