Having friends and rivals would be very interesting, especially if you had opportunities to screw them over or enslave them.I like the idea of having some friends and rivals in the guild that you encounter randomly or that ask for help. I am not sure about Julia being in this role.
I see, so the different factions are keeping eachother in check. Maybe the player can start with taking control over the slavers guild since it's our home turff.But there is no true king of this Rome, aside from the Pope. The "king" of Taurus is only a title.
I am excited to see what you and qwerty make in 2025. The ideas you both have sound great.