Quick answer — Mana Ogawa voices Hitsugi Nikaidou in HYAKKO, Mami Koizumi in Let's Make a Mug Too 2.
Mana Ogawa voices Hitsugi Nikaidou (HYAKKO), Mami Koizumi (Let's Make a Mug Too 2).
Hitsugi Nikaidou is voiced in Japanese by Mana Ogawa.