Kyo Kusanagi is one of the protagonists of the King of Fighters series and a regular member of the series roster since the original The King of Fighters '94. His arch-rival is Iori Yagami, and he has a girlfriend named Yuki, who appeared in The King of Fighters '97.
Kyo has played a predominant role in the franchise's overarching sagas, including the Orochi, NESTS, and Ash Crimson sagas. He has also been the subject of cloning and other genetic experiments performed by others intent on gaining control of fighters with the Kusanagi family's control over fire. Resulting characters have included Kyo-1, Kyo-2, Kusanagi, and K'.
In The King of Fighters '99, Kyo is a secret sub-boss, as well as an unlockable character.