Ken Yamaguchi (山口 健 Yamaguchi Ken), (1956-2011), was a seiyū from Tokyo (Fukushima Prefecture originally). He was last represented by OYS Produce, his own company.
He is most known for the roles of Asuraman, The Omegaman, Prisman (Kinnikuman: Scramble for the Throne), Genji Togashi (Sakigake!! Otokojuku), Flazzard (Dragon Quest: Dai's Great Adventure), Tarantula Arachne (Saint Seiya), and Gakurandar (Machine Robo: Battle Hackers).
He died on October 24, 2011 due to acute heart failure.
- Ken Yamaguchi at Anime News Network's Encyclopedia