Aunt Alexandra works hard at being feminine, but Miss Maudie doesn't seem to care about those things. Without these necessary changes, the novel would not have the same impact on its readers.
The Cunninghams are not main characters in the book, but they are characters who 'brought out' other characters' personality The many points of discussion which surface in Lee's book would certainly have partially submerged the parallel she created between Tom Robinson and the mockingbird.
I was content to learn that Aunt Alexandra could be pierced sufficiently to feel gratitude for help given. Miss Maudie has a quiet spirituality that shows itself only when taunted by "'the foot-washers [who] think women are a sin by definition.
Miss Maudie, on the other hand, sets herself toward the outside of Maycomb's conventionality. His tolerance is shown especially in the town, when dealing with his kids and when talking to Aunt Alexandra. In to Kill a Mockingbird, by Harper Lee racism was the cause of much agony to the blacks of a segregated South.