Rimi Ushigome evolves from a timid first-year to a determined third-year student at Hanasakigawa Girls' High School, her journey marked by struggles with stage fright and quiet perseverance. Though shy and prone to self-comparison, her reserved exterior masks a resolve to outgrow hesitation, catalyzed by joining Poppin’Party. Hailing from the Kansai region, her dialect surfaces during moments of nervousness or enthusiasm, a subtle nod to her roots. A pink ESP Viper Bass gifted by her sister Yuri—Glitter*Green’s vocalist—anchors her musical passion. Kasumi Toyama’s spirited entrance ceremony speech sparks Rimi’s curiosity, yet fear initially holds her back from joining the band. Fate intervenes when a delayed Glitter*Green performance thrusts Rimi, Kasumi, and Arisa into an impromptu SPACE live show, breaking her stage anxiety and cementing her role as Poppin’Party’s bassist. Over time, she emerges as a composer and steadying force, her resilience quietly underpinning the group’s dynamics. Sweet yet occasionally headstrong, Rimi flushes easily when flustered. Her devotion to Yamabuki Bakery’s chocolate cornets borders on legendary, with a single refusal alarming friends. She recoils from mint chocolate but gravitates toward horror media, despite avoiding haunted houses. At 150 cm, her petite stature fuels wistful wishes for height gains, contrasting her growing inner confidence. Alternate timelines reimagine her persona: in “Girl’s Blossom Project,” she bonds with Himari Uehara over fandom for Kaoru Seta and drama club rehearsals, while manga iterations cast her as a mischievous ninja hawking rice—a playful divergence from her earnest main self. Relationships deepen through affectionate “-chan” honorifics for bandmates, a steadfast bond with Misaki and Himari, and starry-eyed admiration for Kaoru. Her arc traces a path from doubt to quiet assurance, loyalty to Poppin’Party and shared triumphs shaping her into an anchor of both music and friendship.