In my quest of learning more about character, I'd found a tidbit about heroes and supporting characters that surprised me. This came from a newsletter written by Chris Soth who created the mini-movie method. I tend to use it rather than the three act structure. You can check out his site at www.milliondollarscreenwriting.com. With any hero there's a character arc. Whether he has to learn to be less selfish, or learn to believe in herself, I find that I connect with the hero when he or she must go through something and come out a better person. Isn't that our jobs? To connect the reader to our hero? And when they don't the story is then called a tragedy.
There are supporting characters that are necessary. Heroes tend to have a nemesis, possible love interest, straight man or woman, a sidekick, gap-inducing character, etc. Chris suggests having at least two mirror characters. One character that shows what the hero can and should become--giving, self-confidence--and another, maybe the bad guy, who shows the reader what would happen if the story was a tragedy.
I understand the purpose of mirrored characters, but I'd never heard of this before. Have you?