Kunoichi is a female ninja and a member of the Oniwabanshū, serving under a superior known as Kashira. Yoshimune knows her well and addresses her with the familiar nickname Kuno. Her personality is marked by a strong romantic attachment to Yoshimune; she shows clear jealousy when he fights desperately in a sword tournament for a chance to kiss Hime, and she openly dislikes Hime as a rival. Within the comedic parallel‑world setting that blends Edo‑period trappings with modern touches, Kunoichi appears as a loyal but emotionally driven kunoichi whose actions are motivated by unrequited love and a need to stay close to Yoshimune. Her exact background, personal history, and specific ninja skills are not detailed, but as a member of the Oniwabanshū she is assumed to possess standard ninja training in stealth and combat. She functions as a supporting presence in the castle, her interactions driven largely by her feelings for Yoshimune and her antagonism toward Hime, with no further visible development noted in the series.