Narrative theories help understand narrative structure by identifying common narrative elements and character roles across different stories. Vladimir Propp analyzed Russian folktales and identified that narratives follow a structure determined by 8 character roles like hero, villain, donor. Propp's theory is applied to Star Wars to show how Luke, Darth Vader and others fit character roles and drive the narrative. While Propp's theory explains many stories, it does not apply to all narratives like Pulp Fiction that uses nonlinear storytelling. Overall, narrative theories provide frameworks to analyze how specific texts employ narrative devices and progress their unique stories.