Cho Chang (b. 1978/1979) was a witch who attended Hogwarts School of Witchcraft and Wizardry from 1990-1997 and was sorted into Ravenclaw House. She was a Seeker for the Ravenclaw Quidditch team and a popular student. In Cho's fifth year, she began dating Cedric Diggory while he was a Champion in the Triwizard Tournament. Cedric became one of the first casualties of the Second Wizarding War. He was murdered by Peter Pettigrew on Lord Voldemort's order in June of 1995. His death greatly upset Cho and made her determined to fight against the recently returned Dark Lord.
In her fifth year, she joined Dumbledore's Army, an organisation taught and led by Harry Potter. In the same year she also began a romantic relationship with Harry. However, Cho and Harry's relationship fell apart after she betrayed the D.A. under Veritaserum. She was seemingly forgiven during her seventh year when she joined the D.A. to help participate in the Battle of Hogwarts.
Cho survived the Second Wizarding War and eventually married a Muggle.