John over at the Land of Nod wrote an interesting little piece about the everyman, aka "the commoner". His point is that most people aren't heroes, they're just ordinary folk. He then goes on to give examples of some special abilities that characters in a game might have if they are one.
Nice little mechanical bits that I think make sense and add some flavor to being common.
It hit home with me, because I am working on a project right now that is all about a group of peasants and their attempts to do something extra-ordinary with their lives.