Can you show your character's common sense overcoming difficulties on other areas of life (say employment)? Can you show characters trying to develop common sense? I would think there could be some comedy gold there.
Can a character be paralyzed by his common sense telling him\her\it not to intervene in a situation yet every other instinct they have is screaming at them to do otherwise? And which proves to be right? Do any of your characters come from a background where common sense is not usual, they've seen the limitations and damage this can do so rebel against it and are now renowned for developing the quality? How do others they've left behind as they progress feel about that? (I could see resentment being a real possibility).