Suggestions by @aaronkime

Domhnall Gleeson

as Mad Hatter in James Gunn's DC Cinematic Universe

Fionn Whitehead

as Scarecrow in James Gunn's DC Cinematic Universe

Olivia DeJonge

as Supergirl in James Gunn's DC Cinematic Universe

Navia Robinson

as Batgirl in James Gunn's DC Cinematic Universe

Adelaide Kane

as Wonder Woman in James Gunn's DC Cinematic Universe

Nathalia Ramos

as Silk spectre in DCU

Javier Bardem

as the Comedian in DCU

Dennis Haysbert

as Perry White in DCU

John Harlan Kim

as Jimmy Olsen in DCU

Victoria Pedretti

as Lois Lane in DCU

Denzel Washington

as Lucius Fox in DCU

Corey Hawkins

as Red Tornado in DCU

Mimi Slinger

as Amethyst Princess of Gemworld in DCU

Henry Simmons

as Steel in DCU

Mirtha Michelle

as The Question in DCU

Jonathan Majors

as Black Lightning in DCU

John Krasinski

as Second Blue Beetle in DCU

Jude Law

as Bro'Dee in DCU

Cary Elwes

as Alan Scott in DCU

Haaz Sleiman

as Simon Baz in DCU