Ishikawa

The was the one who founded Iwagakure in the Land of Earth. He has only been mentioned in the anime during Search for the Bikōchū arc.

Search for Bikōchū arc
After the Tsuchikage's death, his granddaughter, Suzumebachi, searched for his sacred scrolls which contained secret techniques on the bug-tamer arts. Ultimately, she was unsuccessful with finding her grandfather's scrolls. She and her brothers set out to find the bikōchū to help them, but are stopped by a group of Konoha ninja.