Bob Ewell is not a normal person; he is a criminal that should be in prison for all the wrong doing he did. However, he is the innocent one in the situation and Mayella Ewell is the guilty.
Calpurnia feels that she has to behave in a certain way in front of certain people which reflects the influence people have on other innocent ones. Dolphus Raymond is a good example of a character that puts on a false faade but its not to hide his guilt.
As Scout loses this innocence she gains something more important: an understanding of society around her and a deeper understanding of moral values. Boo finally revealed himself to the children when he saved them from Bob Ewell trying to kill them.
Innocence in this novel comes in many forms from childhood innocence to moral goodness, but are the characters really innocent or are there faades put on to hide their guilt? Mrs Richards.
Atticus brought hope to the black people in the society and in the courtroom.