Suggestions by @gustavofring

Demogorgen

as Scarecrow in DC universe

Ferb Fletcher

as Fourth robin in DC universe

Kim Jong-un

as The joker in DC universe

Vladimir Putin

as The Batman in DC universe

Gaten Matarazzo

as Superman in DC universe

Mr. Beast

as Superman in DC universe

Grug

as Martian Manhunter in DC universe

Barack Obama

as Green Lantern. in DC universe

Gianni DeCenzo

as Superboy in DC universe

David Mazouz

as Superboy in DC universe

Djimon Hounsou

as Martian Manhunter in DC universe

John Boyega

as Martian Manhunter in DC universe

Mahershala Ali

as Martian Manhunter in DC universe

Chiwetel Ejiofor

as Martian Manhunter in DC universe

Idris Elba

as Martian Manhunter in DC universe

Damson Idris

as Martian Manhunter in DC universe

Eddie Redmayne

as Kal el in DC universe

Asa Butterfield

as Kal el in DC universe

Tony Amendola

as Professor strange in DC universe

Ben Kingsley

as Professor strange in DC universe