Tomoe Udagawa drums for Afterglow and attends Haneoka Girls' High School as a third-year student. Towering at 168cm, she possesses long maroon hair and turquoise eyes, frequently dressed in mature punk-inspired outfits studded with metal accents. Her appearance distinctly contrasts with her younger sister Ako, particularly in height, eye shape, and color palette. She exhibits a relaxed, candid nature, avoiding negativity and grudges. Tomoe blends cool-headed maturity with fiery protectiveness when defending loved ones, sometimes sparking unintended results. Within Afterglow, she acts as the stabilizing core, maintaining band cohesion through her dependable yet easygoing presence. Her surprising synchronization with energetic personalities like Kasumi or Kokoro catches others off guard. Deep community roots define her background, especially her decade-long respect earned performing taiko at local festivals, admired by shopping district adults. She works part-time at Galaxy Ramen with Masuki and previously at a fast-food joint with bandmate Himari, acknowledging Himari as her closest confidant. Tomoe remains modest about her status among Haneoka's most popular students. In Garupa Pico, her drumming passion surfaces diversely: discussing percussion intricacies with fellow band drummers, channeling intense competitive focus into arcade rhythm games, or engaging in lighthearted antics like mirroring Moca's dialogue or participating in a Halloween body-swap prank. Her relationship with Ako mixes sibling rivalry with staunch support. While occasionally baffled by Ako's chuunibyou expressions, Tomoe consistently champions her sister's drumming in Roselia, their interactions balancing affectionate teasing with unwavering loyalty. Beyond music, she collects and reads landscape photobooks and invigorates herself before performances with the ritual chant "soi-ya." Her culinary preference leans strongly toward pork and soy sauce ramen, with no dislikes noted.