Ki Hyun Ryu (Hangul: 류기현) is a television director of animated cartoons. He helped with character design for the episode "Jet" in Avatar: The Last Airbender and later returned for The Legend of Korra, directing every episode of Book One: Air. He has also worked as a character designer and supervising producer across all four books.
Ryu's creative insight has been influencing the Avatar franchise for far longer than the beginning of The Legend of Korra: he created the original character design of Jet,[2] suggesting that he has had a part in the show since quite early in production.
Interestingly, Ryu's name has been worded as "Ryu Ki Hyun" by Konietzko on occasion,[1] likely in concern to Ryu's Korean origin; Korean names are spoken in a format that starts with a surname, followed by the given name.
The design of the character Ryu was based on Ki Hyun Ryu.[3]