Nanoka Aizawa is a second-generation member of I-1 Club, a nationally prominent idol group dominating the industry with its large, tiered-army membership structure. Her full name is written as 相沢菜野花, and she is widely known by the nickname "Nanokasu". A key factor in her popularity is her consistent use of glasses during all performances and promotional activities, a distinctive trait that sets her apart within the extensive roster.

She participates in subgroup activities as part of Team S, performing alongside members such as Shiho Iwasaki, Mai Kondo, and Megumi Yoshikawa. Her surname "Aizawa" combines the kanji for "phase/aspect" (相) and "swamp/marsh" (沢). Her given name "Nanoka" incorporates the characters for "vegetables/greens" (菜), "field/wilderness" (野), and "flower/blossom" (花).

Physically, she is 19 years old with dark brown hair and brown eyes, standing 1.60 meters tall. She appears across the franchise's media, including anime, manga like "Little Challenger: Wake Up, Girls! I-1 Club Side Story", "Wake Up, Girls! Leaders", and "Wake Up, Girls! Eternal Senses", and games.