Suggestions by @nat_14123

Felix Sandman

as Nico di Angelo in Percy Jackson and the Hero's of Olympus

Score: +1

Caleb McLaughlin

as Leo Valdez in Percy Jackson and the Hero's of Olympus

Score: 0

Jaden Smith

as Grover Underwood in Percy Jackson and the Hero's of Olympus

Score: +1

Tanner Buchanan

as Frank Zhang in Percy Jackson and the Hero's of Olympus

Score: -2

Millie Bobby Brown

as Piper McLean in Percy Jackson and the Hero's of Olympus

Score: 0

Jace Norman

as Jason Grace in Percy Jackson and the Hero's of Olympus

Score: +1

Iain Armitage

as Percy Jackson in Percy Jackson and the Hero's of Olympus

Score: 0