The Asmodean Acolyte trait got me thinking about a young tiefling who was the bastard of some minor scion of house Thrune and decided that the way to earn the respect of his father and a position in the house was to join the church. Despite being able to Pass for Human (racial trait) he was shunted out of the official clergy before he really got started and kind of fell into the more underworld aspects of the church, eventually leading a ring of informants and other street types. He's still trying to earn the respect of House Thrune, just doing it in a way he's more suited to.
I'm putting together a tiefling investigator. He'll do skill monkey stuff and party face. He'll have the Mastermind and Bonded Investigator archetypes, which seem like pretty good flavor for this type of wannabe mob boss. Eventually getting an imp familiar seems like a good way to show the character becoming more influential with devils as he gets more powerful.