To Kill A Mockingbird: Character Analysis of Jem Throughout life people go through changes. These changes can be brought on by events in a person's life, the need to adapt, adolescence, as well as other things. In the book To Kill a Mockingbird, by Harper Lee, many characters go through changes including Jem. He changes in his attitude, his beliefs, and his interests. Throughout the beginning of the book Jem plays and is on the same thought pattern with his younger sister, Scout. They play games with their friend Dill and get along well. But later in the book Jem begins to change. All the sudden he doesn't want to play with Scout anym