Shinichi Chiba , known internationally as Sonny Chiba, was a Japanese actor and martial artist. Chiba was one of the first actors to achieve stardom through his skills in martial arts, initially in Japan and later before an international audience.

Masutatsu Ōyama , more commonly known as Mas Oyama, was a South Korean karate master who founded Kyokushin Karate, considered the first and most influential style of full contact karate. Oyama was an ethnic Korean; he was born Choi Yeong-eui and spent most of his life in Japan. He acquired Japanese citizenship in 1968.