Suggestions by @jackoreilly

Saxon Sharbino

as Karen Starr / Kara Zor-L in DCU Teen Titans

Charles Melton

as Terry McGinnis in DCU Bat Family

Mads Mikkelsen

as Vril Dox in DCU Superman Rogues

Brandon Routh

as Hank Henshaw in DCU Superman Rogues

Tom Welling

as Clark Kent in DCU Superman Rogues

Dolph Lundgren

as Mongol in DCU Superman Rogues

Chris Evans

as Eobard Thawne in DCU Legion of Doom

Glenn Howerton

as Eobard Thawne in DCU Legion of Doom

Geno Segers

as Bane in Matt Reeves' The Batman Trilogy

Adrian Brody

as The Joker in Casting James Gunn's DCU! :D

Nicholas Alexander Chavez

as Red Hood in Casting James Gunn's DCU! :D

Henry Cavill

as Bizarro in Casting James Gunn's DCU! :D

Ariana Greenblatt

as Crush in Casting James Gunn's DCU! :D

Sandra Bullock

as Lara Lor-Van in Casting James Gunn's DCU! :D

Dylan Sprayberry

as Superboy in Casting James Gunn's DCU! :D

Reneé Rapp

as Leslie Willis in DCU Superman Rogues

Elle Fanning

as Siobhan McDougal in DCU Superman Rogues

Diane Kruger

as Faora Hu-Ul in DCU Superman Rogues

Sam Worthington

as John Corben in DCU Superman Rogues

Martin Short

as Mr Mxyzptlk in DCU Superman Rogues