We have played the characters for years, Loving some and disliking others. A good backstory can help with this. An example would be the pyro, If one could make why it became a pyro would be great, Without giving up gender on the character by first person view. The purse above its locker could it be a loved ones purse that perished in a fire causing him to become the true pyro we all know and love? Why not see why the characters joined mercenary groups..