It’s possible that The Externals could help provide a bridge between Gambit and other movies in the X-Men universe like Deadpool, New Mutants and X-Force.
Red Death, will be featured in the Gambit movie, although that has not been confirmed by anyone at the studio.
Outside of Candra, another External character that is extremely striking is Gideon due to his connections to X-Force, New Mutants, Deadpool, and even Gambit.
It’s possible that the inclusion of Candra can lead to the introduction of a group known as The Externals in the studio’s X-Men universe.