Harry Potter and the Sorcerer's Stone

Severus Snape is a fictional character in the Harry Potter book series written by J.K. Rowling. In the first novel of the series, he is hostile... toward Harry and is built up to be the primary antagonist until the final chapters. As the series progresses, Snape's character becomes more layered and complex. Rowling does not fully reveal the details of his true loyalties until the end of the final book, Harry Potter and the Deathly Hallows. Over the course of the series, Snape's portrayal evolves from that of a malicious and partisan teacher to that of a pivotal character of considerable complexity and moral ambiguity. Snape primarily teaches Potions at Hogwarts, though in the sixth novel he teaches Defence Against the Dark Arts, a position which he was known to have desired throughout the series. He ultimately becomes Headmaster of Hogwarts in the final novel. Rowling has described him as "a gift of a character". In an interview, Rowling described Snape's character as an "antihero".
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Rubeus Hagrid is a fictional character in the Harry Potter book series written by J. K. Rowling. Hagrid is introduced in Harry Potter and the... Philosopher's Stone as a half-giant who is the gamekeeper and Keeper of Keys and Grounds of Hogwarts, the primary setting for the first six novels. In the third novel Harry Potter and the Prisoner of Azkaban, Hagrid is promoted to Care of Magical Creatures teacher, and is later revealed to be also a member of the Order of the Phoenix. Hagrid was among the characters that Rowling says she created "the very first day". She has explained the source of his name as "another old English word, meaning — if you were hagrid — it’s a dialect word — you’d had a bad night. Hagrid is a big drinker — he has a lot of bad nights." In her article "Harry’s Fame", Rosemary Goring notes the Forest of Dean is an influence on Rowling’s work, and Hagrid is the only character that is "directly drawn from the Forest of Dean". According to Goring, Hagrid’s "dropped word-endings are a Chepstow speciality.
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Argus Filch is the caretaker in J. K. Rowling's Harry Potter series of books. While he does not act maliciously, and is not an evil character, he is... certainly both short- and ill-tempered, which has made him very unpopular with the student body. His knowledge of the secrets and shortcuts of the castle is nearly unparalleled. The only people who have known more were the Marauders and the Weasley twins. Filch owns a cat named Mrs. Norris to which he has a particular attachment; he frequently calls her "my sweet". She acts as a hallway monitor or spy for Filch: if she observes students engaging in suspicious activity, or out of bed after hours, Filch arrives in seconds. She has been known to follow Hagrid everywhere when he goes about to the school, apparently under Filch's orders. According to Rowling, there is nothing particularly magical about Mrs. Norris, other than her being "just an intelligent cat." The name "Argus" comes from Greek mythology, where it was the name of a giant with one hundred eyes who served the goddess Hera as a watchman .
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Professor Minerva McGonagall is a fictional character in the Harry Potter book series written by J. K. Rowling. During the series, she is Deputy... Headmistress, head of Gryffindor House, Transfiguration professor, and later Headmistress at Hogwarts School of Witchcraft and Wizardry, where she began teaching in December 1956. McGonagall considers Transfiguration to be amongst the most complex and dangerous magic taught at Hogwarts. McGonagall served as Headmistress of Hogwarts during Albus Dumbledore's absence from Hogwarts in Harry's second year, and briefly in the sixth book of the series. She acted as headmistress when the Heads of House decided the school would reopen, but before the 1997-98 school year commenced, Professor Severus Snape was appointed Headmaster on Voldemort￢ﾀﾙs orders. She remained a member of the Order of the Phoenix. She was later reappointed as Headmistress, but Rowling has stated that by the time of the epilogue in 2017 , she no longer held the position. Critical responses to the character vary.
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