
Quick answer — Hiro Nakajima voices Chousuke Takatsuki in The Idol Master, Eru Harune in Pretty Rhythm: Aurora Dream, Airi no Otouto in Wake Up, Girls!.
Hiro Nakajima voices Chousuke Takatsuki (The Idol Master), Eru Harune (Pretty Rhythm: Aurora Dream), Airi no Otouto (Wake Up, Girls!).
Chousuke Takatsuki is voiced in Japanese by Hiro Nakajima.