Busoshoku: Kanri

Busoshoku: Kanri (武装色 管理, Busō-shoku: Kanri; literally "Color of Armaments: Deployment") is the method of regulating the output of. Within the Haki Development System, it is classified as a Fourth Dan level technique. When one further develops control over Haki, they become able to control how much of it is imbued at one time, allowing them to regulate how much Haki they are using without making unnecessary expenditures.

Overview
When one is first learning how to harness Haki, or more specifically, Busoshoku Haki, they are only able to do so in sudden bursts. In the words of Kurama, they can usually only go to zero or one hundred percent in output. Novices can only imbue their body with a complete armament or none at all, due to still requiring more practice with the technique. As had said once, long ago, Haki is a flower that blooms only in adversity. Therefore, learning how to regulate Busoshoku Haki cannot be taught, it must be developed through sufficient experience.

By learning to control the output, much like tempering a flame, the amount of Busoshoku Haki being imbued at any instance can be refined and controlled as the user requires. When Busoshoku is used at one hundred percent, the aura quite literally "snaps into rigidity", but when the output is regulated and put out at even lower amounts, even at around seventy or eighty percent instead, the rigidity of the body is reduced while still maintaining some semblance of heightened defense. When this is done, the appearance of the armament resembles the usual black coloration but sports flame-like patterns on the outer edges of where the Haki was imbued. It is even noted to have lighter hues than the solid hue coloration of the full-strength armament. The user essentially learns to put out only as much Haki as is needed in any given situation; for individuals faced with weaker opponents, perhaps not much Busoshoku is needed to fend off their assault.

However, for and  users, regulation of Busoshoku provides fringe benefits. By controlling how much Busoshoku is imbued, they can still shield themselves and strike with the power of Haki, while maintaining the fluidity and uniqueness of their Devil Fruit-altered bodies. In the case of, his body maintained its rubbery constitution even while covered in the armament Haki, allowing him to produce the technique as a result. was also able to cover his arm in the armament Haki while still keeping it sticky as per his abilities.

Behind the Scenes
While this is a concept that was found in the One Piece manga and anime, it is possible to say that the ideas found on this article were also partially inspired by how the output of Nen works in the anime and manga series, Hunter x Hunter.