Could you jot down some characers that mirror each other?As in, Mr. Underwood and Boo Radley mirror each other becauase they hide from people and things in their "Maycomb County World."
ATTICUS & MISS MAUDIE. Miss Maudie and Atticus are very similar. They are strong, intelligent and opinionated but humble. Both try to impress upon Jem and Scout a proper way of living and to be respectful of others.
MR. UNDERWOOD & BOO RADLEY. Boo hides in the house but keeps an eye on the neighborhood at night when no one is watching. Underwood views Maycomb from the second floor of his office and voices his opinions via his newspaper.
MISS STEPHANIE & AUNT ALEXANDRA. Miss Stephanie is the town gossip who has something to say about everyone. Aunt Alexandra rates a close second, and lords her "gentle breeding" above most of the other townspeople.
SHERIFF TATE & REVEREND SYKES. Both are leaders of their people: Tate enforces the law in Maycomb, while Rev. Sykes is one of the forces of the black community.
DILL & DOLPHUS RAYMOND. Dill comes from an unhappy home and lives a fantasy life in his stories to Jem and Scout. Mr. Raymond is scorned by the white community and pretends to be something that he is not. Dill is happy in Maycomb, away from his parents; Mr. Raymond is happy fooling people with his own games and living on the "black side of town."
I don't know if you want to count the animals in Harper Lee's novel To Kill a Mockingbird as characters, too, but if so, there are a few more parallels.
One parallel is pretty obvious. At the trial, Bob Ewell is likened to a rooster (beak-like nose, strutting gait, reddish complexion, etc.) and thus he resembles the leader of the bunch of chickens that scratch out a living in the Ewells' yard.
Another parallel strikes me as very odd but interesting. Tom Robinson is described by Scout at the trial as seeming lopsided and, if we are to believe the guards toward the end of the novel, he rushes furiously and irrationally toward the prison fence before being shot dead. Those details establish a strange parallel between Tom Robinson and the mad dog.
Also, in their treatment of animals, Jem comes to mirror Dill. At the end of chapter 1, Jem talks about lighting a match under a turtle, an action that Dill calls hateful. Later in the novel, it's Scout who acts cruelly toward a roly-poly and it's Jem who chastises or challenges her.
A final parallel is probably the most widely accepted one in the novel, that between Tom Robinson and Boo Radley. Both are seen as "innocent" mockingbirds and both, paradoxically, are done away with in the story. One is imprisoned and shot dead, the other returned to the confines of his home until his death.