this is a stupid idea but why not calling them based on their personality, based on the 7 deadly sins or the 7 virtues.
They're probably going to show up pretty often, since, as I've said, I think it was one of the biggest wasted potentials. So I seriously need help! Am I supposed to use "the Alistairs" or just "Alistairs"?! Please help, I'm stuck, and not in a good way!