

Otoya Kurenai (紅 音也 Kurenai Otoya) was a violinist, and the primary user of the original IXA system. He was notable for being the only human to transform into Kamen Rider Dark Kiva, although the strain from doing so cost him his life.
Description[]
Otoya was a strange and eccentric womanizing man. While on one hand he has ruined the lives of others through his antics, he has also helped others change their lives for the better. Some of these people he helped change like Omura, Jiro and Maya remember him fondly and respects him greatly. Despite his oddness, Otoya is hinted to have a lot of life force with in him as he managed to live despite having his life energy drained by Castle Doran itself. He also managed to transform into Dark Kiva (also managing to transform into Ixa once then badly being beaten by the Bat Fangire between his second and third transformations) three times despite Maya stating that a normal human will die after becoming Dark Kiva even once. Although he wasn`t exactly the best role model, his son also respects him greatly and wished to meet him. When they do indeed meet, and Otoya learns that Wataru is his son, Otoya in his own way acted as a father for Wataru showing how much he can care for others. Even after sacrificing himself to stop the Bat Fangire, Otoya continues support his son through spirit and encouraged him to not give up when Wataru was fighting the revived Bat Fangire.