
Quick answer — Nanami Kashiyama voices Momo Kisaragi in Mekakucity Actors, Utae Sonokoe in R-15, Shinjin Maid in Shomin Sample and 2 more characters.
Nanami Kashiyama voices Momo Kisaragi (Mekakucity Actors), Utae Sonokoe (R-15), Shinjin Maid (Shomin Sample), Taiiku Kyoushi (Shomin Sample), Midori-chan (Recorder and Randsell).
Momo Kisaragi is voiced in Japanese by Nanami Kashiyama.