Suggestions by @rover

Christian Bale

as Voldemort in Harry potter

Score: +1

Michael Caine

as Dumbledore in Harry potter

Score: +2

louis patridge

as Harry potter in Harry potter

Score: +2

David Thewlis

as Jim gordon in Batman

Score: 0

Michael Caine

as Alfred in Batman

Score: -1

Scarlett Johansson as Catwoman

as Catwoman in Batman

Score: +1

Brad Pitt

as Batman in Batman

Score: -2

Margot Robbie

as Posion ivy in Batman

Score: +1

Jack Black

as Mr penguin in Batman

Score: +1

Gary Oldman

as Two face in Batman

Score: 0

Will Smith

as Mr freeze in Batman

Score: 0

Dave Bautista

as Bane in Batman

Score: +1

The Joker (Willem Dafoe)

as Joker in Batman

Score: +3

Brad Pitt

as Bruce Wayne in Batman

Score: -21

Bailee Madison

as Sam larusso in Cobra Kai Recast

Score: +1

Steve Carell

as Gru in Despicable Me

Score: +1

Danny Trejo

as El Macho in Despicable Me

Score: +1

Paul Dano

as Vector in Despicable Me

Score: -1