I can't find a link, but AFAIK:
Bill- Obviously a war veteran. I seem to remember that he fought in 2 wars, before being forcibly retired. He didn't leave the city immediately because he could either stay and fight (and re-live his glory days) or run and be a coward.
Louis- Just a regular office worker, but either the Infected killed his wife and kid, or his wife left him. Either way, he is staying to fight because he has no-one to miss him if he falls, but he wants to protect humanity
Zoey- Film student, failing/not getting the grades she needs to get, on account of being captivated with the zombie genre of film. Huge zombie fan, meaning she knows her stuff. When the infection starts, she feels that she knows enough about the enemy to help. That and shooting zombies gets her out of class.
Francis- Biker/all round tough guy. A bit of a thug, meaning that he's in his element when law and order flies out of the window. Knows he can't survive alone, so travels with the group.
I'm fairly sure I've seen an official source to confirm/expand on this, not sure where though...
Bill- Obviously a war veteran. I seem to remember that he fought in 2 wars, before being forcibly retired. He didn't leave the city immediately because he could either stay and fight (and re-live his glory days) or run and be a coward.
Louis- Just a regular office worker, but either the Infected killed his wife and kid, or his wife left him. Either way, he is staying to fight because he has no-one to miss him if he falls, but he wants to protect humanity
Zoey- Film student, failing/not getting the grades she needs to get, on account of being captivated with the zombie genre of film. Huge zombie fan, meaning she knows her stuff. When the infection starts, she feels that she knows enough about the enemy to help. That and shooting zombies gets her out of class.
Francis- Biker/all round tough guy. A bit of a thug, meaning that he's in his element when law and order flies out of the window. Knows he can't survive alone, so travels with the group.
I'm fairly sure I've seen an official source to confirm/expand on this, not sure where though...