Jem had the most notable and consistent changes throughout the novel. Although he wasn't the main character his process of maturing was one of the most important aspects of understanding the theme. A moment at the climax of the novel that exemplifies his change from a naive child with a narrow worldview to a more realized individual is when he is knocked unconscious trying to protect his sister, “He was up like lightning and pulling me up with him but, though my head and shoulders were free, I was so entangled I did get very far. We were nearly to the road when I felt Jems hand leave me, felt him jerk backward to the ground.” (Lee, 301). At the beginning of the novel Jem was enthralled with senseless rumors like Boo Radley and displays it for the town to see. He even got to the point of almost getting himself shot trying to peek into the Radleys' house. He was easily angered and only saw the beginnings of deeper meanings behind some of the actions of the town. Later on, Jem starts to become less easily angered when Atticus takes the Tom Robinson case and they start to receive backlash from the town. Jem understands the importance of keeping a level head, besides Ms. Dubose, when people insult them where Scout is unable. At the trial, Jem constantly holds out hope that the town will make the right decision and is crushed when Tom Robinson is found guilty. This led to the discussion between him and scout about boo Radley not leaving the house because of the people outside.
Atticus stayed the most consistent throughout the entire novel. By design, Atticus was supposed to be the reliable and unwavering source of wisdom for Scout and Jem. A moment that shows how he's stayed the same throughout the novel is when he believes Jem killed Bob Ewell in self-defense and prepares to have him go to court, “‘of course, it was clear cut self-defense, but I'll have to go to the office and hunt up-’”(Lee, 313). He treated them and spoke to them as adults from the beginning of the novel, explaining to them complex ideas like entailments and elaborating when they needed it. The theme of Atticus acting and treating his family the same as he does in public carries throughout the entirety of the novel and when Jem and Scout are attacked he treats the situation the same way he would have if it was anyone. This highlights his reliability as a character and his cons for all his pros.