It is not accurate to say that the gods chose their charges: the ones they love. It is also not accurate to say that that the charges choose their patrons. Rather, it is something that seems to happen simultaneously.
Charges are not servants of the gods, because they would choose to do the same activities whether they knew about the gods or not. Charges are close to a god because they share the same goals and the same agendas with their "patron".
And, in a way, you don’t have free reign over which patrons you choose. Because your choice of what virtues, ideas and activities to promote and do are influenced by your genetics and environment; things you have no control over.