1: no angels- your character must be a demon or (maybe, possibly) a human.
2: Demons must be demons- in other words, no squeamish demons, or demons who are pacifists etc.
3: No god-modding
4: If you wouldn't do it in public, don't make your characters do it in public chat. Believe me, I don't want to get on in the evening and see you guys reenacting 50 shades of grey.
5: Apply by sending me a message with your characters name and what their specialty is- for example, a demon of blood has the power to manipulate the blood of those he has tasted. Don't make it overpowered, do make it interesting, and do bear in mind that certain specialities are taken: Yaoi (Gayness malexmale), Dark Alleyways, Blood, Venom, Death, and Hate for example.
6: High ranks, such as one of the 7 deadly sins, or being a Prince, Duke, Lord, or Merchant of Hell are earned. Don't beg, or I will call down the powers of the King of hell and destroy you completely (at least in the role play)