The BanG Dream! Girls Band Party! Toyama Kasumi figure captures the spark of a live performance with a pose that suggests she is about to launch into a chorus. She wears Kasumi’s signature stage outfit in pink and white, with a frilly skirt, a compact jacket, and ribbon accents that flutter with the imaginary air of a concert. The sculpt emphasizes movement: one leg stepped forward, the body angled slightly as if mid-dance, and her hands positioned to strum a glossy guitar. The instrument gleams with metallic paint and a white pickguard, complemented by subtle shading on the hair and dress to highlight folds and highlights. The base features musical motifs and the band's emblem, inviting fans to imagine a high-energy show.

Toyama Kasumi is portrayed as the optimistic sparkplug of BanG Dream! Girls Band Party!, a girl who believes music can light up even the darkest days. Her motto—pursue the spark you feel when you hear a melody—drives her to form and lead Poppin' Party, gather friends, and practice until every note shines. Across the series, Kasumi’s joy is tempered by the realities of rehearsal, stage fright, and the pressure to perform in front of fans. She discovers the value of teamwork as Arisa, Tae, Rimi, and Saaya push herself and celebrate each milestone. Through gigs, sound checks, and festival stages, Kasumi learns responsibility, resilience, and the meaning of friendship in pursuit of a shared dream.