- Beat out over 3,000 girls to make her debut as "Cho Chang" in Harry Potter and the Goblet of Fire (2005).
- According to her father, she had never been in a school play and went for the audition "on a whim"..
- Author J.K. Rowling insisted that the actress to play "Cho" had to be a complete unknown.
- Favorite actor is Joaquin Phoenix.
- She can speak fluent English and Cantonese and a little bit of Mandarin.
- Attended Hamilton College, a prestigious private school in Hamilton, Scotland. Since finishing school in May 2005, Katie wants to either study art at university or embark on an acting career.
- Has two brothers (one named Jonathan) and a younger sister (Violet)
- Parents are Kar Wai Li & Peter Leung (divorced)
- Her favorite Chinese actors are Aaron Kwok and Stephen Chow.
- Values her brother, Jonathan's, opinions most
- Was pregnant with her son Wolf on the set of Annika (2021). So the story had to be slightly reworked to accommodate her pregnancy.
- Lives in London and Scotland.
- When filming the Cho and Harry kiss scene, she didn't realise they would only use lips to kiss, and so used tongue on the first take, thoroughly stunning Daniel Radcliffe.
- When voice acting for the Harry Potter video game, that was the only time she actually got to say a spell in the franchise, as she didn't get to cast any on-screen in the films.
- Although she portrayed a Ravenclaw in the Harry Potter series, she took the test on Pottermore twice, and was sorted into Gryffindor both times.
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