
Quick answer — Ken Shiroyama voices Gaikotsu in Tomorrow's Joe, Norisada Izuna in Ga-Rei-Zero, Masayuki Oogami in Kaze no Stigma and 1 more characters.
Ken Shiroyama voices Gaikotsu (Tomorrow's Joe), Norisada Izuna (Ga-Rei-Zero), Masayuki Oogami (Kaze no Stigma), Fujihiro Yamakawa (Strike Witches).
Gaikotsu is voiced in Japanese by Ken Shiroyama.