Boo Radley is very much like a mockingbird as in the begining of the book atticus said dont shoot mockingbirds because they do nothing to hurt anything or anyone. All they do is sing their hearts out. That statement is relateble to Boo because he has done nothing wrong. Boo saved Scouts and Jems life and thats a good deed and is a foot washing baptist. Boo does nothing to hurt others and thats why Boo relates to a mockingbird.
Tom Robinson is like a mockingbird because hes just a nice black man. Tom has done nothing to hurt anyone and if anyone needed help Tom was their to help them. Even though Tom had a limp arm he did everything to the best iof his abilitys and tryed his hardest on everything. But sadly Tom was taking advantage of by Mayella Ewell. She asked him for his help and accused him of rape. Thats why Tom is like a mockingbird.