Kai is a human, and has a little smart sister called Nya, Kai was the main character in Ninjago although his parents are lost he wanted to choose his father powers so equal his father was Ray(1st Master of fire) who married Maya as Ray wife. 

Kai was born in 1998 and I know that Ninjago was out in 2011 but count back wards and you will see. Kai was reasonable to his sister Nya(Master of Water) so he can protect her with no harm, though he wished everything was good, better and back to normal although Wu was his uncle (Kai isn't part of the golden family but his family relationship) even Garmond but now he is older he can't call Wu as Uncle. So he trained as he wants to become a member of Master of Fire. 

Found in website.

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