Suggestions by @luciuscantin

Charles Gordone

as Owen Lars in Star Wars: Cartoon Version (1978)

Score: +1

Philip Michael Thomas

as Red Leader in Star Wars: Cartoon Version (1978)

Score: +1

June Foray

as Princess Leia in Star Wars: Cartoon Version (1978)

Score: +1

Mel Brooks

as Captain Antilles in Star Wars: Cartoon Version (1978)

Score: +1

Jim Thurman

as Luke Skywalker in Star Wars: Cartoon Version (1978)

Score: +1

Kenny Baker

as R2D2 in Star Wars: Cartoon Version (1978)

Score: +1

James Earl Jones

as Darth Vader in Star Wars: Cartoon Version (1978)

Score: +1

Anthony Daniels

as C-3PO in Star Wars: Cartoon Version (1978)

Score: +2