As the previous post mentioned, the Finch family--father Atticus, his son, Jem, and his daughter and narrator, Scout--are the central figures of To Kill a Mockingbird. When Dill Harris arrives to visit Maycomb each summer, he becomes Scout's best friend and love interest. But narrowing down the main characters to five is a bit restrictive. The trial of Tom Robinson certainly becomes the central focus of the second half of the novel, but an equally important character who remains unseen until the end is the elusive Arthur "Boo" Radley. Rarely has any novel been so dependant upon a character who remains invisible until the final pages as TKAM does with Boo. Another important character is Bob Ewell, the evil racist used by author Harper Lee to tie together the main plots of Parts One and Two.
Scout Finch, Jem Finch, Dill, Atticus Finch and Tom Robinson.