Players who opt to enter PvMP with their PvE (Player vs Environment) character enter on the side of the Free Peoples... or as the community has lovingly named them: Freeps. Since you're allowed to use any character you may have (at level 50) the races and classes for Freeps is the same as in PvE. Thus far this has been somewhat problematic for the other side (Creeps) since they have a more limited range of classes at their disposal.