Kage

is a title reserved for the leader of one of the Five Great Shinobi Countries' hidden villages. They are collectively known as the. A Kage oversees the activities of their village, from sending ninja on missions to making the hard decisions regarding the safety of their people. A village's Kage is generally acknowledged as its most powerful ninja.

Overview
Each village has its own name for its Kage: As a Kage's primary concern is their village, interaction between the Kage is rare; only during treaty-signing ceremonies or shared public events has a Kage been seen to interact with one of his or her peers. The only time that all five Kage are together is during a Kage Summit, which can be convened by any of the five to discuss topics that apply to all of their villages.
 * The of Konohagakure.
 * The of Sunagakure.
 * The of Kirigakure.
 * The of Kumogakure.
 * The of Iwagakure.

How a Kage is appointed appears to differ from village to village. In Konoha, the Hokage typically appoints their successor. If the Hokage dies or is otherwise incapacitated before they can choose a successor, the selection falls to the Land of Fire's daimyō, although that appointment must then be approved by the rest of Konoha's ninja. In Kumo, after the Third Raikage died, his son automatically became Fourth Raikage, a decision made many years earlier. If a Kage should ever choose to retire they will keep their title for the rest of their life, and can assist the new Kage with decision-making and other responsibilities. A retired Kage can even return to full-time leadership if their successor dies, as the Third Hokage did when the Fourth Hokage gave his life to save Konoha, being unable to find anyone worthy and willing to take on the title of Fifth Hokage at the time.

Because jinchūriki are so important to their village, it is tradition for a jinchūriki to be a relative of the current Kage, both to strengthen the jinchūriki's loyalties to the village and to display the Kage's might. For example, Killer B is the adoptive brother of the Fourth Raikage, Gaara is the son of the Fourth Kazekage and Naruto is from the same clan as Mito Uzumaki the granmother of the fifth Hokage.

Trivia

 * The Third Hokage was considered to be the strongest of the Five Kage of his time.
 * In the anime, Hoshigakure has unofficially dubbed each of its leaders the, signifying their ambition for Hoshigakure to be recognised as an equal to the hidden villages of the Five Great Shinobi Nations.
 * Tsunade is the first Kunoichi in history to hold the title of Kage.