Loki is one of the main antagonists and the God of the underworld in Norse mythology. He is the adoptive brother of Thor, Heimdall, Baldr, and Tyr. Odin the king of the gods and his wife, Frigg, are Loki's adoptive parents. Loki is the archenemy of Thor. Just like a lot of underworld gods (such as Hades from Greek mythology, his Roman equivalent named Pluto, and Osiris from Egyptian mythology), he does a lot of bad deeds.