|Anime Debut||Episode 01|
|Singing Voice||Kana from AIKATSU☆STARS!|
|School Coord||Sky Night Coord|
Yamabuki Kaguya is a new idol appearing in Aikatsu Sparkle. Kagyua ia a calm and serene idol, who's a cute-typed idol. She is Sakuya's older twin sister. The gentle idol loves to write poems and her speciality is to write songs. Her primary brand is the cute typed Sanctuary.
Kaguya has multi colored eyes, her eyes are pink and purple colored. She has orange-reddish hair that she keeps tied into a bun, hold by a pink ribbon and golden bells. When tied kept open, her hair reaches over her shoulder, over her chest. She usually wears the Starlight uniform, which the jacket kept open. Outside the school, Kaguya wears a pink dress with a white sweater underneath. The dress is tied together by dark pink laces. She wears brown ankle boots with white socks.
Kaguya is a calm and serene idol, who is very gentle and skilled in writing songs. Her biggest hobby is to write poems about situations in life. Kaguya is elegant and graceful, however due to her young appearance, many people tend to refer her as "cute" instead of "elegant". Even though her calm nature, Kaguya can get very angry at others. She is also very sensitive and might attack others with bad statements if she's upset.
- Yamabuki Sakuya: Sakuya is Kaguya's younger twin sister, who used to attend the Dream Academy. After Kaguya showed her the advantages of Starlight, Sakuya transferred to school in order to be closer to her sister again.
Yamabuki (山吹?) - Yamabuki comes from Yama (山?) meaning "mountain" or "hill", combined with Buki (吹?) meaning "blow" or "blast". Yamabuki is also the Japanese name for the Kerria japonica, also known as Kerria.
Kaguya (かぐや?) - Kaguya means "bright night", coming from Kagu (輝?) meaning "bright" or "radiant", combined with Ya (夜?) meaning "night". Kaguya is also the name of the protagonist of the Japanese folklore "The Tale of the Bamboo Cutter". In The Tale of the Bamboo Cutter, Kaguya is a girl coming from the capital of the moon.
- Kaguya shares her singing voice with Amahane Madoka.
- Kaguya and Sakuya are the first idols to wear leg warmers in their school coords.
- Kaguya used to be called "Tsukikawa Izumi" during early states of Aikatsu Sparkle.
- Sakuya and Kaguya are the first Aikatsu! idols to be twins.
- Kaguya's idol theme color is sky blue.
- Unlike other Aikatsu! main characters, Kaguya's theme color is not pink.