Suggestions by @jasminepink

Bruce Timm

as Producer in Batman (1999)

Danny Elfman

as Composer in Batman (1999)

David Cronenberg

as Director in Batman (1999)

Gary Oldman

as Commissioner Gordon in Batman (1999)

Willem Dafoe

as Joker in Batman (1999)

Dennis Quaid

as Harvey Dent in Batman (1999)

Ian McKellen

as Alfred Pennyworth in Batman (1999)

Jim Caviezel

as Batman in Batman (1999)

Kaya Scodelario

as Lois Lane in Superman

Tye Sheridan

as Jimmy Olsen in Superman

Corey Stoll

as Lex Luthor in Superman

Henry Cavill

as Clark Kent in 2000's Justice League

Charlie Hunnam

as Arthur Curry in 2000's Justice League

Jake Gyllenhaal

as Barry Allen in 2000's Justice League

Megan Gale

as Diana Prince in 2000's Justice League

Robert Pattinson

as Bruce Wayne / Batman in DC Reboot

Brandon Flynn

as Barry Allen / The Flash in DC Reboot

John Krasinski

as Green Lantern / Hal Jordn in DC Reboot

Cobie Smulders

as Diana Prince / Wonder Woman in DC Reboot

Henry Cavill

as Clark Kent / Superman in DC Reboot