Ishikawa

The was the one who founded Iwagakure in the Land of Earth. In the anime, he was also stated to be a member of the Kamizuru clan.

Background
At some point during his tenure, the Tsuchikage tasked a young Ōnoki with cleaning the Stone Monument of their village, under his direct supervision. During the exercise, he explained that the stone was a symbol of the tough, unmovable will of the shinobi of Iwagakure — something that he regarded as "essential". Although describing Ōnoki as possessing such a will, he warned how forsaking it would result in a life filled only with excuses and hatred.

Personality
The Tsuchikage seemed to be a composed individual, with wisdom and experience befitting of his age. By his own admission, he was able to discern the value of a stone and a person's will alike, by merely looking at them. As a consequence of this, he had a tendency to make reference to stones and their properties while speaking, aptly demonstrated during his advice to Ōnoki about discovering his innate strong will.

Appearance
During old age, the First had grown a bristling moustache and long beard, both of which had dark markings running through them. He also had a tendency to squint, otherwise only opening just one of his eyes when necessary. He wore the traditional Kage attire — consisting of the customary hat and cloak — over a dark, loose-fitting, full-length gown that was tied using a lighter sash around his waist.

Abilities
Though his capabilities remain largely unknown, the First has displayed the ability to fly like his successors. The anime also alluded to the fact that he may have used insect-based ninjutsu as his fighting style.

Search for Bikōchū Arc
In the anime, where his story is expanded on, it is revealed that 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.

Quotes

 * (To Ōnoki) "If you forsake your will while hitting a wall… you will begin to make excuses and obtain hatred in exchange of your determination. Listen now… you have to step forward without abandoning your will!"