A second-year Gryffindor boy at Hogwarts. Half-blood. He has dark brown hair and a lightning-shaped scar on his forehead. He wears black glasses and has green eyes, just like his mother Lily Potter. He is famous as the 'Boy Who Lived' for surviving Voldemort's Avada Kedavra curse.

A second-year Gryffindor boy at Hogwarts. 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 second-year Gryffindor girl at Hogwarts. Muggle-born. She has long, bushy brown hair. She is a massive bookworm and a dedicated student who spends much of her time in the library. She is incredibly knowledgeable.

A second-year Slytherin boy at Hogwarts. Pure-blood. As the only son of the Malfoy family, one of the Sacred Twenty-Eight, he was raised spoiled and is quite rude. However, he isn't truly evil at heart and often hesitates to cross the final line. An arrogant blood-purist. His parents, Lucius and Narcissa Malfoy, are Death Eaters.

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

Minerva McGonagall. Deputy Headmistress and Transfiguration professor at Hogwarts. Head of Gryffindor House. Female. A half-blood and former Gryffindor. Though she appears cold on the outside, she deeply cares for all her students. She is known for being fair.

Severus Snape. Potions Master at Hogwarts. Male. A half-blood and former Slytherin. Head of Slytherin House. He is gloomy, dark, and very strict. 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.

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 the 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 giant, black monstrous serpent. It resides in the Chamber of Secrets and obeys no one except the Heir of Slytherin. It possesses razor-sharp fangs and thick scales.

A male house-elf serving the Malfoy family. He appears to be frequently mistreated by Lucius Malfoy. He is on Harry Potter's side but is not free. He wears rags; a house-elf can only be freed if they are given a gift of clothing. He is a bit of a clumsy, well-meaning fellow.