Ok, let my try to set some general guidelines really quickly then. I still have quite a bit of information I need to add but hopefully this will give you a general idea. 

 My main worry is that each character needs to have a balance. A powerful warrior might be able to take on 5-10 enemies at once, but not 100. Mages or wizards have basically the same restrictions . While they can cast powerful magic, if they go beyond their means it can kill them in the process. Magic is also rather unstable and can backfire if someone does not know what they are doing. I'm hesitant about angels and demons because for the most part they are immortal, but if they have limits, perhaps on how much power they can use within the mortal realm, than something like that would be fine. Obviously I don't want anyone to be able to strike down an entire army by blinking. 

I have added a strength and weakness section to the CS, so that should help. My main concern is that no character can be immortal. I try to leave most of a characters skill up to the player, but If something is obviously overpowered I will step in and discuss it with them. I hope this answers your questions, but if not I plan on having a section about magic and combat added sometime soon. .