Suggestions by @alantiedman

Cory Michael Smith

as Riddler in The Legion of Doom (DCEU)

Andrew Scott

as Lex Luthor in The Legion of Doom (DCEU)

Michael Fassbender

as Reverse Flash in The Legion of Doom (DCEU)

Cameron Monaghan

as The Joker in The Legion of Doom (DCEU)

Finn Wittrock

as Nightwing/Dick Grayson in The Robins

Gina Carano

as Giganta in Batman and Superman: Public Enimies

Vincent D'Onofrio

as Solomon Grundy in Batman and Superman: Public Enimies

Sean Bean

as Mongul in Batman and Superman: Public Enimies

Idris Elba

as Black Lightning in Batman and Superman: Public Enimies

James McAvoy

as Captain Atom in Batman and Superman: Public Enimies

Charles Dance

as Alfred Pennyworth in Batman and Superman: Public Enimies

Scott Adkins

as Bruce Wayne/Batman in Batman and Superman: Public Enimies

Andrew Scott

as Lex Luthor in Batman and Superman: Public Enimies

Derek Theler

as Hawkman in Batman and Superman: Public Enimies

Taron Egerton

as Jason Todd/Red Hood in The Robins

Finn Wittrock

as Nightwing in The Robins

Taron Egerton

as Red Hood in The Robins

David Zayas

as Maroni in The Killing Joke

Charles Dance

as Alfred in The Killing Joke

Scott Adkins

as The Batman in The Killing Joke