
Quick answer — Emi Nitta voices Honoka Kousaka in Love Live! School Idol Project, Tsumugi in Night World, Rikka Morizono in D.C.III: Da Capo III and 7 more characters.
Emi Nitta voices Honoka Kousaka (Love Live! School Idol Project), Tsumugi (Night World), Rikka Morizono (D.C.III: Da Capo III), Mahiru (Princess Connect! Re:Dive), Malga Naruze (Horizon in the Middle of Nowhere), Miyako Mima (Locodol), Akari Koumoto (Actually, I Am), Elsa Crucial (I Couldn’t Become a Hero, So I Reluctantly Decided to Get a Job.) and 2 more.
Honoka Kousaka is voiced in Japanese by Emi Nitta.