5 suggestions

Luna Steeples
as Rachel Elizabeth Dare in Percy Jackson and the Olympians

Momona Tomada
as Silena Beauregard in Percy Jackson and the Olympians

Dallas Dupree Young
as Charles Beckendorf in Percy Jackson and the Olympians

Matilda Lawler
as Lorraine Jensen in The Pigman

Jacob Tremblay
as John Conlan in The Pigman