
Quick answer — Kazunari Tanaka voices Hachirota Hoshino in Planetes, Shinichirou Tamaki in Code Geass: Lelouch of the Rebellion, Keishin Ukai in HAIKYU!! and 6 more characters.
Kazunari Tanaka voices Hachirota Hoshino (Planetes), Shinichirou Tamaki (Code Geass: Lelouch of the Rebellion), Keishin Ukai (HAIKYU!!), Tsutomu Rokutanda (Marmalade Boy), Cado (Dragon Ball: Yo! Son Goku and His Friends Return!!), Fukae no Chichi (I My Me! Strawberry Eggs), Miyoshi Seikai Nyuudou (Brave 10), Otto Strauss (Schwarzes Marken) and 1 more.
Hachirota Hoshino is voiced in Japanese by Kazunari Tanaka.