"There are plenty of different Banners that any player of the Nine Kings can work towards affiliating their character with. Keep in mind that all Kingdoms, Temples, and Cults maintain different requirements for foreigners seeking membership. Make sure your player character asks around to find out what prerequisites are needed before naively pledging themselves to any house.
Another aspect to ponder is whoever you choose to join any group you will also incur new enemies in response to your new affiliation status. Your choices in terms of whom you merge with will dictate who your enemies will become. Geography also should be taken into account as depending on where your player character is situated could be an area which has a large contingent of npc's that are already against you..."