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 one point in time during his time as Tsuchikage, he had tasked a young Ōnoki with cleaning the Stone Monument of their village. He explained to Ōnoki that the stone was a symbol of the tough, unmovable will of the shinobi of Iwagakure and that Ōnoki too possessed this will.

Personality
The Tsuchikage seemed like a calm individual with wisdom befitting his age. He stated that he was able to tell the value of a stone as well as a person's will by just looking at them and offered a young Ōnoki advice about finding his own strong will. He also had a tendency to make reference to stones and their properties while speaking.

Appearance
The First was an old man with a bristling moustache and a long beard which had dark markings running through them. He had a tendency to squint or else only open one of his eyes. He wore the traditional Kage attire which consisted of a loose-fitting gown with which he wore a sash around his waist and over his shoulders. He also used the customary Kage hat.

Abilities
Though not much is known of his abilities, 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!"