Loki Laufeyson is a major character in the Marvel Cinematic Universe. Introduced as a villain, as time goes by, he eventually becomes an anti-hero.
He is the biological son of Laufey, the adoptive great-grandson of Buri, the adoptive grandson of Bor Burison, the adoptive son of Odin Borson and Frigga, and the adoptive younger brother of Hela Odinsdottir and Thor Odinson.