<Li> Julian Dennison as Russell Collins / Firefist: A young mutant with pyrokinesis who is being hunted by Cable . Reynolds insisting on casting Dennison after seeing him in Hunt for the Wilderpeople (2016), with the character "tailor - made" for him, and no other actors considered for the role . The character is considered a villain for much of the film, which Leitch thought was an "interesting take on the whole angle of the villain". Dennison felt the role was particularly special because, being "chubby", he would watch superhero films and "never see anyone like me . I am excited to be that for other kids who look like me ." Sala Baker portays an older Firefist, in Cable's future . </Li> <Li> Zazie Beetz as Domino: A mercenary with the mutant ability to manipulate luck, who joins Deadpool's X-Force team . Leitch described the film's version of the character as Beetz' own "real fun interesting take", with the actress interpreting the character as an only child who forms a "sibling sort of relationship" with Deadpool, with "that back - and - forth banter where she is not dealing with his". Beetz began "working out everyday" when she got the role, which required her to shoot guns and use "full body" physicality, and chose not to shave her armpits to match the changing perception of the practice among the general public and to prove that it is "not something that is gross or shameful". </Li> <Li> T.J. Miller as Weasel: Wilson's best friend and the owner of a bar frequented by mercenaries . </Li> <Li> Brianna Hildebrand as Negasonic Teenage Warhead: A teenage X-Man with the mutant power to detonate atomic bursts from her body, she is now a "new level of X-Men" after being a trainee in the first film . Hildebrand felt that "it's cool that she's grown and matured and she still has so much of this essence of a punk kid" from the first film, and added that the character would have a "cooler" costume in the sequel . The filmmakers intended to have Hildebrand shave her head to indicate that her abilities burned off her hair, but she was unable to do so due to a television series commitment . The film also reveals that Negasonic is in a same - sex relationship, which is the first openly LGBTQ relationship depicted in a Marvel film . When Reynolds asked Hildebrand how she felt about the potential storyline during development, the actress--a member of the LGBTQ community herself--responded positively with the stipulation that the film not make "a big deal" about the relationship . In a statement, GLAAD President and CEO Sarah Kate Ellis praised the relationship as "a milestone in a genre that too often renders LGBTQ people invisible, and should send a message to other studios to follow this example of inclusive and smart storytelling". </Li>

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