Suggestions by @jaistarkiller

Brenton Thwaites

as Roran Garrowson in Inheritance Cycle

Score: +1

Tanner Buchanan

as ERAGON in Inheritance Cycle

Score: -1

John Williams

as Composer in Inheritance Cycle

Score: -2

Peter Jackson

as Director in Inheritance Cycle

Score: +2

Ashley Greene

as Arya in Inheritance Cycle

Score: +2

Teyonah Parris

as Nasuada in Inheritance Cycle

Score: +1

Anne Hathaway

as Angela the Herbalist in Inheritance Cycle

Score: -1

Brenton Thwaites

as Roran in Eragon

Score: -9

Penélope Cruz

as Queen Islanzadí in Eragon

Score: 0

Anne Hathaway

as Angela in Eragon

Score: -1

Julia Roberts

as Saphira in Eragon

Score: -3

Ewan McGregor

as Brom in Eragon

Score: +9