In Norse mythology, Thor and Loki share a complex relationship marked by brotherhood and rivalry. Thor, the god of thunder, embodies strength and protection, while Loki, the trickster god, represents chaos and cleverness. Their adventures often highlight a contrast between established order and unpredictability. Despite Loki’s deceitful nature, he is portrayed as a companion to Thor on numerous quests. However, this bond is fraught with tension, ultimately leading to significant conflict, especially as Loki's actions contribute to the Ragnarok, the end of the world in Norse cosmology.