<Li> Tip "T.I." Harris as Dave: A member of Lang's X-Con Security crew . </Li> <Li> David Dastmalchian as Kurt: A member of Lang's X-Con Security crew . </Li> <Li> Hannah John - Kamen as Ava Starr / Ghost: A woman with molecular instability, who can phase through objects; she is only considered a "villain" because her attempts at survival clash with the heroes' goals . The character is traditionally portrayed as male in the comics, but the creative team believed that the character's gender was irrelevant to its portrayal, and felt casting a woman would be more interesting . John - Kamen enjoyed this "blank - slate" aspect, allowing her to mold the character as her own . Producer Stephen Broussard said that they wanted to cast a lesser - known actress to help maintain the mystery of the character, and John - Kamen "blew us away". RaeLynn Bratten portrays a young Ava Starr . </Li> <Li> Abby Ryder Fortson as Cassie: The daughter of Lang and Maggie . </Li>

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