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Riku is the younger brother of Kai and Saya in the anime Blood .
Riku is the younger foster brother of Kai and Saya. While he is not as hot-headed as Kai he is no less loyal to Saya. He loves to cook and has a kind, gentle nature. Interestingly he is the only character in the anime, apart from Saya, to form any kind of connection to Hagi. Hagi being the quiet, reclusive person he is would be left alone by most but Riku is so pure of heart that he wont allow Hagi to be lonely. Hagi responds to this kindness and teaches Riku to play the cello and when Riku is injured on the train attack in Russia, Hagi takes care of his injury. Being the younger brother Riku looks up to Kai and admires him, though he does not always agree with Kai's decisions and when David leaves them behind , Riku is more accepting of their fate than Kai.
Unfortunately for Riku, Diva takes an obsessive interest in him which leads to more tragedy for the Miyagusuku family as she hunter down, rapes, and kills Riku. Diva later on becomes pregnant with his children.