Suggestions by @lyns

Anson Mount

as John Marston in Red Dead Redemption 2

Score: +1

Roger Clark

as Arthur Morgan in Red Dead Redemption 2

Score: +2

Tom Hardy

as Arthur Morgan in Red Dead Redemption 2

Score: +2

Hayley Atwell

as Mary Linton in Red Dead Redemption 2

Score: +12

Nikki Reed

as Mary-Beth Gaskill in Red Dead Redemption 2

Score: -3

Stephen Graham

as Simon Pearson in Red Dead Redemption 2

Score: -3

Robert Carlyle

as Colm O'Driscoll in Red Dead Redemption 2

Score: 0