In my tabletop games, or anything else I do dnd related even stuff like NWN2 persistent world stuff, Commoners are essentially "Level 0" or "Level 1" because of how nonsensical it'd be for it to be anything but. As a higher level means they'd have higher stats that are common of such levels, which tends to make little sense for someone who doesn't risk their life in battle or do something particularly outstanding that would aid their 'level'.
