Kokuō(Flamemasterjoy)

The Tetsukage (Literally meaning Iron Shadow) is the leader of Tetsugakure and is typically the strongest shinobi in the whole village.

Like other ninja villages, the new Tetsukage is elected by the old Tetsukage once he retires. If the old one was to die or be incapacitated before choosing his successor, the Crystal Daimyō would appoint a shinobi as the Tetsukage upon recomindation by the village's Jonin council. Afterwards, the candidate will need to be approved by the jōnin of the village to become the official Tetsukage.

First Tetsukage
Fuku became the "First Tetsukage"' after forming the village with the clans he had meet on his journey He set up the laws of the village and the way of life for the shinobi.