Who is jack will

Jack Will is Auggie's best friend. Mrs. Palacio writes, "Jack is a wonderful kid. He's not perfect. He's not sensitive like Summer is, but he knows what's right and wrong. He's not the kind of kid who thinks a lot about the things he does or its impact on others, but he's good-hearted. And courageous. He's the kind of person who will protect the underdogs of the world."