Warner Bros./Legendary’s upcoming “Dune Messiah” has made two additions to its cast, as Nakoa-Wolf Momoa and Ida Brooke are set to play Paul Atreides and Chani’s twin children, Leto II and Ghanima.

Last week, it was announced that young actors Nakoa Wolf-Momoa and Ida Brooke had been cast in Denis Villeneuve’s third Dune movie, joining an ensemble that includes a large assortment of Hollywood’s ...