Kiva Kurenai is the main protagonist of Kamen Rider Kiva. He is a quiet, socially awkward young man who works as a violin maker and inherits the power of Kamen Rider Kiva from his father, Otoya Kurenai. As the series unfolds, he becomes central to the conflict between humans and Fangires, uncovering his own mysterious heritage and the legacy of his family. His role is to fight the Fangire threat while struggling with identity, responsibility, and the burden of his bloodline.