
Quick answer — Kazuhiro Nakata voices Bear in .hack//SIGN, Hajime Fukuroda in GTO: Great Teacher Onizuka, Tomoyuki Tachi in Initial D 4th Stage and 15 more characters.
Kazuhiro Nakata voices Bear (.hack//SIGN), Hajime Fukuroda (GTO: Great Teacher Onizuka), Tomoyuki Tachi (Initial D 4th Stage), Randy (Gungrave), Halcyform (The Slayers Next), Aragon (The Irresponsible Captain Tylor), Mickey Cryburn (The Irresponsible Captain Tylor), Ronald MacDougall (Outlaw Star) and 10 more.
Bear is voiced in Japanese by Kazuhiro Nakata.