STAR☆ANIS is a Japanese idol group who are the featured performers for songs in relation to the Data Carddass Aikatsu! game, as well as the anime adaption for it.
In the related Aikatsu! anime adaption itself (for season 1), the members consist of the eight main characters.
Each member of STAR☆ANIS represents at least one of the Aikatsu! main characters, and therefore serve as their singing voice actor.
Eight official members:
Waka (わか) – Waka Kirishima (霧島若歌) as Ichigo Hoshimiya
Fūri (ふうり) – Fuuri Uebana (上花楓裏) as Aoi Kiriya and Seira Otoshiro
Yuna (ゆな) – Yuna Ichikura (市倉有菜) as Ran Shibuki, Kaede Ichinose, and Kii Saegusa
Remi (れみ) – Remi Mitani (美谷玲実) as Otome Arisugawa, Yurika Toudou, and Miyabi Fujiwara
Eri (えり) – Eri Aino (愛野えり) as Sakura Kitaouji, Sora Kazesawa, Maria Himesato, and Kokone Kurisu
Risuko (りすこ) – Risuko Sasakama (ささかまリス子) as Mizuki Kanzaki
Mona (もな) – Mona Tomoyama (巴山萌菜) as Mikuru Natsuki
Ruka (るか) – Ruka Endō (遠藤瑠香) as Akari Oozora
Additional unlisted member:
Eimi (えいみ) – Eimi Naruse (成瀬瑛美) as Miya
Risa (りさ) – Risa Aizawa (相沢梨紗) as Hime
Nemu (ねむ) – Nemu Yumemi (夢眠ねむ) as Guppy
Additional listed member:
Yuniko (ゆにこ) – Yuniko Morishita (森下ゆにこ) as Hikari Minowa
Graduated members:
Sunao (すなお) – Sunao Yoshikawa (吉河順央) as Ran Shibuki and Sora Kazesawa
Moe (もえ) – Moe Yamazaki (山崎もえ) as Yurika Toudou
(Source: Aikatsu Wikia)
Twitter: @staranis_info