Tomoe Udagawa, a third-year student at Haneoka Girls’ Academy, serves as the steady drummer for Afterglow, grounding the band with her candid, easygoing demeanor. Her aversion to grudges and negativity fosters harmony, while her blunt honesty sometimes sparks playful antics, yet she consistently proves her reliability in navigating group tensions.

She shares a spirited dynamic with her younger sister Ako, Roselia’s drummer, blending competitive drumming challenges with unwavering mutual support. Beyond music, Tomoe upholds local traditions through taiko performances at community festivals, earning the trust of shopping district elders who value her teamwork and dedication.

Fashion-forward yet relaxed, Tomoe balances creative expression with an unhurried outlook. The BanG Dream! GARUPA PICO Fever! episode "Tomoe at the Arcade" spotlights her rhythmic passion as she masters arcade drum games, while earlier Pico installments like "Drummers Gotta Drum" feature her swapping stories with fellow percussionists about shared struggles, such as hauling bulky drum kits, reinforcing her bonds across band lines.

Though committed to Afterglow’s unity, Tomoe’s subtle leadership shines through her adaptability and humor, ensuring cohesion without seeking the spotlight. Her seamless shifts between festival traditions, casual arcade sessions, and collaborative music ventures paint her as a versatile figure equally at home in time-honored rituals and modern, laid-back spaces.