Suggestions by @nathavert3000

Emily Blunt

as Samus in Super Smash Bros Brawl

Score: +3

Tom Hardy

as Mario in Super Smash Bros Brawl

Score: 0

Morgan Freeman

as Master Qui-Gon in Star Wars: The Alternate Prequel Trilogy

Score: +1

John Noble

as Count Dooku in Star Wars: The Alternate Prequel Trilogy

Score: +1

Ian McDiarmid

as Sheev Palpatine in Star Wars: The Alternate Prequel Trilogy

Score: +11

Frank Oz

as Master Yoda in Star Wars: The Alternate Prequel Trilogy

Score: +4

Ewan McGregor

as Obi-Wan Kenobi in Star Wars: The Alternate Prequel Trilogy

Score: +9

Sean Bean

as Anakin Skywalker in Star Wars: The Alternate Prequel Trilogy

Score: -3