Suggestions by @optimistic_writer

Timothy Spall

as Oswald Cobblepot in Bruce Wayne (2001-2007)

James Gandolfini

as Carmine Falcone in Bruce Wayne (2001-2007)

Clancy Brown

as Rupert Thorne in Bruce Wayne (2001-2007)

Chris Evans

as Detective James Gordon in Bruce Wayne (2001-2007)

Tom Baker

as Alfred Pennyworth in Bruce Wayne (2001-2007)

Bruce Campbell

as Shazam in DCEU (1990s)

CCH Pounder

as Amanda Waller in DCEU (1990s)

Bruce Willis

as Floyd Lawton in DCEU (1990s)

Roger Moore

as Alfred Pennyworth in DCEU (1990s)

Nicolas Cage

as Joker in DCEU (1990s)

Courtney Love

as Harleen Quinzel in DCEU (1990s)

Julianne Moore

as Mera in DCEU (1990s)

Sylvester Stallone

as Rick Flag in DCEU (1990s)

David Niven

as Alfred Pennyworth in Batman Universe (Late 70s-Early 80s)

Bruce Willis

as Deadshot in Batman Universe (Late 70s-Early 80s)

Michael Douglas

as Scarecrow in Batman Universe (Late 70s-Early 80s)

Mel Gibson

as Clayface in Batman Universe (Late 70s-Early 80s)

Ricardo Montalban

as Bane in Batman Universe (Late 70s-Early 80s)

Kyle MacLachlan

as The Riddler in Batman Universe (Late 70s-Early 80s)

Robin Williams

as Mad Hatter in Batman Universe (Late 70s-Early 80s)