loki is the brother and enemy of thor. in the marvel cinematic universe, loki is one of the main characters and one of the most iconic characters of the franchise. he's initially a villain but later he becomes an antihero. the character loki is played by tom hiddleston. in the movies, loki is said to be thor's brother (therefore odin's son), only to discover he was adopted and is in fact a jötunn and son of king laufey, ruler of jötunheim.