Kaoru Natasho is a student at the all-boys school that serves as the primary setting for the series, where he occupies a unique and specialized role. He is the costume designer for the school's Princesses, the selected male students who dress in female clothing to raise morale among the student body. Natasho is a member of the home economics section of the school, which aligns with his skills in garment creation and design.

In terms of personality, Natasho is presented as an extremely egotistical and self-absorbed individual. His primary, and seemingly only, passion in life is clothing, to which he dedicates his complete attention and fervor. This singular focus manifests as an over-enthusiastic and over-the-top demeanor, particularly when he is engaged in designing or creating new outfits. His inspiration is drawn directly from the faces and appearances of his subjects, the Princesses, for whom he develops what can be described as an adoring and almost fetishistic devotion to their clothing. Despite his intense and self-centered nature, Natasho is acknowledged as a genius in his craft. His fellow club members, whom he treats as assistants, and other students do not dislike him, suggesting that his eccentricity and skill are respected or at least tolerated within the school's social framework.

Natasho's primary motivation is the fulfillment of his own creative and aesthetic fantasies through the medium of dress. He channels his energy into designing and producing appropriate costumes for the various performances and events that the Princesses are required to attend. His enthusiasm for this task borders on worship, and he sees his work as a crucial form of support for the Princesses. In this way, his intense personal interest in fashion aligns with the wider student body's admiration for the Princesses, making him a representative embodiment of that collective fascination.

His role in the story is therefore distinctly supportive and technical. While he is not one of the central Princess characters, he is instrumental in maintaining their public image and enabling their activities through his designs. He does not have a deeply explored character arc that transforms his core personality. Instead, his development is static; he remains consistently egotistical and genius-level in his fashion design, with his interactions highlighting how this singular, powerful passion integrates him into the school community. His notable ability is, unequivocally, his genius-level talent for creating costumes, which is the sole focus of his actions and the lens through which he views the world.