He debuted November 1959 when he was 30. He was billed at 1.85 m tall and 120 kg. He finished wrestling in 1981 when he was 51 years old. He was known for his technical style of wrestling.
Oki won the NWA International Heavyweight Championship on December 4 1972 from Bobo Brazil. Kintaro held it 3052 days and vacated it April 13 1981 (likely upon Oki's retirement). It remained vacant 13 days before being won by Dory Funk Jr. on the 30th.
- Signature moves
- Head butt
- Figure four leg lock
Championships and accomplishments
- All Japan Pro Wrestling
- Japan Wrestling Association
- Worldwide Wrestling Associates
- WWA World Heavyweight Championship (1 time)
- WWA World Tag Team Championship (1 time) – with Mr. Moto
- WWA International Television Tag Team Championship (1 time) – with Mr. Moto