Suggestions by @wolferus

Jensen Ackles

as Deathstroke in Casting James Gunn's DCU! :D

Colin O'Donoghue

as Giovanni "John" Zatara in Casting James Gunn's DCU! :D

Charlie Rowe

as Kid Flash in Casting James Gunn's DCU! :D

David Mazouz

as Red Robin in Casting James Gunn's DCU! :D

Robert Carlyle

as Brother Blood in Casting James Gunn's DCU! :D

Bill Skarsgård

as Scarecrow in Casting James Gunn's DCU! :D

Damian Priest

as Trigon in Casting James Gunn's DCU! :D

Alan Ritchson

as Orion in Casting James Gunn's DCU! :D

Abubakar Salim

as Martian Manhunter in Casting James Gunn's DCU! :D

Abubakar Salim

as Black Manta in Casting James Gunn's DCU! :D

Manuel Alfonso Andrade Oropeza

as Bane in Casting James Gunn's DCU! :D

Keanu Reeves

as Deathstroke in Casting James Gunn's DCU! :D

Karl Urban

as Deathstroke in Casting James Gunn's DCU! :D

Sean Pertwee

as Alfred Pennyworth in Casting James Gunn's DCU! :D

Maxwell Jacob Friedman

as Booster Gold in Casting James Gunn's DCU! :D

Matt Letscher

as Reverse Flash in Casting James Gunn's DCU! :D

Wentworth Miller

as Captain Cold in Casting James Gunn's DCU! :D

Joe Anoa'i

as Lobo in Casting James Gunn's DCU! :D

Florence Pugh

as Athena in Percy Jackson & the Olympians

Jason Momoa

as Zeus in Percy Jackson & the Olympians