Kadowaki Tatsuhiko The holder of the student Meijin, Honinbo and Juketsu, 3 titles. Kadowaki decided to become a Pro and test his skill by asking Hikaru a match. However was defeated by "Sai".

Kaga Tetsuo This delinquent is actually the captain of the Shougi Club. Though pretty skillful in Go, he always claimed that he hate Akira and Go. First Appearance: Volume 1, Chapter 7

Kaneko Masako Kaneko was "pulled" by Hikaru into Go club. In the end, she became the first captain of the girl's Go team. The "sworn enemy" of Mitani, perhaps?

Kaoru - see Kishimoto Kaoru

Kawai-san Taxi driver who loves Go. After defeated by Hikaru, he became Hikaru's supporter. He is also the one who brought Hikaru to Hiroshima.

Kimihiro - see Tsutsui Kimihiro

Kishimoto Kaoru The first captain of Kaioh Junior High Go club, also a former insei. Kishimoto was also the person who caused Hikaru's decision to become an Insei. Loves Black coffee.

Kouji - see Saeki Kouji

Koike Hitoshi Haze Jr High Go club youngest member, also the third captain in the team. Later, after Mitani etc had graduated, Koike was given the task to continue the Go club by himself.

Kojima Member of Kaioh Jr High Go club.He was one of those who wanted Akira to leave the Go club.

Kosuke - see Ochi Kosuke

Koyo - see Touya Koyo

Kurata Atsushi Famous in the Go Pro world as being one of the fastest learner. Kurata learnt Go for only 2 years and he was considered as one of the top Pros. Later, he gained interest in Hikaru's talent.

Kuwabara Honinbo The holder of Honinbo title. He wished to be the one who welcome the new wave in the Go Pro world. His sixth sense made him believe that Hikaru will be one of those new waves.