Suggestions by @matthew05

Dylan O'Brien

as Booster Gold in Justice League International

Score: +4

Chimwemwe Miller

as Venom in New Voice Actors to Play Marvel and DC Characters

Score: +3

Djimon Hounsou

as Darkseid in Justice League International

Score: +3

Lily James

as Black Canary in Justice League International

Score: +6

Theo James

as Batman in Justice League International

Score: +4

Will Poulter

as Booster Gold in Justice League International

Score: +4

Chiwetel Ejiofor

as The Martian Manhunter in Justice League International

Score: +6

Glen Powell

as Batman in Justice League International

Score: +1

Abby Trott

as Mary Jane Watson in New Voice Actors to Play Marvel and DC Characters

Score: +2

Steven Ogg

as Clyde in Love and Monsters (Alternate Cast)

Score: +3

Lucas Till

as Cap in Love and Monsters (Alternate Cast)

Score: +2

Joaquin Phoenix

as Billy Costigan in The Departed (2006)

Score: +5

Christian Bale

as Billy Costigan in The Departed (2006)

Score: +6

Glen Powell

as Jeffrey Goines in 12 Monkeys

Score: +3

Aaron Paul

as Powerplex in Invincible

Score: +2

Jeremy Allen White

as Powerplex in Invincible

Score: +2

Jon Bernthal

as Omni-Man in Invincible

Score: +2

Sandra Oh

as Debbie Grayson in Invincible

Score: +2

Terry Crews

as The Mauler Twins in Invincible

Score: +1

Maude Apatow

as Shrinking Rae in Invincible

Score: +1