Suggestions by @realgunz

J.P. Manoux

as Egghead in Universe DCU

Andy Bean

as Black mask in Universe DCU

Tattiawna Jones

as Onyx in Universe DCU

Shaun Toub

as Ra's Al Ghul in Universe DCU

David Krumholtz

as Harvey Bullock in Universe DCU

Domhnall Gleeson

as Mad hatter in Universe DCU

Miriam Leone

as Poison ivy in Universe DCU

Paul Walter Hauser

as Professor Pyg in Universe DCU

James Gunn

as James Gunn in Universe DCU

Leah Sava Jeffries

as Ruthye in Universe DCU

Sophie Thatcher

as Supergirl in Universe DCU

Rottweiler

as Ace in Universe DCU

black pitbull

as Titus in Universe DCU

White Dog

as Krypton in Universe DCU

Camila Mendes

as Pandora in Universe DCU

Annalisa Cochrane

as Lady Amaya in Universe DCU

Rodrigo Santoro

as Nick Necro in Universe DCU

Rhys Coiro

as Trigon in Universe DCU

Jim Carrey

as The Mask in Universe DCU

Elizabeth Ludlow

as Keeya Adebayo in Universe DCU