Suggestions by @davidrolsson

Steve Buscemi

as Salo in The Sirens of Titan

Score: +1

Margot Robbie

as Montana Wildhack in Slaughterhouse-Five

Score: +1

Jon Bernthal

as Cody in Steelheart

Score: +1

Kathryn Prescott

as Megan Tarash in Steelheart

Score: -2

Luke Evans

as Steelheart in Steelheart

Score: +2

Adewale Akinnuoye-Agbaje

as Abraham in Steelheart

Score: +1

Justice Smith

as David Charleston in Steelheart

Score: -2

Justin Theroux

as Billy Pilgrim in Slaughterhouse-Five

Score: +2

Justin Trudeau

as Billy Pilgrim in Slaughterhouse-Five

Score: -4

Sunny Pawar

as Chrono in The Sirens of Titan

Score: +1

Jamie Chung

as Beatrice Rumfoord in The Sirens of Titan

Score: +1

Rupert Grint

as Stony Stevenson in The Sirens of Titan

Score: +1

Marque Richardson

as Boaz in The Sirens of Titan

Score: +1

Robert Downey Jr.

as Winston Niles Rumfoord in The Sirens of Titan

Score: 0

Rahul Kohli

as Malachi Constant in The Sirens of Titan

Score: +1