Who is the brother of Thor?

Loki Odinson is Thor’s adoptive brother and nemesis, a master of Asgardian magic and sorcery, and a supervillain who regularly returns from apparent death. Loki’s jealousy of Thor for being the crown prince of Asgard brings them into conflict and, following a failed plot to take the Asgardian throne for himself, Loki attempts to conquer Earth by subjugating humanity, inadvertently resulting in the formation of the Avengers. Though he is defeated and imprisoned, Loki manages to replace his adoptive father Odin as the ruler of Asgard. He becomes an antihero when he aids Thor in saving Asgard from Hela, but is killed by Thanos soon after.