As far as the rest of the announced cast cast goes, along with Vin Diesel and John Cena, Jordana Brewster is on board to reprise Mia Toretto, who was last seen in Furious 7, which served as a sendoff for her husband, Brian O’Conner, played by the late Paul Walker. After initially being unsure about if she’d return for Fast and Furious 9 due to being disappointed with how the series’ female characters were treated, Michelle Rodriguez agreed to reprise Letty Ortiz after a female writer joined the production.
Article source: https://www.cinemablend.com/news/2474595/john-cena-has-officially-joined-fast-and-furious-9