There is a common writing adage that your main character need a personal trait flaw. I see that argument as being that a personal trait flaw creates the potential (not necessarily realization) for character growth over the story as it progresses the central conflict and requires the MC to address his flaw during the climax. But is this argument an over-simplification? Can a flaw be something other than a personal trait? I'm thinking of two examples where I'm not sure if a personal trait flaw is necessary: One would be a redemption story where the MC did something bad in his past and tries to right his wrongs. Let's say he killed someone, and now tries to do good for others to make up for it. Does he need to have a personal trait flaw, or is his history enough? Second would be a different redemption story where the MC made a bad decision in his past and over the course of the story faces a similar decision. Does he need to have a personal trait flaw, or is his history AND second chance over the same decision enough?