This is something that I feel would work great here: characters having skills based on what they did before the outbreak, such as gunslinging, skating, driving, free-running/parkour that would give people a certain sense of who to go to when they need a certain thing. While I'm not suggesting some BS 20 point system, I'm suggesting something that would make it so people would have a better sense of who they're going to, and just quite what the other person is going to do. Take my character for example, he would fit in the scout area, and skills I'd include with such would probably be stealth, marksmanship, parkour/free-running, skating, biking, etc. Another thing to say would be these guys who run around with swords to use offensively, they would have skills such as longevity in combat, strikes that cut deep due to the strength required to handle a sword, etc, etc, etc.