
Quick answer — Eizou Tsuda voices Umatarou Tenma in PLUTO, Keita Hayashi in Vivy -Fluorite Eye's Song-, Zeon Zum Deikun in Mobile Suit Gundam: The Origin and 14 more characters.
Eizou Tsuda voices Umatarou Tenma (PLUTO), Keita Hayashi (Vivy -Fluorite Eye's Song-), Zeon Zum Deikun (Mobile Suit Gundam: The Origin), Kouyou Touya (Hikaru no Go), Kevin Hamilton (Kaleido Star), Yasohara Sakagami (The Anthem of the Heart), Karabo Frampton (Lord El-Melloi II's Case Files {Rail Zeppelin} Grace note), Vahriz (The Heroic Legend of Arslan) and 9 more.
Umatarou Tenma is voiced in Japanese by Eizou Tsuda.