It's clear that one can also consider Arthur "Boo" Radley a Mockingbird as well. But were they the only two? Since the very first sentence of the. To Kill a Mockingbird, novel by Harper Lee, published in The protagonist is Jean Louise (“Scout”) Finch, an intelligent though. One quickly realizes when reading To Kill a Mockingbird that Scout is who she is because of the way Atticus has raised her. He has nurtured her mind.