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BEST FRIENDS! is a specialized unit formed to be the featured performers for songs in relation to the Data Carddass Aikatsu Friends! and the anime. Each of the members provide both the speaking and singing voice of a main character in the Aikatsu Friends! universe, credited mononymously under their characters' names.
- Akane Matsunaga (松永あかね) → Aine (あいね) as Aine Yūki
- Ibuki Kido (木戸衣吹) → Mio (みお) as Mio Minato
- Karen Miyama (美山加恋) → Maika (
舞花) as Maika Chōno
- Yui Ninomiya (二ノ宮ゆい) → Ema (エマ) as Ema Hinata
- Azusa Tadokoro (田所あずさ) → Karen (カレン) as Karen Kamishiro
- Ayaka Ōhashi (大橋彩香) → Mirai (ミライ) as Mirai Asuka
- Emiri Suyama (陶山恵実里) → Sakuya (さくや) as Sakuya Shirayuri
- Yūki Kuwahara (桑原由気) → Kaguya (かぐや) as Kaguya Shirayuri
- They have a number of differences with their predecessors STAR☆ANIS and AIKATSU☆STARS!:
- Their unit name does not include the word "star" nor does it contain a star symbol (☆).
- The members of BEST FRIENDS! provide their characters' speaking voices in addition to their singing voices.
- They are also credited under their characters' names instead of their own given names.