Suggestions by @gabrielbrancatte

Christian Bale

as Gil-Galad in The Silmarillion

Score: +3

Cole Sprouse

as Caranthir in The Silmarillion

Score: 0

Matthew McNulty

as Turgon in The Silmarillion

Score: +4

Emily Blunt

as Galadriel in The Silmarillion

Score: +5

Bryan Cranston

as Mandos in The Silmarillion

Score: +4

Mads Mikkelsen

as Elu Thingol in The Silmarillion

Score: +6

Christian Bale

as Húrin Thalion in The Silmarillion

Score: +7

Jarred Blakiston

as Fingon in The Silmarillion

Score: +2

Charlie Hunnam

as Tuor in The Silmarillion

Score: +5

Rebecca Ferguson

as Morwen in The Silmarillion

Score: +6

Cody Fern

as Sauron in The Silmarillion

Score: +11

Ian Somerhalder

as Fëanor in The Silmarillion

Score: -2

Cody Fern

as Fëanor in The Silmarillion

Score: +1

John Noble

as Glaurung in The Silmarillion

Score: -3

Cody Fern

as Morgoth in The Silmarillion

Score: 0

Tom Hiddleston

as Túrin Turambar in The Silmarillion

Score: 0

Henry Cavill

as Morgoth in The Silmarillion

Score: +1

Josh Duhamel

as Captain Atom in Animal Man

Score: +1

Alexander Skarsgård

as Thor Odinson in The Ultimates

Score: +2

Tyler Hoechlin

as Guts in Berserk

Score: -4