Vladimir Propp studied folktales and identified 8 character types and 31 functions that advance the story. Propp's theory includes character types like the hero, villain, and princess, and functions like prohibiting the hero or the villain learning about the victim. Levi-Strauss argued that narratives rely on binary oppositions like good/evil that create conflict and drive the story. Both theories can apply to teen horror movies, which feature character types and explore oppositional themes of good versus evil. Barthes' enigma code also fits the genre as teen horror often starts with a mystery like an unsolved murder to pique audience interest.