My favorite character was Miss Maudie because she seemed like the nice old lady that lived down the street. She really was a good person and shared Scout's distaste of tea parties and did not take part in the discriminatory gossip of her lady acquaintances.
My least favorite character would have to be either Mrs. Dubose, the evil morphine addict or Bob Ewell. But everyone hates him anyway. I used to really dislike Aunt Alexandria at first but she seemed really empathic at the end.
I was also a bit angry with Mayella but I got over it when I realized and accepted that she lied to the court to protect herself from her father. <img src='/images/emoticons/smiley5.png'>
All in all, it's a great book, not my favorite, but among the most important. It shows us how useless institutions like a court of law becomes in the hands of a prejudiced society. All the evidence quite clearly pointed towards Tom's innocence but there was no justice done by the court. But in the end Bob got what he deserved.
It makes us look back at our ancestors and feel shame. More shame than when you have sex on a table/play children's card games.