Actually each seraph aka archangel is associated with one of the seven heavenly virtues. Likewise the seven princes of hell are associated with one if the seven deadly sins. Each of these have opposites. So the heavenly virtue of charity is countered by the deadly sin of greed. This is a possible attribute system. Or it could lead in to the seven demon princes of hell being major antagonists. I learned this while researching for a game idea I had. I would appreciate it if anyone who read this didn't take any of my ideas.