Tomomitsu Yamaguchi (山口智充, Yamaguchi Tomomitsu; born March 14, 1969) is a Japanese comedian, actor, voice actor, singer and presenter from Shijōnawate, Osaka. He is a graduate of the Osaka Prefecture North Shijōnawate Senior High School. He is currently attached to the Yoshimoto Creative Agency. He is best known as the boke half of the Manzai act "DonDokoDon" alongside tsukkomi Keiji Hirahata.
Source: “Tomomitsu Yamaguchi”, English Wikipedia (CC BY-SA 4.0), excerpt