Suggestions by @heroofolympus

Two-Face (Harvey Dent)

as Batman in Sinister Six for different Heroes

Clayface

as Batman in Sinister Six for different Heroes

Deathstroke (Slade Wilson)

as Batman in Sinister Six for different Heroes

The Joker (Character)

as Batman in Sinister Six for different Heroes

Carrie Coon

as Hawkgirl in DCU

Lucas Till

as Flash in DCU

Antony Starr

as Reverse Flash in DCU

Sam Worthington

as Captain Cold in DCU

Lily James

as Iris West in DCU

Jeff Bridges

as IRON MONGER in IRONMAN: Steel Nemesis

Gwyneth Paltrow

as RESCUE in IRONMAN: Steel Nemesis

Terrence Howard

as WAR MACHINE in IRONMAN: Steel Nemesis

Robert Downey Jr.

as IRONMAN in IRONMAN: Steel Nemesis

Sean Bean

as Thaddeus Thawne in DCU

Ana de Armas

as Meloni Thawne in DCU

Ed Harris

as Darryl Frye in DCU

Emma Thompson

as Joan Garrick in DCU

Dennis Quaid

as Jay Garrick in DCU

Luke Evans

as Sinestro in DCU

Henry Zaga

as Kyle Rayner in DCU