Kitamura serves as the manager for Super Sonico, handling her modeling assignments, band performances with First Astronomical Velocity, and daily professional schedule. He is a tall man with distinctive orange-yellow hair styled to resemble flames and is always dressed in a black suit. His most notable visual trait is the hannya mask he wears at all times, which he has never removed throughout the series, keeping his true face hidden. He also carries a katana strapped to his back under his coat, suggesting a background in swordsmanship.

His personality presents a clear contrast between his intimidating appearance and his actual demeanor. While his demonic mask and weapon may seem threatening, Kitamura is generally friendly, sociable, and talkative. He actively seeks out modeling opportunities for Sonico, sometimes overcommitting her to jobs in his enthusiasm. However, he is deeply protective of Sonico and her public image. Whenever anyone threatens her, attempts something inappropriate, or tries to cross her boundaries, he is prepared to act swiftly and forcefully, living up to his fierce outward appearance.

His primary motivation is to safeguard Sonico's well-being and career, ensuring she can pursue her dual roles as a gravure idol and musician without harm or exploitation. He approaches this responsibility with professional efficiency and personal dedication, though his protective instincts can sometimes lead to unexpected situations. For example, during a modeling shoot in Okinawa, he became so invested in watching over Sonico during an action film sequence that his own protective reaction caused him to unwillingly become the star of that week's television episode.

Kitamura's role in the story is that of a supporting figure who manages the business side of Sonico's entertainment career. He coordinates her bookings, oversees photo shoots and band gigs, and handles logistics for events. His presence anchors the professional world that Sonico navigates alongside her college life and personal relationships. He interacts regularly with Sonico's roommates and bandmates, Fuuri Watanuki and Suzu Fujimi, while also navigating professional overlaps with Ouka Satsurikuin's representatives. He is portrayed as a master of the sword, a skill he appears ready to use if necessary, though he generally channels his intensity into protective vigilance rather than aggression. Throughout the series, his character remains consistent, showing no significant personal evolution beyond his steadfast role as her manager and guardian.