<Li> Chris Hemsworth as Thor: The crown prince of Asgard based on the Norse mythological deity of the same name, who has become a "lone gunslinger" searching for the Infinity Stones . Hemsworth had become "a bit bored" with the character after portraying Thor four times previously, and wanted to take some risks and experiment: the character has shorter hair in the film, wears a different outfit, his hammer Mjolnir is destroyed, and he loses an eye . Director Taika Waititi added that "stripping" the character down like this allowed him to become a refugee at the end of the film . Waititi also wanted to use more of Hemsworth's comedic talents showcased in films like Vacation (2015) and Ghostbusters (2016), and cited Kurt Russell's portrayal of Jack Burton from Big Trouble in Little China (1986) as an influence on the character . </Li> <Li> Tom Hiddleston as Loki: Thor's adoptive brother and nemesis based on the deity of the same name . Hiddleston was interested in how Loki's attitude has changed, saying, "he is always a trickster . It is trying to find new ways for him to be mischievous". As the ruler of Asgard since the end of Thor: The Dark World (2013), Hiddleston notes that "Loki has devoted most of his efforts to narcissistic self - glorification . Not so much on good governance ." He also added that "the idea that Thor might be indifferent to Loki is troubling for him...it's an interesting development ." </Li> <Li> Cate Blanchett as Hela: Thor's older sister and the goddess of death, based on the deity Hel, who is inadvertently released from prison . Screenwriter Eric Pearson included the idea of Hela being Thor's sister in one of his drafts at the encouragement of executive producer Brad Winderbaum . The decision to make Hela related to Thor, as opposed to Loki as in the comics and Norse mythology, came from needing more impact with Hela and Thor's final confrontation . By making the change, Pearson felt Hela became "the thing that (represents) what it is to rule Asgard, (Thor's) family, what he's been told, what he hasn't been told ." Blanchett found it difficult to portray the character in a motion capture suit rather than costume, feeling Hela's headdress is "such a huge part of" the power of the character that she would have liked to wear it on set . Hela's design was taken from the comic Thor: God of Thunder by Jason Aaron, while the character Gorr from that comic, who has the ability "to manifest an infinite number of weapons", inspired a similar ability for Hela . Blanchett worked with stuntwoman Zoë Bell and Hemsworth's personal trainer Luke Zocchi, and studied capoeira for the role . </Li> <Li> Idris Elba as Heimdall: The all - seeing, all - hearing Asgardian former sentry of the Bifröst Bridge, based on the deity of the same name, who has gone into self - imposed exile during Loki's reign . After Hela invades Asgard, he helps to hide its vulnerable citizens . Describing Heimdall's character arc in the film, Winderbaum says, "he's gone from this elder statesmen, the gatekeeper to Asgard, to this badass warrior - wizard character who lives in the hills and kicks a lot of ass throughout the entire film ." </Li>

Who plays thor sister in the new movie