When we first meet Scout, we see that she is a tough little girl, a veritable tomboy. In the beginning of chapter three, she is beating up Walter Cunningham. She would have continued, had Jem not broken up the fight. Even later in the book, there were times when Scout wanted to beat up other boys, but Atticus forbid her after this incident.
Catching Walter Cunningham in the schoolyard gave me some pleasure, but when I was rubbing his nose in the dirt Jem came by and told me to stop. “You’re bigger’n he is,” he said.
Scout is also curious. She has many questions, such as when she asks Calpurnia about what rape is.
By the end of the book, Scout matures greatly. In a conversation with Atticus, she says something profound. In fact, she even leads Atticus, when she makes the connection that Boo Radley is a mockingbird figure. Here is what the text says:
Atticus sat looking at the floor for a long time. Finally he raised his head. “Scout,” he said, “Mr. Ewell fell on his knife. Can you possibly understand?
Atticus looked like he needed cheering up. I ran to him and hugged him and kissed him with all my might. “Yes sir, I understand,” I reassured him. “Mr. Tate was right."
Atticus disengaged himself and looked at me. “What do you mean?” “Well, it’d be sort of like shootin‘ a mockingbird, wouldn’t it?”