Scout represents a child-like innocence. She is a young girl and through the book her experiences expose her to evil in the world. She also represents how children respond to traumatic situations.
Represents how judgmental people can be when they don't know anything about a person. They make assumptions based on what they see not what they know is a fact.
His pocket watch represents the honorable standards and morals Atticus hopes to pass down to his family. Just like the watch is being passed down through the family. He wants the Finches to be different from the world in how they view and treat people.