Koichi Ishii | Koichi Zenigata | Koichi Wakata | Koichi Wajima | Koichi Sakamoto | Koichi Nakamura | Koichi Domoto | ''Ruddock with Koichi Tohei Sensei in Iidabashi dojo (photo by Henry Kono)'' | Koichi Yamaguchi (bicycle framebuilder) | Koichi Yamaguchi | Koichi Tohei | Kōichi Tōchika | Koichi Tanaka | Kōichi Tabuchi | Koichi Sasada | Koichi Ohata | Koichi Nakano | Kōichi Morita (songwriter) | Kōichi Morita | Koichi Kato |
When he played in Nippon Series on November 1, 2012, Kazuhito Tadano was thrown out of the game because Koichi Yanada, the umpire-in-chief in the game, judged that Tadano threw bean ball to his face.