Name two characters that could be considered mockingbirds in "To Kill a Mockingbird"
I don't have my Mockingbird book with me, but the title of the book is referenced in a chapter right after Jem and Scout receive their guns from Uncle Jack for Christmas. They are out shooting and talking to Miss Maudie, and informs her that Atticus said they could shoot anything but mockingbird. Miss Maudie explains that mockingbirds do nothing but make beautiful music for people to listen to. They don't cause problems for people, so there is no reason to shoot them; therefore, it would be a sin.
Several people in this book can be considered mockingbirds. The obvious ones are Tom Robinson and Boo Radley. Tom only tried to help Mayella--never hurt her or anyone else--but the Ewell family is still trying to "shoot" him, and eventually he does end up dying because of their actions. Boo Radley simply tries to save Jem and Scout at the end of the book, and Heck Tate does not want to push him into the limelight or put him to trial because he's never done anything to hurt anyone. It's Scout that points this out.
You can make an argument for Atticus, Jem and Scout, and Mayella being mockingbirds as well.