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BEST FRIENDS! is a unit consisting of the main seiyuus/singers of the Aikatsu Friends! cast. The members voice and sing for the main characters in Aikatsu Friends!. They go mononymously under the names of the characters they voice in the franchise.
- 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
- Yui Ninomiya (二ノ宮ゆい) → Ema (エマ) as Ema Hinata
- Karen Miyama (美山加恋) → Maika (まいか) as Maika Chōno
- 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
- Sumire Morohoshi (諸星すみれ) → Coco (ココ) as Coco
- BEST FRIENDS! is the third unit under the Aikatsu! franchise whose members sing for the characters, following their predecessors STAR☆ANIS and AIKATSU☆STARS
- BEST FRIENDS is the first unit whose members also voice the character they sing for.
- The members of BEST FRIENDS are the first ones whose songs are credited under their character's names.
- Miyama Karen shares the same given name with Kamishiro Karen, although they are written differently.