Suggestions by @graviton55

William Moseley

as Jan Suk in Monster

Score: +1

Ken Watanabe

as The Mandarin in Iron Man 4

Score: -1

Mark Mothersbaugh

as Composer in Courage the Cowardly Dog

Score: +1

Julia Jentsch

as Margot Langer in Monster

Score: +3

Rutger Hauer

as General Wolf in Monster

Score: +2

Harry Shum Jr.

as Dr. Kenzo Tenma in Monster

Score: -3

Paloma Kwiatkowski

as Lotte Frank in Monster

Score: +4

Peter Donald Badalamenti II

as Otto Heckel in Monster

Score: +2

Jason O'Mara

as Richard Brown in Monster

Score: 0

Oliver Masucci

as Franz Bonaparta in Monster

Score: +6

Troy Gentile

as Karl Neumann in Monster

Score: +2

Rolf Hoppe

as Hans Georg Schuwald in Monster

Score: +4

Max Riemelt

as Dr. Rudi Gillen in Monster

Score: +6

Rob Reiner

as Dr. Julius Reichwein in Monster

Score: +1

Andreas Pietschmann

as Martin Reest in Monster

Score: +8

Ben Mendelsohn

as Wolfgang Grimmer in Monster

Score: +3

Elias Harger

as Dieter in Monster

Score: +3

Udo Kier

as Peter Capek in Monster

Score: +3

Brad Pitt

as Martin Reest in Monster

Score: +4

Warwick Davis

as The Baby in Monster

Score: +5