Age: 18 or 19 Birthday: April 7 (Aries) Height: 177.8 cm (5'10") Koichi Mizuki is a Japanese teenage boy and one of the main protagonists alongside Caius in The Titan's Bride series. He is a graduated senior and was previously the captain of the Basketball Club for 3 years and received excellent grades at Touou High. He appears to be very popular at school by the girls for his good-looks, athleticism and even his height. (Source: The Titan's Bride Wiki)