Suggestions by @djakblue2006

Jaden Smith

as Miles Morales in Spider-Man Sinister 6 (2010's)

Score: -1

China Anne McClain

as Brianna in On The Come Up

Score: +2

Will Smith

as Carl Carlson in The Simpsons

Score: +4

Ariana Grande

as Marge Simpson in The Simpsons

Score: -23

Gabriel Iglesias

as Jeffrey Albertson in The Simpsons

Score: -7

Pierce Gagnon

as Bart Simpson in The Simpsons

Score: -11

Dakota Lotus

as Bart Simpson in The Simpsons

Score: -9

Dakota Lotus

as Charles Montgomery Burns in The Simpsons

Score: -27