
Quick answer — Hirokazu Hiramatsu voices Michael Kohara in Ga-Rei-Zero, Soujirou Izumi in Lucky☆Star, Eibrad in I'm Quitting Heroing and 2 more characters.
Hirokazu Hiramatsu voices Michael Kohara (Ga-Rei-Zero), Soujirou Izumi (Lucky☆Star), Eibrad (I'm Quitting Heroing), Karyuudo Tsukishima (The Future Diary), Ispector Saehara (D.N.Angel).
Michael Kohara is voiced in Japanese by Hirokazu Hiramatsu.