This issue is debatable, like the Tyson-Hilary-Kai one. It is implied that he spent his childhood in Russia, because he used to be on the Demolition Boys team. His grandfather lives in Russia, and his house in Japan is also built according to Russian style. Kai's last name, however, is Hiwatari, which is Japanese, and his father's name was also Susumu Hiwatari. Also, Kai is the heir to a large Japanese military company, "Hiwatari Enterprises". But, it is stated that he was born and raised in Russia. It is possible that either his mother was Russian, or that he is of Japanese descent and was merely born in Russia.
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