A young wizard who survived a deadly curse as a baby. This encounter left him with a lightning-shaped scar on his forehead. He lives with his non-magical relatives during the summer and feels deeply isolated from his friends. He acts bravely to defend others but struggles with self-doubt regarding his magical abilities.

Harry’s tall, red-haired best friend, coming from a large but impoverished magical family. He struggles to define himself among his many successful older siblings. He acts impulsively but provides steadfast moral support to his friends when they face challenges at school.

An exceptionally intelligent and assertive witch born to non-magical parents. She studies rigorously and acts as the group's social conscience. She typically adheres closely to the rules but willingly breaks them to solve mysteries and combat prejudice.

A handsome, wildly famous celebrity author who takes the post of Defense Against the Dark Arts teacher at Hogwarts. Vain and obsessed with his public image, he frequently dispenses unsolicited advice and acts as an unwelcome mentor to Harry.

The exceptionally wise and eccentric headmaster of Hogwarts. Known for his long beard and crooked nose, he serves as a moral and academic authority who demonstrates profound tolerance and remains steadfastly fair during the escalating attacks.

A charming former Head Boy possessing high intelligence. His living memory is preserved in a blank diary. He attended Hogwarts fifty years earlier when the Chamber of Secrets was last opened and uses the diary to interact with students in the present day.

An evil wizard who went into hiding after his killing curse mysteriously rebounded off baby Harry a decade ago. He holds highly prejudiced beliefs about magical supremacy and remains a looming threat over the wizarding world.

A small house-elf with prominent eyes and ears who serves a wizarding family. Bound to unpaid servitude and forced to wear rags, he exhibits conflicting tendencies between his ingrained obedience and an independent desire to protect Harry Potter from impending danger.

Ron's younger sister, a first-year student at Hogwarts who harbors a strong crush on Harry. She spends much of her first term appearing stressed, awkward, and deeply disturbed by the frightening events occurring at the school.

The extraordinarily large, friendly gamekeeper at Hogwarts. Having been expelled in his youth, he is forbidden from doing magic but occasionally bends the rules. He possesses a dangerous fondness for fearsome magical creatures and serves as a confidant to Harry and his friends.

Harry’s wealthy, arrogant rival in Slytherin House. He holds deep-seated prejudices against Muggles and Muggle-borns, openly cheering when the Chamber of Secrets is opened. He flaunts his family's wealth, easily buying his way onto the Slytherin Quidditch team.

Draco’s wealthy, influential father who believes strongly in the superiority of "pureblood" wizards. He leverages his money and status to manipulate the Hogwarts board of governors and openly despises those who associate with non-magical people.

Ron's father, who works for the Misuse of Muggle Artifacts Office. He is deeply fascinated by Muggle technology, enchanting a Ford Anglia as a hobby, and strongly opposes the elitist prejudices held by families like the Malfoys.

The matriarch of the Weasley family. She is a warm, hospitable, but fiercely strict mother who keeps her chaotic household running smoothly while treating Harry as one of her own.

Harry’s non-magical uncle, a man obsessed with appearances, normalcy, and conformity. He detests magic, strictly forbidding it in his house, and resorts to physically locking Harry in his room to prevent any further disruptions to his middle-class life.

Harry’s aunt, who is obsessed with keeping her home perfectly normal and spotless. She openly favors her son Dudley and continuously punishes Harry, deeply resenting his connection to the wizarding world.

Harry’s spoiled, bullying cousin who enjoys mocking Harry's isolation. He is terrified of magic after previous encounters and uses his parents' favoritism to his advantage.

A moody, highly sensitive ghost who haunts an out-of-order women's restroom at Hogwarts. She frequently cries and takes offense easily, isolating herself in the plumbing where she was killed fifty years prior.

The disagreeable, harsh Potions teacher at Hogwarts. He acts as an antagonist among the faculty, harboring a deep dislike for Harry and actively seeking opportunities to see him expelled.

The strict but fair Transfiguration professor and head of Gryffindor House. She upholds the school's rules rigorously but worries genuinely for her students' safety during the escalating attacks.

Ron's older brother, a rules-oriented and ambitious Gryffindor prefect. He frequently disciplines his younger siblings and acts highly secretive about his personal life during the school year.

One of Ron's older twin brothers. He is a mischievous prankster and a Beater on the Gryffindor Quidditch team, frequently bending the rules for fun.

Fred's twin brother, sharing his penchant for rule-breaking and practical jokes. He plays Beater on the Gryffindor Quidditch team and happily flouts authority.

An excitable first-year Gryffindor student from a Muggle family. He is starstruck by Harry and constantly follows him around taking pictures before becoming one of the Petrified victims.

A friendly, Muggle-born Hufflepuff boy. He becomes terrified of Harry after a misunderstanding at the Dueling Club, believing Harry to be a dark wizard, and is later attacked.

The resident ghost of Gryffindor Tower. He is sensitive about his partially severed head and invites Harry to his five-hundredth deathday party to boost his social standing among other ghosts.

The Minister of Magic who frequently bows to political pressure. He arrests Hagrid not out of certainty of his guilt, but to appear as though the Ministry is doing something about the crisis.

An ancient, giant, horse-sized spider raised by Hagrid fifty years ago. He leads a massive colony of spiders in the forest and respects Hagrid, but holds no such loyalty to Hagrid's friends.

Dumbledore's loyal pet phoenix, a magical bird capable of bursting into flame and being reborn from the ashes. His tears possess immense healing powers.

One of Draco Malfoy's bulky best friends. He follows Draco's lead unquestioningly and is easily tricked by a simple trap involving spiked treats.

Draco Malfoy's other hulking companion. He serves as muscle for Draco and falls victim to a sleeping potion disguised as a treat.