Suggestions by @aaronsamuels

Cesar Romero

as Joker in DC(E)U

Jack Nicholson

as Joker in DC(E)U

Jared Leto

as Joker in DC(E)U

Mark Hamill

as Joker in DC(E)U

Heath Ledger

as Joker in DC(E)U

Barry Keoghan

as Joker in DC(E)U

Joaquin Phoenix

as Joker in DC(E)U

Phil LaMarr

as Black Manta in DC(E)U

Kevin Michael Richardson

as Black Manta in DC(E)U

Yahya Abdul-Mateen II

as Black Manta in DC(E)U

Manu Bennett

as Deathstroke in DC(E)U

Joe Manganiello

as Deathstroke in DC(E)U

Mark Strong

as Sinestro in DC(E)U

Claudia Black

as Cheetah in DC(E)U

Kristen Wiig

as Cheetah in DC(E)U

Wentworth Miller

as Captain Cold in DC(E)U

Paul Bettany

as The Riddler in DC(E)U

Paul Dano

as The Riddler in DC(E)U

David Tennant

as The Riddler in DC(E)U

Leonardo DiCaprio

as The Riddler in DC(E)U