The title says it all, I don't think I'm the first to ask, but bro, I really need NPCS in my crew, especially because I don't have friends to play with...
crew upgrade: in addition to inviting NPCs to your crew, you could give the option to train your crew member and he would automatically look for a master for that.
fleet: you can summon pirate captains to your crew and thus change to fleet. NPCS captains of your fleet would have the mission to conquer territories in your name, maritime or not.
Pirate Doctors: Pirate doctors in your crew would heal you and the other crew members.
protect territories: your NPC pirates would stay in your territory defending it.
Customized skins: you can customize the NPCS skin and put on clothes too.