Suggestions by @joe_mcsqueezy

Jim Cummings

as Kraid in Metroid

+1-0Score: +1

Viola Davis

as Mother Brain in Metroid

+1-1Score: 0

Charlie Adler

as Ridley in Metroid

+3-1Score: +2

Jodie Turner-Smith

as Samus Aran in Metroid

+2-2Score: 0

Kristen Schaal

as Bowser Jr. in Super Mario Bros. (All-Star Cast)

+4-1Score: +3

Kimiko Glenn

as Princess Daisy in Super Mario Bros. (All-Star Cast)

+3-3Score: 0