I always have characteristics for my characters but not most the ones listed in Lee's post. I don't care what eye-colour they have and don't think its worth noting as the actor could change all that. I look at the background and psychology of the characters more as this is what defines how they act and respond to each other.
And that's the point of developing characters: to know how they are going to conflict, act and react with each other and situations. Do whatever you think will get those answers down on paper. I have my own system.