What term describes a character's encounter with mythical or otherworldly beings?

The term that accurately describes a character's encounter with mythical or otherworldly beings is "Character v supernatural." This type of conflict involves interactions between characters and elements that transcend the normal human experience, including gods, spirits, or other mythical entities. Such encounters often place the protagonists in a realm where they must deal with forces beyond their control or understanding, leading to significant character development and thematic depth.

In contrast, the other options refer to different types of conflicts. "Character v society" focuses on a character's struggles against societal norms or institutions, "Character v nature" pertains to conflicts between characters and the natural world, such as disasters or challenges posed by the environment, and "Character v self" deals with internal struggles within a character, including moral dilemmas and personal crises. Each of these types of conflicts has its own distinct characteristics, but none specifically encapsulate the interaction with mythical beings as the "Character v supernatural" conflict does.