
Quick answer — Mami Kameoka voices Hiroko Oukubo in Cross Game, Agito in Magical Girl Lyrical Nanoha ViVid.
Mami Kameoka voices Hiroko Oukubo (Cross Game), Agito (Magical Girl Lyrical Nanoha ViVid).
Hiroko Oukubo is voiced in Japanese by Mami Kameoka.