Well, mine's not about devils or such... More about demons/daemons in the more ancient sense... Of course, there will definitely be a great many bad ones to run from or fight. ^_^
One thing I'll have fun with, though, is the intrigue of the neutral ones... Ones that may even be helpful to have around... but if you make one wrong move, you could lose a body part... It makes things exciting. lol
If anyone has any ideas that could help me out while I'm at it, I'm all ears. ^_^