Suggestions by @vincentwilliamsiii

Christopher Nolan

as Director in Aquaman I

Patty Jenkins

as Director in Wonder Woman I

Zack Snyder

as Director in Superman II (Superman/Batman)

Eva Mendes

as Adeline Kane in Deathstroke I

Liev Schreiber

as John Lynch in Deathstroke I

Martin Freeman

as Alfred Pennyworth in Batman II (Batman & Robin)

Denzel Washington

as Lucius Fox in Batman II (Batman & Robin)

Jon Hamm

as James “Jim” Gordon in Batman II (Batman & Robin)

Seth Green

as Jarvis Tetch in Batman II (Batman & Robin)

James McAvoy

as Harvey Dent in Batman II (Batman & Robin)

George Clooney

as Slade Wilson in Batman II (Batman & Robin)

Jon Bernthal

as Floyd Lawton in Batman II (Batman & Robin)

Brittany Daniel

as Erin Mckillen in Batman II (Batman & Robin)

Leonardo DiCaprio

as Salvatore Maroni in Batman II (Batman & Robin)

Nicolas Cage

as Carmine Falcone in Batman II (Batman & Robin)

Sadie Sink

as Barbara Gordon in Batman II (Batman & Robin)

Jesse Eisenberg

as Edward Nygma in Batman II (Batman & Robin)

Tom Hiddleston

as Joker in Batman II (Batman & Robin)

Tula

as Tula Marius in Aquaman I

Rooney Mara

as Lara Lor-Van in Superman I