The trickster god associated with mischief and chaos in Norse mythology is Loki. Known for his cunning and unpredictable behavior, Loki often challenges the gods and orchestrates chaotic events. His dual nature as both an ally and adversary showcases the complexities of good and evil. Loki's actions lead to significant transformations within the cosmos, particularly during Ragnarok, the end of the world. His ability to shift shapes and manipulate situations makes him a compelling symbol of the unpredictable aspects of human nature, emphasizing the theme of chaos in the structure of the universe.