Masato Kobayashi is a Japanese retired welterweight kickboxer. He was the ISKA World Welterweight Oriental Rules champion, as well as the winner of the K-1 WORLD MAX World tournament in 2003 and 2008. In addition, he was also the runner-up of the K-1 World MAX World tournament in 2004 and 2007.
Sombat Banchamek a.k.a. Buakaw Banchamek is a professional kickboxer from Thailand of ethnic Kuy descent, who formerly fought out of Por. Pramuk Gym, in Bangkok, Thailand, under the ring name Buakaw Por. Pramuk.
Andy Souwer is a Dutch former welterweight kickboxer and mixed martial artist. He is a two-time K-1 World MAX champion and four-time Shootboxing World tournament champion as well as former It's Showtime 70MAX world champion, fighting out of Mejiro Gym in Amsterdam.
Yoshihiro Sato is a Japanese kickboxer competing in K-1 at middleweight (−70 kg). He is the former world champion of Muay Thai in WKA and WPKC, and he won the Japanese national tournament of K-1 twice in 2006 and 2007. His official nickname is "Mugen Sniper" which means Infinite Sniper. He is Matsuzaka Generation.
Gagik Harutyunyan, better known as Gago Drago, is an Armenian-born Dutch welterweight kickboxer from Alkmaar. He is known for his punch combinations and unpredictable kicking techniques and highly aggressive fighting style. Gago competed in K1-MAX and is trained at Loeks Gym, by Edwin van Os.
Albert “The Hurricane” Kraus is a Dutch welterweight kickboxer. He was the first K-1 World MAX Tournament Champion in 2002 and also the first SUPERKOMBAT Middleweight Champion. Kraus has also held four separate world titles in kickboxing and Muay Thai. He is currently fighting out of Super Pro Gym.
Virgil "The Conqueror" Kalakoda is a South African welterweight boxer and kickboxer, fighting out of Full Body Impact Gym in Sydney, Australia. He is former light-middleweight boxing champion and competed in K-1 MAX.
Gevorg "Giorgio" Petrosyan is an Armenian-born Italian kickboxer who competes in the middleweight division. He is nicknamed "The Doctor" and noted for his supreme technical skills, ringsmanship and defensive prowess which has seen him defeat some of the best strikers in the world while taking little-to-no damage. As of September 2022, he is ranked the #5 lightweight and #6 pound-for-pound kickboxer in the world by Combat Press, and is widely regarded as one of the greatest kickboxers of all time. As of October 27, 2022, he is ranked #4 in the ONE Featherweight Kickboxing rankings.
Dzhabar Askerov is a Russian Welterweight kickboxer fighting out of Melbourne, Australia and representing Russia. He is the World Muay Thai Council's Muay Thai Welterweight European Champion and K-1 MAX Scandinavia 2008 Tournament Finalist.
Andy Ologun(Listen) is a Nigerian professional boxer, mixed martial artist, kickboxer and actor who has fought for K-1 and DREAM. He is the younger brother of television personality and mixed martial artist, Bobby Ologun.
Kenichi Ogata[oɡata keɴiꜜtɕi]; born January 26, 1975) is a Japanese super welterweight shoot boxer, fighting out of Cesar Gym in Asakusa. He was the first Japanese national champion of shoot boxing at Super welterweight. He is the winner of S-cup in 2006 and the finalist of 2008 S-cup.
Hiroki Shishido is a Japanese welterweight shoot boxer, fighting out of Cesar Gym, Asakusa. He is a former 2004 S-cup world tournament finalist and WMC Intercontinental Super Welterweight champion.
K-1 World MAX 2005 Championship Final was a kickboxing event promoted by the K-1 organization. It was the fourth K-1 World MAX final for middleweight kickboxers, involving eight finalists and two reserve fighters, with all bouts fought under K-1 rules. All eight of the finalists had won elimination fights at the K-1 World MAX 2005 World Tournament Open, while the reserve fighters were invited despite suffering defeats. As well as tournament matches there were also three super fights fought under K-1 rules. In total there were sixteen fighters at the event, representing nine countries.
K-1 World MAX 2006 World Championship Final was a kickboxing event promoted by the K-1 organization. It was the fifth K-1 World MAX final for middleweight kickboxers, involving eight finalists and two reserve fighters, with all bouts fought under K-1 rules. Seven of the finalists had won elimination fights at the K-1 World MAX 2005 World Tournament Open, while the eighth, Virgil Kalakoda, had been invited despite losing his elimination match. The two reserve fighters had qualified via preliminary tournaments; Artur Kyshenko had won the K-1 East Europe MAX and Rayen Simson had won the K-1 MAX Netherlands. As well as tournament matches there were also a two opening fights and two super fights fought under K-1 rules. In total there were eighteen fighters at the event, representing nine countries.
K-1 World MAX 2003 World Tournament Final was a kickboxing event promoted by the K-1 organization. It was the second ever K-1 MAX final for middleweight kickboxers involving eight finalists and two reserve fighters, with all bouts fought under K-1 rules. The tournament fighters had qualified via preliminary tournaments, had been involved in the previous years final, or had been invited due to their achievements in kickboxing and Muay Thai. As well as tournament bouts there was also a super fight, also fought under K-1 rules. In total there were twelve fighters at the event, representing seven countries.
Kem Sitsongpeenong, formerly known as Khem Fairtex, is a Thai Muay Thai kickboxer and the reigning Thailand and WMC Muaythai super welterweight world champion.
Shoot Boxing – S-Cup 1996 was a shoot boxing event promoted by Caesar Takeshi. It was a qualifier for the Shoot Boxing World Tournament 1997, featuring four elimination fights with all bouts fought under Shoot Boxing Rules involving eight fighters from across the world. The eight finalists were a mixture of invitees or had been involved in the 1995 tournament.
Hinata Watanabe, or HINATA, is a Japanese welterweight kickboxer fighting out of Hiratsuka, Japan for the Shonan Kakuto Club. He is the 2008 R.I.S.E. champion currently competing in R.I.S.E. and K-1 MAX.
Jordan Watson is an English Muay Thai kickboxer who competes in the middleweight division. A powerful kicker, Watson began training in Muay Thai at six years old with Richard Smith at Bad Company, Leeds, UK and first came to prominence when he reached the final of the K-1 UK MAX Tournament 2007 Pain & Glory at nineteen. He won the ISKA World Super Welterweight Muay Thai Championship in 2010 and then found further recognition the following year by finishing as runner-up on The Challenger Muay Thai reality television show. He began fighting for Glory in 2012. He is the first ever and current Yokkao -70 kg champion.
Henri van Opstal is a Dutch kickboxer who competes in the middleweight division. Van Opstal came to prominence by winning the WMC European Junior Middleweight Championship but found further success competing in Japan, taking wins over a number of the countries' top middleweights and finishing as runner-up in the Shoot Boxing World Tournament 2012.
Tokyo, Japan 
Toby Imada - Invitee, Bellator Fighter (MMA), late replacement for Charles Bennett who was unable to participate due to legal issues
Henry van Opstal - Invitee, W.M.C. European Super Welterweight Champion
Buakaw Por. Pramuk - Invitee, 2004, 2006 K-1 World MAX Champion 
Rhyse Saliba - Invitee, W.M.C. Australian Super Welterweight Champion
Hiroki Shishido - S-Cup 2004 Runner-up
Jun Hyuk Song - Invitee