
Quick answer — Nanaho Katsuragi voices Seki-sensei in Magical DoReMi, Sakura in Broken Blade, Venus Kamiyama in God Family and 1 more characters.
Nanaho Katsuragi voices Seki-sensei (Magical DoReMi), Sakura (Broken Blade), Venus Kamiyama (God Family), Mio Hayase (Air Master).
Seki-sensei is voiced in Japanese by Nanaho Katsuragi.