The document discusses how films establish characters, specifically protagonists and antagonists. It states that protagonists must be likeable and relatable so audiences connect with them and want them to succeed. Protagonists are often given significant screen time so audiences learn about their personal lives and can follow their journey. Meanwhile, antagonists are usually in conflict with the protagonist but don't necessarily have to be villains. Films sometimes challenge audiences' expectations of who the protagonist and antagonist are through plot twists or ambiguous characterization. Examples from films like The Professional and The Dark Knight Rises are given.