Quick answer — Kenji Takahashi voices Hiroshi Tsuboguchi in Chihayafuru 2, Hong Long in Mobile Suit Gundam 00, Howard Mason in Mobile Suit Gundam 00 and 6 more characters.
Kenji Takahashi voices Hiroshi Tsuboguchi (Chihayafuru 2), Hong Long (Mobile Suit Gundam 00), Howard Mason (Mobile Suit Gundam 00), Gakuto (the Garden of sinners Chapter 2: …and nothing heart. (Murder Speculation Part A)), Richard Harrington (Phantom: Requiem for the Phantom), Argath (Broken Blade), Shishimaru Sengoku (HYAKKO), Yodai Higashizawa (The World Ends with You The Animation) and 1 more.
Hiroshi Tsuboguchi is voiced in Japanese by Kenji Takahashi.
