She's probably ethnically Chinese, although the series doesn't specify (Rowling confusingly combined a Korean first name with a Chinese last name). Cho has a Scottish accent in the films, which would suggest she's a Chinese-Scottish person.
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Her real name is Cho Chang. The actress who played her is called Katie Leung.
Nobody killed Cho Chang, she survived the series. Cho later married an unnamed muggle man.
She is from Japan.
Yes she is.
The character's correct name is Cho (full name Cho Chang). Played by Katie Leung.