Suggestions by @helawitnuri

Karl Urban

as The Batman in What If the DCEU was like the MCU?

Michael Fassbender

as Harvey Dent in Batman: Year One (2008)

Bruce Willis

as Lex Luthor in DCEU RECAST

Michael B. Jordan

as Cyborg in Green Arrow Movie / Limited Series

Taron Egerton

as Red Hood in Green Arrow Movie / Limited Series

Sterling K. Brown

as John Stewart in Green Lantern Corps

Bradley Cooper

as Harold "Hal" Jordan in HBO Max Green Lantern

Sterling K. Brown

as John Stewart in HBO Max Green Lantern

Andrew Garfield

as Dick Grayson in Batman: The Perfect Movie

Elijah Wood

as Jervis Tetch in Batman: The Perfect Movie

Katheryn Winnick

as Black Canary in Green Arrow Movie / Limited Series

Keanu Reeves

as Deathstroke in Green Arrow Movie / Limited Series

Charlie Hunnam

as Oliver Queen in Green Arrow Movie / Limited Series

Winona Ryder

as Barbara Minerva in Wonder Woman: The Lies

Brad Pitt

as Jim Gordon in Batman: The Telltale Series

Allison Williams

as Selina Kyle/Catwoman in Batman: The Telltale Series

Olivia Wilde

as Diana Prince in Wonder Woman: The Lies

Alfred Molina

as The Penguin in Batman

Dane DeHaan

as The Scarecrow in Batman

Johnny Depp

as The Joker in Batman