Cho Chang is a character from the Harry Potter series.
She was the girlfriend off Cedric Diggory, until his death. Afterwards she became the girlfriend of Harry Potter.
In her fifth year, Cho began dating Cedric Diggory, after he took her to the Yule Ball. Not much is known about their relationship, other than the fact that she was devastated after his death, and had a hard time the following year.
Cho Chang was Harry's first crush. He fell for her in his third year of Howarts. At first, Cho does not return these feelings for him. However, she still treats him with respect, by refusing to wear the "Potter Stinks shirts Malfoy made.
In Cho's sixth year, following Cedric's death, Harry comforts Cho, and the two kiss. The two then begin dating.
Cho, however, feels jealous of Harry's friendship with Hermione Granger, and eventually, their relationship falls apart after Cho's friend Marriette betrayed Dumbledore's Army to Dolores Umbridge.
It is later revealed that Cho Chang left Harry for Michael Corner. They date during her seventh year at Hogwarts.
During an interview with J.K. Rowling, she reveals that Cho eventually marries a muggle.