Priest-
They should be part warrior and part healer. They should have some sort of special ability using there holy symbol. You could loot unique holy symbols that allow you to add effects to your holy abilities, you could also make them out of unique precious metals for added effect.
Everybody always assumes that undead are the only creature that priests are specialized against, but they could be fighting demons and devils (exocisms), abberations (wards against alien beings), and elementals (raw forces of nature). The judao christian model of priests are not the only style of holy men and women. Budist monks can practice martial arts, how cool would a martial arts priest be?
Again, an unarmored priest may be a unique version. They could have better powers, more spells, or extra channeling type powers. It would be the difference between cloisted priests and the crusading ones.
Lets see diety favored weapons make it into the game for further customzation of priests of various deities. I'd like to see good, evil, and some unorthodox deities as well. God of thieves for rogue style priests, god of elements, a god that seems like it's from an HP Lovecraft novel (alienist priest?), god of peace, god of time (chronomancy), etc. So many great ideas for deities out there.