
Quick answer — Tamio Ooki voices Midland no Ou in Berserk, Albert Ou in Nichijou - My Ordinary Life, Oigawa in Tomorrow's Joe and 19 more characters.
Tamio Ooki voices Midland no Ou (Berserk), Albert Ou (Nichijou - My Ordinary Life), Oigawa (Tomorrow's Joe), Daisuke Aramaki (Ghost in the Shell), Mushin (From the New World), The Communicator (Haibane Renmei), Ken-Goh (Eureka Seven), Lazar Lobos (Legend of the Galactic Heroes Gaiden: A Hundred Billion Stars) and 14 more.
Midland no Ou is voiced in Japanese by Tamio Ooki.