Loki is the brother of mythological characters.
Býleistr ( ` calming-lightning ' , sometimes anglicised Byleist ) is the brother of Loki in Norse mythology . In Norse mythology , Loki ( Anglicized ( [ ˈloʊki ] ) ) , Loptr , or Hveðrungr is a god or jötunn ( or both ) . Loki is the son of Fárbauti and Laufey , and the brother of Helblindi and Býleistr . By the jötunn Angrboða , Loki is the father of Hel , the wolf Fenrir , and the world serpent Jörmungandr .