Max will probably be the young naive diplomat to start with. I plan on having him be the wide-eyed, first time out of the temple adventurer. More trusting of his companions, especially those who seem more wise to the ways of the world, but when evil is found a zealot for destroying or redeeming it.
He will be a ranged damage dealer and when he gets spells he will focus on protection type spells. As he levels I will add more skill ranks to diplomacy. As he grows up, I'd see him a bit more violent than Shepherd Book, but with the more of the example version of religion than the zealot, YOU MUST CONVERT guy.