Existential themes refer to the exploration of human existence, freedom, choice, and the search for meaning within life. These themes often delve into questions of identity, purpose, and the nature of reality, challenging characters and audiences alike to confront their own beliefs about life and existence. In narratives that utilize multiple timelines and parallel narratives, existential themes can manifest through the juxtaposition of different life paths and the consequences of choices made, prompting reflection on what it means to truly live.