Shinjiro Otani is a Japanese semi-retired professional wrestler and the current acting president of Pro Wrestling Zero1 (Zero1). He is currently inactive from pro-wrestling competition due to a cervical spine injury sustained in April 2022. A product of the New Japan Pro Wrestling (NJPW) dojo, Otani is best known for his longtime association with Zero1, a promotion he founded in 2001 along with Shinya Hashimoto.

Keiichi Yamada , better known as Jushin Liger and later Jushin Thunder Liger , is a Japanese retired professional wrestler and mixed martial artist, currently signed to New Japan Pro-Wrestling (NJPW). He is the longest-tenured member of the NJPW roster, having wrestled for the company since his debut in 1984 until his retirement in January 2020. Throughout his career, which spanned three-and-a-half decades, he wrestled over 4,000 matches and performed in major events for various promotions across the globe.