Suggestions by @guineveresmith

Robin Lord Taylor

as Marv in Home Alone

Score: +1

Anthony Carrigan

as Harry in Home Alone

Score: +2

Ramin Djawadi

as Composer in Doctor who (series 14)

Score: -1

Murray Gold

as Composer in Inspector Morse

Score: +1

Stephen Tompkinson

as Chief Inspector Morse in Inspector Morse

Score: +1

Tom Ellis

as Lord Brett Sinclair in The Persuaders!

Score: +2

Ed Harris

as Capt. Frank McNeil in Kojak

Score: 0

Tom Mison

as Lord Brett Sinclair in The Persuaders!

Score: +1

Sylvester McCoy

as Dr. Max DeBryn in Inspector Morse

Score: 0

Colin Baker

as Chief Superintendent Strange in Inspector Morse

Score: +2

Idris Elba

as Chief Superintendent Moody in Inspector Lewis

Score: +1

Michelle Fairley

as Chief Superintendent Innocent in Inspector Lewis

Score: +1

Jemma Redgrave

as Dr. Laura Hobson in Inspector Lewis

Score: +1

Tom Mison

as Sergeant Hathaway in Inspector Lewis

Score: +1

Liam Neeson

as Inspector Lewis in Inspector Lewis

Score: +1

Stefanie Martini

as Dr. Laura Hobson in Inspector Morse

Score: +1

David McCallum

as Dr. Max DeBryn in Inspector Morse

Score: +1

Drew Powell

as Chief Superintendent Strange in Inspector Morse

Score: +3

Murray Gold

as Composer in Doctor Who

Score: +3

Liam Neeson

as The Terminator in The Terminator

Score: -4