Yusuke Godai (五代 雄介 Godai Yūsuke?), born in Hokkaidō on March 18, 1975, with a blood type of O is a happy-go-lucky and honest person that fights to protect everyone's smile as Kamen Rider Kuuga (仮面ライダークウガ Kamen Raidā Kūga?).The police called him the Unidentified Life Form #4 (未確認生命体第４号 Mikakunin Seimeitai Dai Yongō?). He and his younger sister, Minori, lost their mother while they were both young and their father at Afghanistan when they were older, living with their father's friend Tamasaburo Kazari.