Kensaku Shiraishi (白石 謙作 Shiraishi Kensaku) was the original Battle Cossack (バトルコサック初代 Batoru Kosakku Shodai) of Battle Fever J before his tragic death. He was the original second-in-command until his death and Makoto Jin took his place while Kyousuke Shida became the new second-in-command.