Suggestions by @sawgerrera

Helen Slater

as Kara Zor-El in The Donnerverse

Winona Ryder

as Barbara Gordon in The Donnerverse

Kurt Russell

as Harrison Ford in Justice League Earth 789

Ryan Reynolds

as Hal Jordan/Green Lantern in Christopher Nolan's Justice League

Christopher Judge

as J'onn J'onzz/Martian Manhunter in Tim Burton and Richard Donner's Justice League

Kenneth Branagh

as Arthur Curry/Aquaman in Tim Burton and Richard Donner's Justice League

Michael Biehn

as Hal Jordan/Green Lantern in Tim Burton and Richard Donner's Justice League

Harrison Ford

as Hal Jordan/Green Lantern in Tim Burton and Richard Donner's Justice League

Marlon Wayans

as Dick Grayson in The Donnerverse

Kenneth Branagh

as Arthur Curry in The Donnerverse

Daniel Kaluuya

as Two-Face in DC Universe Reboot/Sequel