Of the three Kai brothers, Kurotora is the most aggressive. In his past, Kurotora lost his eye from Martin the murderer as a pup. Ben later chased off the murderer and saved the Kai brothers. At the first meeting of the Ou pack he is nearly drowned when Gin makes him his opponent. Later on in Shikoku he is buried in the ground as part of a trap for Ou dogs by Bill and Sniper's pack on Shikoku island. Kurotora wouldn't have been caught if he ran away, instead he stayed and fought with the dogs because he refused to turn his back on an enemy.
In Ginga Densetsu Weed Kurotora is the father of three sons - Kagetora, Nobutora and Harutora. He is also taking care of Chutora's four sons, Dodo, Buru, Shigure and Shouji.