Believing you and your life are either literally or metaphorically the center of a metaphysical narrative in which you are the protagonist and that your life obstacles or
people you disagree with or dislike are forces of evil. Most often seen in
people who have consumed large amounts of entertainment such as books, movies, or video games which have a concrete "good or
bad" for most of their lives.
"My sister in law keeps referencing Harry Potter online when
politics are brought up. I
think she may have a protagonist complex."
"Quit being so self righteous. You
sound like you have a protagonist complex."