Kyokushin (極真) is a style of karate originating in Japan. It is a full-contact style of stand-up fighting and is rooted in a philosophy of self-improvement, discipline, and hard training.
Adam Keith Watt is an Australian martial artists, former boxer and kickboxer. He has studied many forms of martial arts, kickboxing, Zen Chi Ryu, Seido-kaikan karate, and boxing. His nickname was "Lights Out" because of his high level karate and boxing skills, and one punch knock out power. He has won many world kickboxing titles, and reached as high as 10th in the highly respected World Boxing Council's & World Boxing Organisation's Cruiserweight ratings. In 2000, he challenged WBO cruiserweight champion Johnny Nelson for his title. Watt holds the notable distinction of being the first athlete to fight for world Karate, kickboxing and boxing titles.
Ray Sefo is a New Zealand fight promoter and retired kickboxer, boxer, and mixed martial artist. He was the K-1 World Grand Prix 2000 Runner-up, is a six-time Muay Thai World Champion, and was an eight time K-1 World Grand Prix Finals tournament participant. He is the president of MMA promotion Professional Fighters League. In kickboxing, he defeated world champions Jerome Le Banner, Peter Aerts, Stefan Leko, Mike Bernardo, and Mark Hunt. He is widely considered to be one of the greatest heavyweight kickboxers to have never won the K-1 World Grand Prix. As mixed martial artist, he most notably competed in the now defunct Strikeforce in 2009 and 2011.
Jérôme Philippe Le Banner is a French kickboxer, mixed martial artist, and professional wrestler. Le Banner fought for most of his career in K-1 and became known for his aggressive fighting style and knockout power. He is a 2-time K-1 World Grand Prix runner up, a 2-time K-1 Preliminary Grand Prix champion, and is a multiple time world champion in Kickboxing and Muay Thai. He holds notable victories over Ernesto Hoost (twice), Francisco Filho, Mark Hunt, Sam Greco, Mike Bernardo (twice), Peter Aerts, Rick Roufus, Remy Bonjasky, Tyrone Spong, Stefan Leko (twice), Masaaki Satake, Maurice Smith, Gary Goodridge (twice), Musashi (twice), Cyril Abidi and Choi Hong-man (twice).
Andreas "Andy" Hug was a Swiss karateka and kickboxer who competed in the heavyweight division. Considered to be one of the greatest heavyweight kickboxers of all time, Hug was renowned for his ability to execute numerous kicking techniques rarely seen in high-level competition. Although he was usually smaller than his opponents, standing at 1.80 m and being barely a heavyweight, weighing around 98.0 kg in his prime, he made up for his lack of size with his tremendous athleticism and speed. A southpaw, his trademark kicks included the axe kick and the "Hug Tornado", a low spinning heel kick targeting his opponents' thighs.
Kazuyoshi Ishii is a Japanese master of Seidokaikan karate and founder of the K-1 fighting circuit, a widely televised international martial arts competition combining Muay Thai, karate, sanshou, taekwondo, kenpo, boxing, and kickboxing. His karate training began with Kyokushin karate, but he formed his own karate organization in 1980, began promoting televised karate competitions, and started staging K-1 events in 1993.
Nobuaki Kakuda is a retired karateka and kickboxer and former K-1 Head referee.
Masaaki Satake is a Japanese former heavyweight karateka, kickboxer, professional wrestler and mixed martial artist. He is one of the pioneering heavyweight fighters in K-1, having been a member of Kazuyoshi Ishii's Seidokaikan school.
Peter Graham is an Australian karateka, kickboxer, boxer and mixed martial artist.
Pierre Alain Ngalani is a Cameroonian-born Hong Konger mixed martial artist and Muay Thai kickboxer who most recently fought for ONE Championship, where he competed in the Heavyweight division. He is a four-time Muay Thai World Champion.
Francisco "Chiquinho" Alves Filho is a Brazilian Kyokushin Karateka and kickboxer. He is one of the few karate-ka to have successfully completed the 100 man kumite more than once.
Seidokaikan (正道会館) is a traditional full contact karate derived from Kyokushin by Kazuyoshi Ishii. Seidokaikan organized the first professional full contact karate tournament named the Karate World Cup. The Karate World Cup had special extension rounds; if the judge's decision was deadlocked after an extension round, the rules then allowed face strikes with fighters donning boxing gloves (kickboxing).
Ewerton Teixeira is a Brazilian professional kickboxer, mixed martial artist, and Kyokushin Kaikan karateka. Teixeira obtained his first K-1 title in 2008 at K-1 World Grand Prix 2008 in Fukuoka by beating Keijiro Maeda in the final. He is training K-1 at the Ichigeki Academy Kyokushin Kaikan in Tokyo, Japan. Despite the short career for a kickboxer, Teixeira has notable wins against K-1 legends: Jerome Le Banner, Errol Zimmerman and Musashi.
Tomasz Kucharzewski was a Polish-Canadian martial artist. Kucharzewski initially gained fame while fighting competitively in Kyokushin kaikan and Shidōkan styles of karate. Though greatly successful in karate, he became more involved in kickboxing during his later career. A dominating force in the ring, Kucharzewski was described by the veteran karate instructor and journalist Roger Salick as "indestructible" following his fourth International Shidōkan Championship wins. He held notable victories over Glaube Feitosa and international karate champion Gerry Marketos.
Petr Vondráček is a heavyweight kickboxer. He is a former WKA World Champion.
Jan Soukup is a Czech karateka, the branch chief for International Karate Organization Kyokushinkaikan in Czech Republic, the president of the Czech Kyokushin Karate Association and the vice president of the Czech Fullcontact Karate Organization, and also a retired kickboxer who competed in the heavyweight division. Soukup's first noteworthy accomplishment was a third-place finish at the European Kyokushin Championships in 2003 and he followed this by winning the All-Japan Kyokushin Championships the next year. After finishing as runner-up in the European Championships and in third place in the European Open in 2005, Soukup had his most successful year in 2007 when he won the European Championships and lost to Ewerton Teixeira in the final of the 9th Kyokushin World Open. Beginning in 2008, he embarked on a career in kickboxing which included a stint in K-1.
Michael Thompson is an English former karateka and kickboxer who competed in the cruiserweight and heavyweight division. After a long and distinguished career in Kyokushin, in which he won the British Open four times, the Commonwealth Championships in 1988 and the European Championships in 1991 as well as competing three times in the World Open, Thompson later switched to Seidokaikan and reached the final of the 1994 Seidokaikan Karate World Cup. During his time as a Seidokaikan competitor, he also fought as a professional kickboxer in K-1, amassing a 6–5 record and becoming the WKA European Super Cruiserweight Champion.
Shidōkan (士道館) is an eclectic style of knockdown karate, founded by Yoshiji Soeno. Established in 1978, its governing body is the World Karate Association Shidokan, with its headquarters located in Ito City, Shizuoka Prefecture. Currently, it has branches in 68 countries.
Kūdō is a Japanese hybrid martial art. It is a full-contact combat sport that aims to achieve safety, aggression, & practicality, a style of mixed martial arts practised with headgear and gloves. It features stand-up striking, with throwing and grappling techniques being also allowed in the competition, including restraint, locks and chokeholds.
Peter Graham 
Ernesto Hoost 
Mirko Cro Cop 
Ray Sefo 
Stefan Leko 
Mike Bernardo 
Samir Benazzouz
Andy Hug 
Matt Skelton 
Jérôme Le Banner 
Francisco Filho 
Jean-Claude Leuyer 
Musashi 
Perry Telgt
Vjatcheslav Soukhanov
