Mamoru Yamaguchi is a Japanese mixed martial artist who competes in Pancrase. He is the former Shooto Bantamweight (123 lb) Champion, former Shooto Featherweight (132 lb) Champion, former Pancrase Flyweight Champion, as well as a former King of the Cage Junior Flyweight Champion. Mamoru is known for his counter striking and his trilogy with the former Shooto Bantamweight Champion Shinichi Kojima.

Shuichiro Katsumura is a Japanese former mixed martial artist and professional wrestler who currently competes for DDT Pro-Wrestling, where he was an Independent World Junior Heavyweight champion. He competed in the Flyweight, Bantamweight and Featherweight divisions. Katsumura is credited in popularizing the "Ninja Choke" submission and is the current owner of ZST.