Suggestions by @silmarils

Logan Lerman

as Robin in Teen Titans

Score: -4

Elliot Page

as Raven in Teen Titans

Score: -9

Zooey Deschanel

as Harley Quinn in Robins

Score: -2

Anthony Hopkins

as Oswald Cobblepot in Robins

Score: -1

Robert Carlyle

as Joker in Robins

Score: -6

Wes Bentley

as Salvatore Maroni in Robins

Score: 0

Jonathan Rhys Meyers

as Black Mask in Robins

Score: -3

David Anders

as Victor Zsasz in Robins

Score: +2

Stephen Fry

as Professor Pyg in Robins

Score: +2

John Noble

as Ventriloquist in Robins

Score: +1

Andy Serkis

as Mad Hatter in Robins

Score: +1

Kelsey Grammer

as Hugo Strange in Robins

Score: -1

Eric Bana

as Hush in Robins

Score: +1

Bradley Cooper

as Clayface in Robins

Score: -2

Elijah Wood

as Jonathan Crane in Robins

Score: 0

Stanley Tucci

as Victor Fries in Robins

Score: -2

Hugh Laurie

as Edward Nygma in Robins

Score: -1

Ewan McGregor

as Two-Face in Robins

Score: -1

Salma Hayek Pinault

as Selina Kyle in Robins

Score: -6

Alexander Siddig

as Rha's Al Ghul in Robins

Score: 0