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STARRY PLANET☆ is an idol unit formed to be the featured performers for songs in relation to the Data Carddass Aikatsu Planet! and the live action and anime. Each of the members play the role of a main character in the Aikatsu Planet! universe and provide the voice for their avatars. In songs, they are credited mononymously under their characters' real life names.
- Kāya Date (伊達花彩) → Mao (舞桜) as Mao Otoha
- Rio Ogura (小椋梨央) → Ruli (るり) as Ruli Tamaki
- Mizuki (瑞季) → Ayumi (愛弓) as Ayumi Tsukishiro
- Shizune Nagao (長尾寧音) → Kyōko (響子) as Kyōko Umekōji
- Rion Watanabe (渡邊璃音) → Shiori (栞) as Shiori Motoya
- Amy (エイミー) → Ann (杏) as Ann Kurimu
- Narumi Uno (宇野愛海) → Meisa (明咲) as Meisa Hinata
- Rurika Uno (羽野瑠華) → Sala (紗良) as Sala Itoi
- Being credited under their characters' real life names as opposed to the avatar names is likely because of Hana being played by two different people.
- The name of the unit is a possible reference to Stardust Planet, a department within Stardust Promotion that specializes in idols.