|Ring name(s)||Kobayashi Kuniaki|
|Real name||Kobayashi Kuniaki|
|Billed height||180 cm (5 ft 11 in)|
|Billed weight||108 kg (240 lb; 17.0 st)|
New Japan Pro-Wrestling (1972-1984)
Like many rookies were, he was sent to Mexico in 1980.
In 1982, he went to the Los Angeles territory where he wrestled under the name Kid Koby and won the NWA Americas Heavyweight Championship.
After he returned to Japan in 1982/10, he had a feud with the original Tiger Mask. Because of his "antiheroic" actions in the ring, he was regarded as the "Tiger Hunter". Kobayashi also allied with Chōshū Riki, Masa Saitō, and Killer Khan as a part of the Kakumeigun and later Ishin Gundan.
All Japan Pro-Wrestling (1984-1987)
In 1984/9, Kobayashi, along with other Ishin Gundan members, left New Japan and formed Japan Pro-Wrestling which made a working agreement with All Japan Pro-Wrestling. While wrestling for All Japan, he feuded with the second version of Tiger Mask, Misawa Mitsuharu. He won NWA International Junior Heavyweight Championship in 1985 and World Junior Heavyweight Championship in 1986.
New Japan Pro-Wrestling (1987-2000)
Chōshū, Kobayashi, and some of the Japan Pro wrestlers returned to New Japan in 1987. He won IWGP Junior Heavyweight Championship in 1987/8. He also served as the first opponent for Jūshin Liger under this persona.
Around this time, Kobayashi had two colorectal cancer surgeries. In 1999, he had surgery to battle liver cancer. The Heisei Ishingun dissolved in the same year, and Kobayashi had his last match on 2000/4/21 against Jūshin Thunder Liger. Sayama was one of the guests for the retirement ceremony, and Misawa also sent a message.
Since the retirement, Kobayashi has remained involved in puroresu, currently as caretaker of the New Japan Dōjō. He occasionally wrestles in legends matches.