Suggestions by @redgth

Jack Lemmon

as Hoban Washburn in Firefly

Score: +1

Anne Baxter

as Inara Serra in Firefly

Score: +1

Gloria Grahame

as Saffron in Firefly

Score: +1

Paul Newman

as Malcolm Reynolds in Firefly

Score: +1

Natalie Wood

as Kaylee Frye in Firefly

Score: -1

Dorothy Dandridge

as Zoe Washburn in Firefly

Score: +1

Tony Curtis

as Dr. Simon Tam in Firefly

Score: +1

Burt Lancaster

as Jayne Cobb in Firefly

Score: +1

Gene Kelly

as Fiyero in Wicked (1950s)

Score: +1

Kirk Douglas

as Odysseus in The Trojan War in Classic Hollywood (1950s)

Score: +1

Richard Burton

as Hector in The Trojan War in Classic Hollywood (1950s)

Score: +2

Bobby Driscoll

as Anakin Skywalker (child) in Star Wars Prequel Trilogy (1940's)

Score: +1

Bobby Driscoll

as Anakin "Ani" Skywalker in Star Wars: Episode I – The Phantom Menace (1949)

Score: +1

Audie Murphy

as Obi-Wan Kenobi in Star Wars: Episode I – The Phantom Menace (1949)

Score: +1

Peter Lorre

as Nute Gunray in Star Wars: Episode I – The Phantom Menace (1949)

Score: +2

Vincent Price

as Palpatine in Star Wars: Episode I – The Phantom Menace (1949)

Score: +1

Gregory Peck

as Qui-Gon Jinn in Star Wars: Episode I – The Phantom Menace (1949)

Score: +1

Buster Keaton

as Jar Jar Binks in Star Wars: Episode I – The Phantom Menace (1949)

Score: +1

Leo G. Carroll

as Finis Valorum in Star Wars: Episode I – The Phantom Menace (1949)

Score: +2

Elizabeth Taylor

as Padmé Amidala in Star Wars: Episode I – The Phantom Menace (1949)

Score: +1