Suggestions by @tomprophet

Ice Cube

as Sweet Johnson in GTA San Andreas

Score: +11

Kyle Massey

as Big Smoke in GTA San Andreas

Score: -9

Keiynan Lonsdale

as Carl Johnson in GTA San Andreas

Score: -6

Lorene Scafaria

as Director in GTA San Andreas

Score: -4

Donald Glover

as Rio in Jem and the Holograms

Score: 0

Hayley Williams

as Stormer in Jem and the Holograms

Score: +1

Adore Delano

as Roxy in Jem and the Holograms

Score: +2

Ashley French

as Pizzazz in Jem and the Holograms

Score: +2

Dara Reneé

as Shana in Jem and the Holograms

Score: +3

Madelaine Petsch

as Kimber in Jem and the Holograms

Score: +2

Hayley Kiyoko

as Aja in Jem and the Holograms

Score: +1

Kim Petras

as Jem = Jerrica Benton in Jem and the Holograms

Score: +1

Matty Cardarople

as Gerint in Mabinogion

Score: +1

Daniel Howell

as Peredur in Mabinogion

Score: +1

Iwan Rheon

as Owain in Mabinogion

Score: +1

Asa Butterfield

as Rhonabwy in Mabinogion

Score: +1

Taron Egerton

as King Arthur in Mabinogion

Score: +1

Kristian Nairn

as Ysbaddaden in Mabinogion

Score: +1

Sadie Soverall

as Olwen in Mabinogion

Score: +4

Frank Turner

as Kilhwch in Mabinogion

Score: +1