Suggestions by @blanepollino

Corey Stoll

as Horus Lupercal in Warhammer 40K

Sterling K. Brown

as Magnus the Red in Warhammer 40K

Andy Serkis

as Mortarion in Warhammer 40K

Chris Evans

as Roboute Guilliman in Warhammer 40K

Tom Hardy

as Angron in Warhammer 40K

Jon Bernthal

as Ferrus Manus in Warhammer 40K

Bradley Cooper

as Sanguinius in Warhammer 40K

Tom Hiddleston

as Konrad Curze in Warhammer 40K

Tadanobu Asano

as Jaghatai Khan in Warhammer 40K

Josh Brolin

as Rogal Dorn in Warhammer 40K

Chris Hemsworth

as Leman Russ in Warhammer 40K

Simu Liu

as Jaghatai Khan in Warhammer 40K

Vincent D'Onofrio

as Perturabo in Warhammer 40K

Lee Pace

as Fulgrim in Warhammer 40K

Karl Urban

as Lion El'Johnson in Warhammer 40K

Ana de Armas

as The Perpetual Erda in Warhammer 40K

Henry Cavill

as The Emperor of Mankind in Warhammer 40K