Suggestions by @sichalmers

Hikari Mitsushima

as Android 18 in Dragon Ball Z live action adaptation

Score: +1

Christoph Waltz

as Lord Frieza in Dragon Ball Z live action adaptation

Score: -1

Ryan Potter

as Son Gohan (adult) in Dragon Ball Z live action adaptation

Score: +2

Andrew Koji

as Prince Vegeta in Dragon Ball Z live action adaptation

Score: +2

Idris Elba

as Piccolo Jr. in Dragon Ball Z live action adaptation

Score: +3

Lewis Tan

as Son Goku in Dragon Ball Z live action adaptation

Score: +1

Angela Bassett

as Storm in Marvel Comics X-Men (1990s live action adaptation)

Score: +1

Geena Davis

as Rogue in Marvel Comics X-Men (1990s live action adaptation)

Score: +1

Anthony Hopkins

as Professor X in Marvel Comics X-Men (1990s live action adaptation)

Score: +1

Kurt Russell

as Wolverine in Marvel Comics X-Men (1990s live action adaptation)

Score: -1

Christopher Lee

as Magneto in Marvel Comics X-Men (1990s live action adaptation)

Score: +2

Young Natalie Portman

as Shadowcat in Marvel Comics X-Men (1990s live action adaptation)

Score: +1