Suggestions by @lord_adrian_richter

Ricky Nelson

as Dick Grayson in Marvel and DC of the 1950s

Score: +1

Alan Napier

as Alfred Pennyworth in Marvel and DC of the 1950s

Score: +2

Tommy Kirk

as Jimmy Olsen in Marvel and DC of the 1950s

Score: +1

Anne Francis

as Kara Zor-El in Marvel and DC of the 1950s

Score: +1

Sandra Dee

as Kara Zor-El in Marvel and DC of the 1950s

Score: +2

Kim Novak

as Kara Zor-L (Earth-Two) in Marvel and DC of the 1950s

Score: +1

Marilyn Monroe

as Harleen Quinzell in Marvel and DC of the 1950s

Score: +1

Vincent Price

as Viktor Fries in Marvel and DC of the 1950s

Score: +1

Yul Brynner

as Viktor Fries in Marvel and DC of the 1950s

Score: +2

Julie Newmar

as Selina Kyle in Marvel and DC of the 1950s

Score: +2

Eartha Kitt

as Selina Kyle in Marvel and DC of the 1950s

Score: +3

Telly Savalas

as Lex Luthor in Marvel and DC of the 1950s

Score: +2

Yul Brynner

as Lex Luthor in Marvel and DC of the 1950s

Score: 0

Audrey Hepburn

as Lois Lane in Marvel and DC of the 1950s

Score: +1

Caesar Romero

as Joker in Marvel and DC of the 1950s

Score: +1

Rhonda Fleming

as Shayera Hall in Marvel and DC of the 1950s

Score: +3

Yul Brynner

as Carter Hall in Marvel and DC of the 1950s

Score: +1

Chuck Connors

as Slade Wilson in Marvel and DC of the 1950s

Score: +1

Sophia Loren

as Diana Prince in Marvel and DC of the 1950s

Score: +1

Gregory Peck

as Bruce Wayne in Marvel and DC of the 1950s

Score: +3