Suggestions by @dippy2

Destin Daniel Cretton

as Director in Flash: Move Forward

Michael Mando

as Captain Boomerang in Flash: Move Forward

Marvin Jones III

as Girder in Flash: Move Forward

Jacob Batalon

as Chester P. Runk in Flash: Move Forward

Zendaya

as Ivy West Rusell in Flash: Move Forward

Chris Hemsworth

as Aquaman in Flash: Move Forward

Sadie Sink

as Rita Farr in Flash: Move Forward

Jon Bernthal

as Vigilante in Flash: Move Forward

Lewis Pullman

as Flash in Flash: Move Forward

Sterling K. Brown

as Blade in My Marvel Cinematic Universe

Don Lee (Ma Dong-seok)

as Kalibak in New Gods

Brett Goldstein

as Hawkman in Wonder Woman: Love and Truth

Daniel Brühl

as Maxwell Lord in Batman: Injustice

Scarlett Johansson

as Black Canary in Batman: Injustice

Jeremy Renner

as Green Arrow in Batman: Injustice

Lewis Pullman

as Flash in Batman: Injustice

Chris Evans

as Superman in Batman: Injustice

Jon Hamm

as Batman in Batman: Injustice

Timothée Chalamet

as Red Hood in Batman: Injustice

Joss Whedon

as Director in Justice League: The Amazo Virus