Loki is one of the giants, the enemies of the Norse gods. He became a member of the Aesir (the gods) when Odin made Loki his blood brother. He is the god of fire, deception, mayhem. After causing the death of Balder, he was bound by the gods until the Ragnarok, at which time, he will be freed. Loki fathered Fenris, the wolf that is prophesied to kill Odin during Ragnorok; the Midgard Serpent, prophesied to kill Thor in the same battle; and Hel.
Like Odin (though to a lesser extent), Loki bears many names : Lie-Smith, Sly-God, Shape-Changer, Sly-One, Lopt, Sky Traveller, Sky Walker and Loftur among others.