Suggestions by @harrypotter4ever

Emma Watson

as Princess Amarinda in The Ascendance Book Series

Score: +1

Logan Lerman

as King Jaron in The Ascendance Book Series

Score: +1

Alex Lange

as Will Solace in Heroes of Olympus

Score: +1

Alex Pettyfer

as Jason Grace in Heroes of Olympus

Score: +2

Phoebe Tonkin

as Clarisse La Rue in Heroes of Olympus

Score: +2

Adelaide Kane

as Reyna Avila Ramrez-Arellano in Heroes of Olympus

Score: +2

Kaya Scodelario

as Thalia Grace in Heroes of Olympus

Score: +1

Lily Collins

as Rachel Elizabeth Dare in Heroes of Olympus

Score: +1

Zendaya

as Piper McLean in Heroes of Olympus

Score: -1

Caitlin Stasey

as Calypso in Heroes of Olympus

Score: +2

Jessica Sula

as Hazel Levesque in Heroes of Olympus

Score: +1

Claire Holt

as Annabeth Chase in Heroes of Olympus

Score: +1

Benjamin Wadsworth

as Leo Valdez in Heroes of Olympus

Score: +1

Ki Hong Lee

as Frank Zhang in Heroes of Olympus

Score: +2

Amandla Stenberg

as Hazel Levesque in Heroes of Olympus

Score: +1

Amanda stenburg

as Hazel Levesque in Heroes of Olympus

Score: +1

Skandar Keynes

as Nico Di Angelo in Heroes of Olympus

Score: +1

Amandla Stenberg

as Hazel Levesque in Heroes of Olympus

Score: +1

Ariana Grande

as Piper McLean in Heroes of Olympus

Score: -2

Natalie Alyn Lind

as Calypso in Heroes of Olympus

Score: -1