Harry Potter and the Half-Blood Prince

Ronald Bilius "Ron" Weasley is a fictional character and one of the three main protagonists of J. K. Rowling's Harry Potter series. His first... appearance was in the first book of the series, Harry Potter and the Philosopher's Stone as the best friend of Harry Potter and Hermione Granger. He is a member of the Weasley family, a pure blood family, who reside in "The Burrow" outside Ottery St. Catchpole. Along with Harry and Hermione, he is a member of the Gryffindor house. Ron is present in most of the action throughout the series due to his friendship with Harry. According to J. K. Rowling, Ron was among the characters she created "the very first day". Ron is inspired by Rowling's best friend Sean Harris , but she has clearly stated that she "never set out to describe Sean in Ron, but Ron has a Sean-ish turn of phrase." Like Harris is to Rowling, Ron is "always there" when Harry needs him.
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Luna Lovegood is a fictional character in the Harry Potter book series written by J. K. Rowling. The character first appears in Harry Potter and the... Order of the Phoenix, in which she is described as having straggly, waist-length dirty-blond hair and a dazed look on her face. Her eyes are "silvery", "misty", and "protuberant" . The character is portrayed by Irish actress Evanna Lynch in the film adaptation of Harry Potter and the Order of the Phoenix. On her website, Rowling described the actress as "perfect" for the role. Lynch had to bleach her hair a light blonde colour in order to play the role, and it has been confirmed that she will reprise the role in Harry Potter and the Half-Blood Prince. Rowling has often said that Luna is the "anti-Hermione", as Luna believes things on faith alone, while Hermione grounds her views on facts and logic. Hermione repeatedly tries to convince Luna that her beliefs are nonsense, but to no avail. This is not to suggest that Luna is unintelligent; indeed, as a Ravenclaw, it is her belief that "wit beyond measure is man's greatest treasure".
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Cho Chang is a fictional character in J. K. Rowling's Harry Potter book series. She is a Ravenclaw student and a year older than Harry. She is... described as being a short, very pretty girl with long, shiny dark hair. She's very popular as she always seems to be followed by a large group of girl friends. Cho plays Seeker for the Ravenclaw Quidditch team, and her favorite professional Quidditch team is the Tutshill Tornadoes. Cho's Patronus is also revealed to be a swan. Her name seems to imply Chinese or Korean descent. She first appeared in the third book, Harry Potter and the Prisoner of Azkaban, when the Gryffindor team played the Ravenclaw Quidditch team, but did not become as prominent a character until the fourth book, Harry Potter and the Goblet of Fire, as Harry's first crush and in the fifth book, Harry Potter and the Order of the Phoenix, as his first girlfriend. Cho was played by Katie Leung in the fourth Harry Potter film, Goblet of Fire and she reprised the role in the fifth movie, Order of the Phoenix.
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Hermione Jean Granger is a fictional character and one of the three main protagonists of J. K. Rowling's Harry Potter series. She initially appears... in the first novel, Harry Potter and the Philosopher's Stone, as a new student on her way to Hogwarts. After Harry and Ron save her from a mountain troll in the girls' bathroom, she becomes close friends with them and often uses her quick wit, deft recall, and encyclopaedic knowledge to help them. Rowling has stated that Hermione resembles her at a younger age, with her insecurity and fear of failure. Hermione is a Muggle-born Gryffindor student, and the best friend of Harry Potter and Ron Weasley. Rowling states that she was born on 19 September 1979 and she was nearly twelve when she first attended Hogwarts. She is an overachiever who excels academically, and is described by Rowling as a "very logical, upright and good" character. Rowling adds that Hermione's parents, two Muggle dentists, are a bit bemused by their odd daughter but very proud of her all the same." They are well aware of the wizarding world and have visited Diagon Alley with her.
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