Suggestions by @manurm

Christopher Lloyd

as Vin in Jak and Daxter

Score: +2

Steve Buscemi

as Tym in Jak and Daxter

Score: +1

Freddie Highmore

as Seem in Jak and Daxter

Score: +2

Angela Lansbury

as Onin in Jak and Daxter

Score: +1

Johnny Depp

as The Sculptor in Jak and Daxter

Score: +2

Julia Roberts

as Mary Vanderboom in Rusty Lake: Roots

Score: +4

Ethan Hawke

as James Vanderboom in Rusty Lake: Roots

Score: +4

Kate Winslet

as Emma Vanderboom in Rusty Lake: Roots

Score: +6

Donald Sutherland

as William Vanderboom in Rusty Lake: Roots

Score: +3