If we use Jim's books as a guide we would see that we have a wizard for a PC (Harry), a Holy Knight (Michael) and perhaps a vampire (Thomas) and otherwise supernaturals seem to be more along the NPC line. Again, that's for Jim's version of Harry's world.
I don't know, we had more characters that I think could qualify as PC's. Billy the werewolf, Fix the changeling (not Fix the Knight), and Butters are all PC level characters. They aren't in the same power level as Harry and Micheal, but they do bring other abilites to the table to flesh out a group. After all, what good is playing a bard without a party to buff?