Harry Potter is the main character of the JK Rowling novels Harry Potter. Harry is known as the boy who lived after surviving a deadly attack when he was a child and a scar was left on his forehead. We follow Harry through his years at Hogwarts and him saving the world. A good Harry Potter, Halloween costume involves a Gryffindor robe, wand, scar and glasses. All those components make a great Harry Potter costume!