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Real people are quite accidental, the result of a random jumbling of genes and a chaotic life.
But story people are made to order to do a specific job. I can hear some of you pooh-poohing this notion, but it's not my idea. It goes back twenty-five hundred years to the classical playwrights. In Greek tragedy, the main character was always specifically designed to fit the particular plot. Indeed, each protagonist was constructed with an intrinsic hamartia , or tragic flaw, keyed directly to the story's theme.