Taiga Nobori (登 太牙, Nobori Taiga) is the current king of the Fangire and Kamen Rider Saga (仮面ライダーサガ, Kamen Raidā Saga, Masked Rider Saga). He later becomes Kamen Rider Dark Kiva (仮面ライダーダークキバ, Kamen Raidā Dāku Kiba, Masked Rider Dark Kiva). Initially the fiance of Mio Suzuki, he learns that she becomes willing to abandon her Fangire heritage and her future as Queen of the Fangires to be together with his half-brother, Wataru Kurenai, resulting in conflict between the brothers.