The Joker in Alice in Borderland is not an actual person but a metaphorical and mysterious entity. It represents a gatekeeper or psychopomp who guides souls between life and death, essentially serving as a bridge or ferryman in the Borderlands. The Joker's role is to offer those caught in the borderline state a choice between crossing into the afterlife or returning to the living world. This entity appears after the final game and symbolizes the transition between life and death rather than being a playable character or antagonist in the traditional sense. In the live-action series, especially by season 3, the Joker is depicted as a figure who interacts with Arisu, providing him with a final choice between joining the land of death or returning to life. This concept aligns with the manga, where Joker is seen as a ferryman carrying souls to the afterlife. Thus, the Joker is more of an existential figure within the story's mythos than a simple character.