!!Atticus Finch

An attorney, member of the state legislature, and father of Scout and Jem. Known for his skill with a rifle. He defends a black man named Tom Robinson who is accused of rape, and is referred to by his children by his first name, rather than "Dad" or "father".

* BadassBookworm: As a lawyer, words are his stock in trade.
* BadassPacifist: He sits outside the jailhouse unarmed to defend Tom Robinson from a lynch mob, and the defense he gives in the courtroom definitely counts.
* CrusadingLawyer: The town's not mad that Atticus was ''assigned'' to defend a black man. The problem is, ''he's actually doing the job properly'', which is tantamount to treason in the racist Deep South.
* DeadpanSnarker
* DeterminedDefeatist: Knows full well that the [[CommonNonsenseJury racist jury]] will never acquit Tom Robinson, even if all evidence points to his innocence. He gives his all in defending him anyway.
* DoesNotLikeGuns: Despite his skill, he will only use a gun when absolutely necessary. His kids don't even know that he's capable of wielding a gun until he has to put down a rabid dog.
* {{Expy}}: Atticus' character was based upon Harper Lee's father.
* GentlemanAndAScholar
* TheHero[=/=]{{Deuteragonist}}: Though the book is from Scout's 1st-person perspective, he's probably the real main character.
* KnightInSourArmour: Takes a dim view of the trial, but stays at it anyway.
* NiceGuy: A compassionate true gentleman and a kind-hearted father.
* PapaWolf
* ProBonoBarter: He accepts foodstuffs from the Cunninghams because they can't afford the fees and are too proud not to pay.
* RetiredBadass: Used to be a good sharpshooter. He also won't join the father's football team with the excuse that he's too old.
* SimpleCountryLawyer: Averted. Atticus is a brilliant lawyer, and also very ethical.

!!Jean Louise "Scout" Finch

The narrator and protagonist of the novel.

* AuthorAvatar: She's just like Harper Lee was as a little girl.
* BoyishShortHair: In the movie (her hair length is not mentioned in the book, only that she has bangs).
* CharacterDevelopment: The book is a coming-of-age story for her.
* DecoyProtagonist: It is told from her point-of-view, but since she's a kid, she's more of a witness to events.
* MissingMom: Her mother died when she was two. Jem remembers her but Scout doesn't.
* PluckyGirl
* SesquipedalianLoquaciousness: How she narrates the story.
* {{Tomboy}}: Especially by 1930's standards, anyway. She doesn't like dresses, she plays with boys, and considers "you act like a girl" an insult.
* TomboyishName: Prefers being called Scout.
* WideEyedIdealist: Being just a child and all. She doesn't really understand why the lynch mob is at the jail house, only that they might hurt her father, and disarms them by talking to Mr. Cunningham.

!!Jeremy "Jem" Finch

Scout's older brother.

* BigBrotherBully: He acts like this towards Scout pretty often.
* BigBrotherInstinct: Yet when they're attacked at the end of the book, he does everything possible to protect her. Which isn't much, given how young he is, but he still screams at her to run and tries to pull her to safety.
* DisproportionateRetribution: He thinks so: Being forced to read to the repulsive old lady who insulted his mother while she goes into withdrawal from morphine because he cut up her flowers. In reality, he is being taught an important lesson about respect and bravery.
* InnocenceLost: More so than Scout, as Jem understands more of the social issues in his community and has a hard time meshing those racist values with people he grew up liking and respecting. Also, his belief in the legal system is shattered after the trial.
* JerkWithAHeartOfGold
* MissingMom
* ScarsAreForever: Not "scar" as such, but the very first sentences of the book describe how Jem's arm was broken close to the elbow, which made it noticably shorter than it should be from then on. [[spoiler:It happens in the climax of the book.]]

!!Calpurnia "Cal"

Housekeeper of the Finch family and strict mother figure to Scout and Jem. Despite being black, she is able to read and write, and is the one who taught Scout to read and write.

* KindlyHousekeeper: She treats Scout and Jem like her kids. Granted, it means disciplining them sometimes.
* MamaBear: She may not be their mom, but that doesn't stop her from protecting Scout and Jem.

!!Charles Baker "Dill" Harris

An intelligent and imaginative boy whom Jem and Scout befriend. His carefree attitude hides his inner pain over his parents' divorce and his mother's alcoholism.

* BrilliantButLazy
* {{Cloudcuckoolander}}
* DarkAndTroubledPast
* DeadpanSnarker: The most cynical character in the story by far.
* DisappearedDad: He keeps inventing different reasons why his dad's not around.
* {{Expy}}: For Harper Lee's friend, Truman Capote.
* InsufferableGenius
* LargeHam: Is said to act this way when he plays villains in Jem and Scout's games.
* ScrewThisImOuttaHere: In the movie after attempting to get close to Boo Ridely's house and knocking on his door. He, Jem, and Scout make a break for it and hide around a nearby house. Dill quickly tells the two "see ya next summer" and takes off.

!!Nathan Radley

The old father of Arthur "Boo" Radley who imprisoned his son in their house for years.

* AbusiveParents
* DisproportionateRetribution: The aforementioned imprisonment of his son was because [[spoiler:Boo fell in with the wrong crowd and took part in a joy ride. Once.]]
* TheFundamentalist

!!Arthur "Boo" Radley

A quiet and reclusive young man and neighbor to the Finches. He is almost never let out of his house and is a mysterious figure to Maycomb, often leading to rumors of just who he is.

