Stewart is a 13-year-old boy who is intellectually gifted but socially awkward. Despite Stewart’s odd appearance, he has a good heart. Initially, he welcomes the notion of a stepsister, even if she is someone as hostile as Ashley. Although Stewart originally attended a school for gifted children, he wants to blend into mainstream society and chooses to go to the nearby Borden Secondary School. While there, his slight physique draws the attention of bullies. Despite the harassment, Stewart tries to keep a positive attitude and remain optimistic.

He eventually finds his niche among students who are looked down upon by social elites like Ashley. The social outcasts like Stewart demonstrate compassion and empathy, which their social “superiors” fail to exhibit. Stewart’s integrity and kindness provide Ashley with a model for how people ought to treat each other. By the end of the novel, Stewart finally helps Ashley to change for the better.

Stewart is a dynamic character. Initially, he is fears Jared’s bullying and struggles to fit in. By the end of the novel, he stands up to Jared and has a group of supportive friends. He has become braver and more socially intelligent, like his stepsister.