The protagonist is the outlier. He has no center because he doesn't know who he is. He plays tricks to get attention, not out of malice, but out of a desperate need to be seen . His arc is the film's thesis: You cannot protect what you love until you know who you are.
The film creates a fascinating metaphysical system based on . Rise of the Guardians
But Jamie, a boy of boundless optimism, refuses to give up. When Jack Frost, at his lowest point, reveals himself to Jamie, the boy doesn't scream. He stares in awe and whispers, "You are real." The protagonist is the outlier