I think it would be Scout. Scout would make a good lead alongside her father and her brother. Her views of her can start off in a very discriminatory way due to how she perceives the other culture living in the same area as her. She can see how people can treat others differently when it comes to color and culture. But throughout history, Scout has been able to understand and grow, she has learned that it's okay to be different. Her aunt and Tom Robinson's problem had made her understand better what is right and what is wrong in their society