She is a rich, cheerful, and cute girl with a gentle personality who plays keyboards and is the main composer of the band Ho-kago Tea Time. Tsumugi sometimes displays rebellious tendencies because she wants to stand out from other rich people. Tsumugi has long, wavy blonde hair, sapphire blue eyes, and very fair skin, which sets her apart from the other girls in HTT. She also has thick yellow-brown eyebrows, just like her father. She is 15-19 years old and stands at 157 cm tall.