Kitamura serves as the dedicated modeling manager for Sonico in SoniAni: Super Sonico the Animation. His background is largely shrouded in mystery, as he consistently wears a full-head demon-like mask that he never removes and carries a katana with him at all times. These distinctive traits give him an intimidating and enigmatic presence. Despite this fearsome appearance, Kitamura possesses a kind and protective personality. He acts as a guardian or father figure to Sonico, always looking after her well-being.

His primary motivation is to protect Sonico from any form of exploitation or harm, particularly from those who might seek to over-sexualize her in her modeling career. This protective instinct is so strong that it can become a source of comedy. In one notable incident during a shoot in Okinawa, an actor portraying a character harassing Sonico triggered Kitamura's instincts, leading him to physically assault the actor and chase him with his sword, inadvertently becoming the unwilling star of a superhero television episode. While generally serious and vigilant, he has a notable weakness for alcohol, as he becomes very easy to manipulate when drunk.

Kitamura's role in the story is central to Sonico's professional life. He accompanies her to modeling assignments and works to ensure her safety and dignity. His key relationship is with Sonico herself, whom he watches over with unwavering devotion. He is also shown interacting with clients and production staff during her jobs, where his intimidating look often has a noticeable effect on others. While Kitamura himself does not undergo significant personal development, his unwavering dedication serves as a constant and defining element of the series, providing security for Sonico and often creating humorous situations through his extreme protectiveness. Regarding his abilities, Kitamura is a master of the sword, a skill he readily displays when defending Sonico.