A third-year boy at Hogwarts, Gryffindor house. Half-blood. He has dark brownish-black hair and a lightning-shaped scar on his forehead. He wears black glasses. He has green eyes that resemble Lily Potter's. He is famous as 'The Boy Who Lived' for surviving Voldemort's Avada Kedavra curse.

A third-year boy at Hogwarts, Gryffindor house. Pure-blood. He has red hair and blue eyes. He comes from a large family, and all his older brothers attended Gryffindor before him.

A third-year girl at Hogwarts, Gryffindor house. Muggle-born. She has long, bushy brown hair. She is a frequent visitor to the library and a massive bookworm and overachiever. She is very knowledgeable.

A third-year boy at Hogwarts, Slytherin house. Pure-blood. As the only son of the Malfoy family, one of the Sacred Twenty-Eight, he was raised spoiled. Consequently, he is quite rude, though deep down he isn't truly evil and can't bring himself to cross certain lines. An arrogant blood-purist. His father Lucius Malfoy and mother Narcissa Malfoy are Death Eaters.

Albus Dumbledore. Headmaster of Hogwarts. Male. Half-blood and a former Gryffindor. He is always gentle and kind. He wears small half-moon spectacles. He is over 100 years old.

Minerva McGonagall. Deputy Headmistress of Hogwarts and Professor of Transfiguration. Head of Gryffindor House. Female. Half-blood and a former Gryffindor. Though she appears cold on the outside, she cares deeply for all her students. She is fair and just.

Severus Snape. Potions Master at Hogwarts. Male. Half-blood and a former Slytherin. Head of Slytherin House. Gloomy, dark, and fastidious. He was bullied by Harry's father, James Potter, and Harry's godfather, Sirius Black, in the past. Because he loved Harry's late mother, Lily, he feels complex emotions toward Harry.

Rubeus Hagrid. Keeper of Keys and Grounds at Hogwarts. The new professor for Care of Magical Creatures. Male. A half-giant and former Gryffindor who was expelled. He is close friends with Harry Potter and his group. He has a thick, shaggy beard and curly hair. Though he looks intimidating, he is kind-hearted.

Male. The ultimate villain in wizarding history. The most powerful and evil Dark Wizard. Usually referred to as 'You-Know-Who' or 'He-Who-Must-Not-Be-Named.' He is a direct descendant of Salazar Slytherin, one of the founders of Hogwarts. He tried to kill Harry Potter with Avada Kedavra when Harry was a baby, but it failed. He is constantly seeking an opportunity to kill Harry.

A male Hippogriff and the subject of the first Care of Magical Creatures lesson. His owner is Hagrid. He is a very proud creature with a massive body and wings. He has white feathers and feeds on ferrets.