Now, For the last thing: classes. 
Classes: Witchhunter: A boy from Salem. essentially the futuristic version of a Spellsword. these are good with guns, magic, and any crap they pick up. they haven't changed since Salem though, because they hunt those who use blood magic, and those whom they hate.((Romulus is not one, a justiciar is different.))
Urban Knight: Bringing chivalry to the streets. these are the tanks. plain and simple. they wear giant armor, they carry big guns, and they kick butt. but they took the chivalry code. they must follow all rules of a knight. ((yes, you must obey this.))
Assassin: They got your back, stabbed. They move through the dark, and the neon lights of nightclubs, bars, and corporate buildings. all to kill someone. their weapon always finds their mark, no matter what the cost, though they too are bound by a creed. (( look up the creeds: the assassins creed, chivalry, and Bushido.))
Hacker: Having a (key) stroke. These guys can break into anything if it's computer operated. they're also good with guns, and drones, and cars, and ok, never mind. the point is, you want in computer? call one up. 
Justiciar: Church AND State certified. These guys are like the anti-witchhunters. They don't perform blood magic (( there are exceptions)), but they're more secret, more forgiving, and more brutal. they have more brutal methods of dealing with Blood magic users. They also have diplomatic immunity, and Church protection,so they're above the law. 
Mage: I believe in magic! they're just mages. that's all.
Bounty Hunter: Fun with guns. these are a knight, assassin mix. they know every weapon, and everything there is to know about them.just like the assassin, they will find you, and they will kill you if you are their prey.