Cho Chang

Cho Chang (Chinese: 张秋) is a Ravenclaw student one year above Harry, and plays Seeker for the Ravenclaw Quidditch team. She is best known for being Harry's first kiss. She is described as being "very pretty" with long dark hair and is frequently accompanied by a group of giggling Ravenclaw girls.
In Goblet of Fire, Harry's crush on Cho intensifies and he works up the courage to ask her out to the Yule Ball, but Cho apologises and replies that she had previously accepted Cedric Diggory's offer, leaving Harry to ignore his own date, Parvati Patil, and jealously obsess about the couple for nearly the entire length of the ball. Nonetheless, Cho is still kind to Harry; much to his relief, she refuses to wear one of Malfoy's "Potter Stinks" badges. She and Cedric maintain their relationship until his murder by Peter Pettigrew during the Third Task of the Triwizard Tournament.
Cho is one of the first students to believe Harry's declaration of Voldemort's return in Order of the Phoenix, and when invited by Hermione to join the D.A., Cho reveals that her parents wish her not to take part in any anti-Ministry relations, but she joins because she is determined to fight against Voldemort and avenge Cedric's murder. Cho initiates a kiss with Harry after the last D.A. session before the Christmas holidays; much to Ron's amusement, Harry describes the kiss as "wet," but then explains that Cho was crying. Harry and Cho go out on a date on Valentine's Day, but her sustained grief over Cedric's death, her ill-founded jealousy over Harry's friendship with Hermione, and Harry's lack of knowledge about girls all make for a miserable experience. Their relationship is damaged after the outing, and it ends permanently when Dumbledore's Army is exposed following Marietta's betrayal of the group to Umbridge. Cho defends her friend's actions by saying that Marietta simply made a mistake, and labels Hermione's secret anti-treachery jinxing of the group's list of names a "dirty trick". On the train back to Kings Cross, Ginny reveals that Cho was dating Michael Corner.
However, in the series finale, Cho demonstrates her loyalty to Hogwarts when she returns to join other D.A. members in hiding in the Room of Requirement prior to engaging in the final battle; Harry and Cho, united by a common cause, appear on amicable and friendly terms. She shares with Harry the little information known about Ravenclaw's diadem (one of Voldemort's Horcruxes), and offers to escort Harry to the Ravenclaw common room to search for clues, but Ginny hurriedly suggests that Luna take Harry up instead. Rowling revealed during an October 2007 book signing that Cho had married a Muggle.[5]
Katie Leung played Cho in Goblet of Fire, and in both the film and video game versions of Order of the Phoenix and Half-Blood Prince