
Quick answer — Hiroshi Arikawa voices Souichi Kaga in Bunny Drop, Hayato Fuurinji in Kenichi: The Mightiest Disciple, Hoody in Ergo Proxy and 2 more characters.
Hiroshi Arikawa voices Souichi Kaga (Bunny Drop), Hayato Fuurinji (Kenichi: The Mightiest Disciple), Hoody (Ergo Proxy), Mr. Outside (Eden of the East), Jiko Zico (KIBA).
Souichi Kaga is voiced in Japanese by Hiroshi Arikawa.