Love this idea. The character I'm interested in playing in a game would fit here, so I'll definitely be watching this. The premise sounds so interesting!

I'm a bit confused as to what you mean by powers being based off off their original angel/demon patron - does that mean the player can choose what their power can be as long as it relates to the angel/demon? Like if it's fire, fire-bending would be an obvious choice, but would you leave room for creativity?

Also, if you're letting characters keep their original powers, does that mean they don't get additional powers related to their angel/demon patron?

Finally, if angels and demons are enemies, how would that affect cr between angels and demons?

Would be willing to help with coding and such, if you're looking for help in that area.