Kyouko Sonan, a 23-year-old Intelligence Agent for Beauty Salon PRINCE, locates individuals with Hi-ERo particles to evaluate their power and potential as pilots for the robot Daimidaler. She harbors intense animosity toward the Penguin Empire, stemming from past events where its invasive "Front Tail Dancing" ritual traumatized her father. As Daimidaler's co-pilot, Kyouko reluctantly acts as the catalyst for Kouichi Madanbashi's Hi-ERo energy release, enduring his distasteful groping to power the robot. While initially frustrated by this necessity, her interactions with Kouichi suggest emerging personal feelings over time. During a pivotal battle against a Penguin Empire robot, Kyouko witnesses Kouichi sacrifice himself to shield her from an explosion, resulting in his presumed death and leaving her severely injured. Recovering in a medical facility, she later reawakens upon sensing Kouichi's presence through a resonance of his Hi-ERo particles, prompting her to launch Daimidaler's severed left arm to retrieve him. Kyouko has dark violet hair and purple eyes.