Other that living on the same street, what do Boo Radley, Atticus and Mrs.Dubose all have in common? what larger message is supported by examination of these three characters?

I think all three characters serve as positive examples to both the children and the town. They have different personalities than the standard Maycomb status quo. While Atticus's gifts are more obvious, Boo and Miss. Dubose have gifts and traits that most people do not or rather choose not to comprehend.