Chihiro Senkawa fulfills the role of secretary to the Producer at 346 Production, managing administrative duties, paperwork, and phone communications. She acts as the game's tutorial guide, introducing rules, features, and idol career specifics to newcomers. Her responsibilities encompass mission oversight, assigning objectives, and coordinating in-game events. During the Producer's absence, she assumes full office command, with idols acknowledging her authority.

Aged 25, she stands 154 cm tall, marking her as the franchise's shortest secretary. Her physical measurements are 82-58-84 cm. She possesses light brown hair, bright red eyes, and blood type A. Her birthday falls on November 28. Typically illustrated in office attire reminiscent of a school uniform, her visual portrayal varies across media, occasionally appearing younger or older.

Her demeanor is consistently upbeat, positive, and helpful. She demonstrates unshakeable loyalty to the Producer through both triumphs and setbacks, offering support even during task failures or lack of idol recognition. Personal hobbies include cosplaying and partying; she stores cosplay outfits in her office, maintaining they are private possessions. This interest manifests in themed events, such as her 2016 April Fools' performance of "Onegai! Cinderella" in *Starlight Stage* featuring a distinct 3D model.

Her professional rapport with the Producer occasionally carries romantic undertones, highlighted when she accepts his jacket during overwork or provides Valentine's Day encouragement. Fan circles frequently pair her with Mishiro despite no canonical interactions. A minigame involves her evading the Producer's water gun until exhaustion.

She shares a November 28 birthday with Sora Nonomura and originates from Tokyo, alongside fellow idols Kotoka Saionji and Chitose Kurosaki.