Tsugiko serves as a supporting character in Phantom of the Idol. An office worker by day, she dedicates her free time as an ardent fan of the idol duo ZINGS, focusing her enthusiastic support specifically on member Yuya Niyodo. Visually, Tsugiko sports brown hair and a distinctive outfit: a cornflower blue sweater layered over a light teal shirt, paired with a black-gray skirt and bright red high heels. She actively attends ZINGS concerts and events, frequently appearing alongside fellow dedicated fans Kasenjiki and Shigutaro; together, they form an observant group reacting to the idols' endeavors. Tsugiko bears a notable physical resemblance to ZINGS' manager, Hitomi Shinano, a likeness acknowledged within the narrative despite no confirmed familial connection. Her primary role centers on representing the dedicated idol fan perspective within the audience. Through participation in fan activities and reactions, particularly to Niyodo's varying performance energy, she contributes to depicting ZINGS' fanbase dynamics, consistently reinforcing her position as a supportive figure within the context of their performances and fan interactions.