Sano and Akira who

Sano: a guy dressed in black pants, a blue shirt and a lab coat, black hair, has a target blue eye and she has gray eyes, race: a naga demon, Akira: a hyperactive guy, a hired killer, the complete opposite of Sano, he is also a naga demon

"Cursed" at birth for being half-Naga, Sano and his family were despised by the village for having children who could walk on two legs. Kiku's maternal instincts were those of a normal snake. She was loath to abandon them, but she rarely cared for the twins either. Sano and Akira were later raised by Cain. Sano: A somewhat cold and level-headed person. He has lost a lot in his life and is trying his best to pick up the pieces. Akira seems to be very similar in appearance to Sano, as noted by a player when he was first shown. He has two piercings on each ear and an ear cuff. Akira is usually depicted in casual street fashion.