The document discusses four main narrative theories: 1) Vladimir Propp's theory that character roles can be classified into clearly defined types with predictable actions, 2) Levi-Strauss' theory that narrative tension stems from opposition or conflict reflecting cultural values, 3) Barthes' theory that narratives establish mysteries to gradually solve through five codes, and 4) Todorov's theory that narratives follow a structure of equilibrium, disequilibrium caused by disruption, and a new restored equilibrium.