
Quick answer — Mitsuo Senda voices George in Treasure Island, Kenneth in Kaleido Star, Ze Cai in Kingdom and 6 more characters.
Mitsuo Senda voices George (Treasure Island), Kenneth (Kaleido Star), Ze Cai (Kingdom), Dave Mccartney (Golgo 13 (TV)), Big Snake (Golgo 13: The Professional), Keikan (Blood: The Last Vampire), Miroku (07-Ghost), Housei Sanagida (Princess Resurrection) and 1 more.
George is voiced in Japanese by Mitsuo Senda.