Mr. Kitamura serves as the manager and handler for Super Sonico and her band, First Astronomical Velocity. He is a tall man with orange-yellow flame-styled hair who is always seen wearing a black suit and a Hannya mask that he never removes. A katana is carried on his back beneath his coat, and he is noted to be a master of the sword. His appearance is intimidating, but his personality is more layered. When not in a protective stance, he is friendly, sociable, and talkative. He actively seeks out modeling work for Sonico, sometimes overcommitting her schedule, and handles the logistics of her photo shoots, band performances, and daily professional activities with efficiency.

Kitamura's primary motivation is the protection and success of Sonico. He is incredibly protective of her and her image, ready to threaten or physically confront anyone who crosses her boundaries or attempts something inappropriate. This fierce loyalty extends to ensuring she is treated respectfully in the entertainment industry. His role in the story is that of a recurring supporting figure who represents the business side of Sonico's idol and modeling career. He coordinates her opportunities and acts as a gatekeeper, ensuring only professional and safe engagements proceed.

His key relationships are with Sonico, whom he manages and guards vigilantly, and indirectly with her bandmates Fuuri Watanuki and Suzu Fujimi through band management. He also occasionally interacts with representatives of rival idol Ouka in the competitive industry. Kitamura shows no significant character development over the course of the series; his role remains consistent as a steadfast, efficient, and protective manager. His notable abilities include expert swordsmanship and a commanding presence that can intimidate or upstage others, as seen when he accidentally becomes a guest hero in a television show after dealing with an overly aggressive actor.