Ryo Ashihara is the human identity of Kamen Rider Gills from the series Kamen Rider Agito. A former swimming athlete, Ryo’s life changes dramatically when he becomes infected with the mysterious Agito seed, which transforms him into Kamen Rider Gills. Throughout the series, he struggles with the uncontrollable powers and mutations brought on by his transformation, seeking the truth behind his father's death and the secrets of his own existence. Ryo is a tragic and determined character, often acting as a lone wolf while striving to protect others from similar fates.