Kai (Kickin' It)

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http://disneyskickinit.wikia.com/wiki/Kai

Kai is currently the Junior World Martial arts champion. He is Jack 's cousin, and he beat Jack really badly in one match. He trained with Jack, learning from their Grandfather. Jack's family is ashamed of Kai because he thought about Karate as intimidation and hurting people. He was seen only once in "Kickin' It In China."