
Quick answer — Natsumi Hioka voices Kotoha Aoyama in Mitsuboshi Colors, Shii Eniwa in Super Cub, Koharu Minagi in Slow Loop and 18 more characters.
Natsumi Hioka voices Kotoha Aoyama (Mitsuboshi Colors), Shii Eniwa (Super Cub), Koharu Minagi (Slow Loop), Tsukuyo Inaba (Armed Girl's Machiavellism), Alka (Suppose a Kid from the Last Dungeon Boonies moved to a starter town?), Machi Amayadori (Kumamiko -Girl Meets Bear), Zenobia (That Time I Got Reincarnated as a Slime: Visions of Coleus), Miyo Murosaki (ONIMAI: I'm Now Your Sister!) and 13 more.
Kotoha Aoyama is voiced in Japanese by Natsumi Hioka.