PART 2 - CHARACTER CONSTRUCTION
Imagine how worried we would be for a protagonist who decides that the Path he is traveling is very dangerous and hides to let things be solved alone. Or how much we would worry about the repentant gunman who hangs up his revolvers and swears he will not use them again, but at the first sign of trouble, he puts on his guns and reassumes his old behavior. It is the fight of the character, man or woman, full virtues and defects, which catches the audience and makes you worry about the development of the story.
Multimedia Production Handbook
In the movies, the protagonist almost always has the main role, the most interesting, and is the character that is most on screen, for the simple reason that it is the destiny of that person that we are following. Writers often name their films with the name of the protagonist: Erin Brockovich, Donnie Brasco, Michael Collins, Citizen Kane, Ninotchka, Tootsie - the list is endless. From time to time we find a story where two people want more or less the same thing and struggle to achieve almost the same goal. But in these stories, like "Bonnie and Clyde" and "Butch Cassidy and the Sundance Kid", the protagonist is usually the person who makes the decisions that mega the story develops, change. In these cases, Clyde and Butch, who have no more time on screen than their peers, but are the protagonists because their actions are imitated by the partner, their decisions make history develop and their desires are imposed on those of the partner.