Who is Loki, Odin's brother, and what role does he play in Norse mythology?

Loki is a mischievous and cunning trickster god in Norse mythology, known for causing chaos and trouble among the gods and humans. He is the blood brother of Odin, the chief god, but is often seen as a disruptive force in the pantheon. Loki's actions often lead to conflict and challenges for the gods, and his deceitful nature ultimately leads to his downfall and punishment.