Suggestions by @jloggains91

Stephen Lang

as Rogal Dorn in The Horus Heresy

Score: -1

Michael Fassbender

as The Emperor of Mankind in The Horus Heresy

Score: +1

Kristofer Hivju

as Bjorn The Fellhanded in The Horus Heresy

Score: +1

Dar Salim

as Ahriman in The Horus Heresy

Score: +1

Jeremy Irons

as Malcador The Sigilite in The Horus Heresy

Score: +2

Austin Butler

as Fulgrim in The Horus Heresy

Score: -1

Joel Edgerton

as 1st Captain Typhus in The Horus Heresy

Score: +1

Andy Serkis

as Erebus in The Horus Heresy

Score: -2

Dave Bautista

as Perturabo in The Horus Heresy

Score: +1

Keith David

as Vulkan in The Horus Heresy

Score: +2

Anthony Hopkins

as Malcador The Sigilite in The Horus Heresy

Score: 0

Henry Cavill

as Constantine Valdor in The Horus Heresy

Score: +1

Mark Strong

as Lorgar Aurelian in The Horus Heresy

Score: +1

James Purefoy

as Luthor in The Horus Heresy

Score: +1

Lain Glen

as Lion El'Johnson in The Horus Heresy

Score: +1

Clancy Brown

as Mortarion in The Horus Heresy

Score: +1

Ron Pearlman

as Ferrus Manus in The Horus Heresy

Score: +1

Ian McKellen

as Malcador The Sigilite in The Horus Heresy

Score: -2

Gary Oldman

as Malcador The Sigilite in The Horus Heresy

Score: -2

Mads Mikkelsen

as Konrad Kurze in The Horus Heresy

Score: -1