The phoenix.

It's not like I want to tell you something.
All I want is to beyblade.
(And always being better than Takao...)
So don't annoy me, okay?

Kai Hiwatari (火渡カイ, Hiwatari Kai) is the captain of the Team BBA (Bladebreakers) and the keeper of the phoenix bit-beast Dranzer, or in the original Japanese version, Suzaku, the phoenix god of the South in Chinese/Japanese legend.

Although rather introverted, Kai is far more expressive when he beyblades, depicting the great importance that blading holds over his life. Even as the captain of the Bladebreakers, he always kept a certain distance from his teammates. According to Emily, Kai was afraid to get to know them as he might start to like them which, eventually, happens. He appeared to not know the meaning of friendship after being alone and friendless most of his life, only caring for his abusive grandfather who continuously used him. While Kai was stuck in the ice at Baikal Lake and his teammates, who he had betrayed and insulted, desperately tried to save him, he was appalled to realize that they liked him and never stopped being his friends, finally shattering the "invisible wall" he created. As the series progresses, he matures and becomes more open with his team-mates and grows more comfortable around them. In the end, despite his differences with many of his peers in the Beyblade community, Kai sacrifices a great deal to free the world of the influence of Boris Balkov and his BEGA company.

Kai also seems to be caring about his team mates, since he has saved them many times.

His most distinguished trait is his sense of pride and fairness.

Although a tough guy, he is shown giving a cat milk, bringing food for a family of cats and feeding a dog.