Harry is a 13-year-old wizard who is famous throughout the wizarding world for surviving an attack by the dark wizard Lord Voldemort when he was an infant. He has jet-black hair, round glasses, and a distinctive lightning-bolt scar on his forehead. Having lived most of his life with his non-magical, cruel relatives, Harry views Hogwarts School of Witchcraft and Wizardry as his true home. As he enters his teenage years, he resents the constant surveillance and protection imposed by the adults around him.

Ron is a 13-year-old wizard with flaming-red hair, a long nose, and a freckled face. He comes from a large, loving, but impoverished wizarding family and often relies on hand-me-downs, including his old pet rat. He is intensely loyal to Harry and stands by him through dangerous situations, though he can be stubborn when he feels wronged.

Hermione is a Muggle-born witch recognized as the cleverest student in her year. She has bushy brown hair and an intense dedication to her education. For her third year, she takes on an inexplicably heavy course load that leaves her exhausted. She prioritizes safety and rules, which sometimes creates friction with her more rebellious friends.

Professor Lupin is the newly appointed Defense Against the Dark Arts teacher at Hogwarts. He appears perpetually ill and exhausted despite his youth. He quickly proves to be an incredibly competent educator, giving his students practical, hands-on lessons that build their confidence in fighting dark creatures.

Sirius Black is an infamous prisoner who recently achieved the impossible by escaping from the heavily guarded wizard prison, Azkaban. Described in the media as a mass murderer and a former follower of Lord Voldemort, his escape places both the magical and Muggle worlds on high alert. The authorities believe he is determined to track down Harry Potter.

Snape is the Potions master and head of Slytherin house at Hogwarts. He has a thin, sallow face, a large nose, and greasy hair. He holds a deep, historical resentment toward Harry and is visibly furious that the Defense Against the Dark Arts post—a job he actively desires—was given to someone else.

Hagrid is the massive gamekeeper at Hogwarts who has recently been promoted to the post of Care of Magical Creatures teacher. He possesses a deep affection for dangerous animals. His confidence in his new teaching role is quickly shaken following an accident during his very first lesson.

Malfoy is a wealthy, vindictive Slytherin student and Harry's primary rival at school. He possesses a strong sense of entitlement and eagerly exploits any opportunity to get Harry or his friends into trouble, often utilizing his father's influence to terrorize school staff.

Professor McGonagall is the deputy headmistress of Hogwarts and head of Gryffindor house. She adheres closely to school rules, firmly denying Harry access to Hogsmeade without a proper guardian's signature, though she remains genuinely concerned for her students' safety.

Aunt Marge is Vernon Dursley's sister. She is a loud, deeply unpleasant woman who routinely bullies Harry. Her vicious insults regarding Harry's deceased parents eventually provoke a massive, accidental magical reaction from him.

Uncle Vernon is Harry's Muggle uncle and reluctant guardian. He despises magic and attempts to suppress any magical ability out of Harry by treating him poorly and demanding he pretend to be a student at a facility for criminal boys.

Fudge is the Minister of Magic, serving as the highest authority in the British wizarding government. He treats Harry with unexpected leniency regarding his accidental underage magic, demonstrating how deeply concerned the Ministry is about the current security threat.

Mr. Weasley is Ron's father and an employee at the Ministry of Magic. He is kind but firmly believes that Harry has a right to know about the dangers he faces, serving as a rare adult who speaks to the young wizard with complete honesty.

Mrs. Weasley is Ron's mother. She is fiercely protective of her entire family and views Harry as an unofficial son. She argues that the truth about the escaped convict would unnecessarily terrify the boy.

Professor Trelawney is the dramatic, deeply superstitious Divination teacher at Hogwarts. She eagerly predicts tragedy and doom for the sake of theatrics, particularly zeroing in on Harry to forecast his violent death using tea leaves.

Dumbledore is the wise, highly respected headmaster of Hogwarts. He is forced to permit terrifying prison guards to station themselves around the school grounds for security reasons, though he expresses clear distaste for their presence.

Fred is one of Ron's older brothers. Known for mischief and rule-breaking, he and his twin George possess an intimate knowledge of the castle's secret passageways and gladly share their illicit resources with Harry.

George is Ron's older brother. Along with his twin Fred, he serves as a source of humor and rebellious assistance for Harry, providing him with the tools necessary to sneak into nearby villages undetected.

Crookshanks is Hermione's giant orange cat. He takes an immediate, aggressive dislike to Ron's rat, creating severe strain between the friend group as he constantly hunts the small rodent.

Scabbers is Ron's old, hand-me-down pet rat. He appears increasingly sickly and terrified, constantly fleeing from Hermione's new cat and struggling to survive the escalating household tension.

Neville is an extremely forgetful and historically underestimated Gryffindor boy. He lacks confidence and is deeply terrified of Professor Snape, though he shows potential when guided by supportive teachers.

Buckbeak is a proud hippogriff—a magical half-horse, half-eagle creature. He is easily offended and quick to defend his pride, landing in serious legal trouble when a student disrespects him.

Peter Pettigrew is a historical figure to Harry, known as a former friend of James Potter. According to official accounts, he confronted Sirius Black after the Potters' murder and was blown to pieces, leaving only a finger behind.