
Quick answer — Naoki Yanagi voices Mytho in Princess Tutu, Tadaaki Kusano in GTO: Great Teacher Onizuka, Moses in Blood+ and 3 more characters.
Naoki Yanagi voices Mytho (Princess Tutu), Tadaaki Kusano (GTO: Great Teacher Onizuka), Moses (Blood+), John Whittard (Ashita no Nadja), Yashamaru (Basilisk), Jeda (MoonPhase).
Mytho is voiced in Japanese by Naoki Yanagi.