Classes is what you do.
Shop Keeper: You need to make a shop for you to play this class. Set prices and objects you create into your shop.
Plumber: You use guns and alien technology.
Omnitrix Weilder: You use an Omnitrix or other similar devices. You need to make an Omnitrix for your character to play this class.
Healer: You stay at the camp of your army and heal wounded warriors.
Weapon Maker: You stay at the camp of your army and make weapons for your teamates.
Bounty Hunter: You move every turn, hunting down certain people for Omni-Points. You can choose which bounty to take.
Admins can make more classes.