Iori Izumi, a 17-year-old high school student, maintains a calm, rational facade sharpened by a biting wit. He reluctantly entered the idol world to secure his older brother Mitsuki’s place after multiple failed auditions, bargaining his own participation on Mitsuki’s recruitment. His methodical strategies and insistence on structure clash with a tendency to falter under spontaneity, as seen in early performances where hesitation bred errors.

Growing up in a family-owned dessert shop adorned with whimsical decor, he harbors an covert affinity for cute collectibles like the Usamimi Friends series—a preference he masks to preserve his aloof image. This fear of judgment fuels his clandestine guidance of the group’s manager, avoiding overt involvement to sidestep past clashes with Mitsuki over perceived meddling.

Protective instincts drive his interactions with vulnerable peers, notably Riku, whose health struggles prompted Iori to temporarily take the center role. The move sparked fanbase tensions, forcing him to navigate leadership demands against group cohesion. His bond with classmate Tamaki thrives on pragmatic interdependence, marked by synchronized school transfers and a pact to avoid alcohol after Riku’s drunken mishaps.

A former student council member, his sweet tooth rivals Tamaki’s, while childhood memories linger of Mitsuki exploiting his acute ticklishness. He dissects scripts with a critical eye, lamenting implausible tropes even as he begrudgingly participates in creative brainstorming. Behind his composed veneer, insecurity gnaws—doubting his worth beyond logistical support and measuring himself against Mitsuki’s emotional fortitude.

Over time, he evolves from viewing idol work as a duty to embracing its joys, from performances to camaraderie. Later arcs trace his efforts to harmonize rigid planning with the industry’s chaos while mentoring reserved members like Sogo and Nagi, balancing control with adaptability.