In-depth character stories and personalities

Characters that attach to heart strings of players instead of zombie fodder. This would bring people in for more and look for story every time the character speaks to their enlisted follower and maybe they could even have a conversation during rides in the car or hiking on foot. Since every character would feel more unique have more of a voice, players would remember each character as a person, not a generated object. I feel that everyone would appreciate these details in characters and their characteristics.