Archangel - Holy Fighter type with lots of buff/debuff skills with some constant mild damage with small resource cost
Demonish (ala hell-boy) with shapeshifting skill into a demonic character, some skill are different when in demon mode
Witch - a curse type play style :)
Awesome suggestions. A demon shapeshifter would fill a bit of the gap left by druids. Having read none of the lore besides what's presented in the games, I don't know how viable any of the things in this thread will be though.