* BigDamnHeroes: At the end of the book.
* DarkIsNotEvil
* TheDreaded: Jem, Scout, and Dill are terrified of him, to the point where just touching the Radley house is an act of great bravado.
* TheGhost: Initially until the final part of the book.
* GoodAllAlong: Jem and Scout start to realize this when Boo leaves them gifts in the knot-hole of the tree.
* HollywoodPersonalityDisorders: Schizoid Personality Disorder in his case.
* MadmanInTheAttic: The town has a lot of different stories about why Boo is locked up, such as that he once stabbed his father with a pair of scissors.
* MissingMom
* MisunderstoodLonerWithAHeartOfGold: Former TropeNamer.
* NotEvilJustMisunderstood
* PapaWolf: Kills Bob Ewell when he tries to murder Atticus' children.
* ShrinkingViolet: While forced into reclusion by his father (or likely because of this), Boo is still very quiet and unsure around others. {{Discussed}} by Sheriff Tate, that Boo would likely find the mass attention of others overwhelming.
* SocialServicesDoesNotExist: No one intervened when Boo's father imprisoned him at home for years on end.

!!Maude "Maudie" Atkinson

Another neighbor of the Finches and childhood acquaintance of Atticus. Whenever Scout has no one to talk to, she usually talks with Maudie. She also loves baking Lane cakes.

* CoolOldLady: Wins a [[AsTheGoodBookSays quote-off]] with some Bible-thumpin' fundamentalists that criticize her vibrant garden.
* DistaffCounterpart: Scout occasionally compares her wisdom to her father's.
* GrayEyes
* NatureLover: Spends all of her time out in her garden.
* ThePollyanna: Even after her house burns down, she still mainly talks about how much bigger she'll make her garden be for her next house.
* TitleDrop: "Remember, it's a sin ''to kill a mockingbird.''"

!!Robert E. Lee "Bob" Ewell

Main antagonist of the novel. Accuses Tom Robinson of raping his daughter Mayella and successfully lands him in jail.

* AbusiveParents: Physically abuses Mayella, and it's strongly implied that he sexually abuses her as well.
* BigBad: Or as close as you can get in the book -- his actions set the plot into motion and heavily impact the main characters.
* CorruptHick: ''Oh yeah.'' Racist, impoverished, [[spoiler:possibly sexually abusive of his own daughter]], and spending his few welfare checks on alcohol.
* DirtyCoward: He won't confront the best marksman in town, but he will [[spoiler:try to kill his children while they're walking home in the dark]].
* DisproportionateRetribution: What motivates him throughout the novel, such as when he tries to break into a judge's house.
* EvilIsPetty: Sometimes yes. Sometimes ''not''.
* IronicName: He's ''really'' not worthy of being named after Robert E. Lee.
* {{Jerkass}}
* KickTheDog: Harassing Tom Robinson, and even after his conviction and death, stalks and harasses his widow as well.
* LowerClassLout
* NamedAfterSomebodyFamous: Robert E. Lee
* ThePigPen
* PoliticallyIncorrectVillain: To the point where ''Robert E. Lee himself'' would be turning in his grave if he heard such a lout bore his name.
* ASinisterClue: Atticus points out in court that Mayella's injuries were caused by someone left-handed. Like her dad.
** Technically, Ewell's ambidextrous (can use "one hand as good as the other"), but given that the defendant ''can't'' use their left hand....
* TheSociopath: He's an abusive father with no concern for his family, he threatens anyone who rubs him the wrong way, he forces his daughter to falsely accuse her friend of rape, [[spoiler:and he tries to murder Atticus' children]].
* StupidEvil
* VillainWithGoodPublicity: Subverted: Everyone knows that Ewell is a total slime. He only wins against Tom because he is white in a backwards Southern town. And the trial only reveals more unsavory facts, driving him into his vengeful rampage later in the book.
* [[spoiler:WouldHurtAChild]]

!!Mayella Ewell

Accuser of being raped by Tom Robinson.

* AllOfTheOtherReindeer
* AssholeVictim: Debatably. She's from a pretty messed-up family and isn't a nice person at all, but it's possible she's only like this ''because'' of her father.
* BrokenBird: Her life has very little good in it. When Atticus addresses her with basic courtesy, she thinks he's mocking her.
* FriendlessBackground: She is too busy trying to control/care for her many siblings and trying (but failing) to keep their home clean that she has no friends. Part of the reason as to why she came onto Tom, as he was the only person who did not treat her badly because she was "trash", and was friendly to her.
* MissingMom: Became a ParentalSubstitute to her siblings after Mrs. Ewell died.
* PromotedToParent: [[spoiler:After Boo kills her father to protect Scout and Jem. This is actually a promotion in every sense of the word, considering how awful Mr. Ewell was.]]
* SocialServicesDoesNotExist: No one intervenes to help the Ewell family, despite its many problems. Justified, as social services would have been underdeveloped at the time the novel takes place.
* TraumaCongaLine: Mayella's life has been one long procession of pain. She loses her mother at a young age, endures physical (and possibly sexual) abuse from her father, lives in poverty and squalor, struggles to raise her siblings alone, has no friends, and is an outcast because of her "white trash" background. After she comes onto Tom, the only person who showed her kindness, her father forced her to falsely accuse Tom of rape.
* WoobieDestroyerOfWorlds

!!Tom Robinson

Black man accused of raping and assaulting Mayella Ewell. His left arm is crippled, which becomes a vital point in his trial. Despite Atticus's efforts, he is found guilty and imprisoned.

* NiceGuy: He was one of the only people who treated Mayella with kindness, and pitied her even as she ruined his life.
* RedRightHand: Averted; it's actually a plot point that his left hand is damaged beyond repair. Mayella's injuries were from a left-handed assailant.
* ScaryBlackMan: Averted big-time; he's a fairly intimidating guy, but has a gentle soul.
* SuicideByCop: One way of perceiving [[spoiler:his death.]]
* TooGoodForThisSinfulEarth