OK, much clearer now.
I don't think the party wizard, Tak, is a pet NPC(and I hope that the players would tell me if he was). A self-righteous, know-it-all, sex-obsessed-with-a-the-self-control-of-a-pit-bull-doped-up-on-spanish-fly wizard, but not a pet NPC. I made a wizard to help cover that base within the party(nobody wanted to play a wizard), and he's just kinda stuck around and become an integral part of the group. Like I said, he doesn't show them up, although he does love to use flashy evocations like Fountain of Blood and Fireball in battle, and damn the consequences(FAve Quote: "Well then you should've jumped out of the way Angcuru!"). He's become a reliable member of the party, and I try to make sure that I don't pull too much attention to him.