Yamikage

The Yami kage ( 闇影 ,  Literally meaning: Dark Shadow) is the  Kage of  Kurogakure, a title bestowed on the village's leader. The Yamikage position is filled by the strongest person in the village, regardless of considerations such as age.  The Yamikage's building is the largest landmark in Yamigakure, bearing the kanji for Yami  ( 闇 ,  Literally meaning:Darkness) on it.

First Yamikage
Main article: Ryun Okayado

Ryun Okayado was the First and Only Yamikage (最初闇影, Literally meaning: First Dark Shadow) who founded Kurogakure in the Land of Darkness and was the leader of the Okayado Clan. He was elected by his people to be the first Yamikage.

Enzo Okayado
Main article: Enzo Okayado 

Enzo Okayado was born in Kurogakure but was brought to Kirigakure by his adoptive-mother Yoko Terumi. He left the village after her death and his chakra rebuilt Kurogakure and Sayuri Okayado declared him as the Second Yamikage (第二に闇影, Literally meaning: Second Dark Shadow) who is considered to be the village's strongest Yamikage.