John Watson is

Jam is something people use to describe him, because he is cute and yummy and likes Jam

Often gets kidnapped by Mycroft or some other random person because of Sherlock, people have never heard of mobiles

Honest and sticks up for what he believes in so he gets in a lot of trouble very often because he stands up for Sherlock

Nice, this helps cover up for Sherlock's lack of tact and some of his less normal tendencies

Was and still is thought to be gay by Sherlock and some of his girlfriendsand basically all of London (I think he's gay to, John and Sherlock would be a cute couple )

Army doctor and civilian doctor a good one at that, Doctor Watson

Trust issues because of the war, wouldn't you

Sees but doesn't observe as Sherlock points out very often

Outgoing but not as much as Sherlock, No one is as outgoing as Sherlock bar Mycroft and Moriarty

Neat but that doesn't help Mrs Hudson clean up after Sherlock