Myōbu

, more commonly known as the, is a conscious piece of Kurama's Yin-chakra, created by Kirigakure in an attempt to gain the Nine-Tails' power. It was first sealed within Ryun Uchiha, who himself was an experiment of Kirigakure's, ironically, on both's day of birth.

Background
Prior to the, tried to seize the power of the Nine-Tails for themselves. Nevertheless, like many before them, the village could not control the beast's power, and so resorted to stealing part of its Yin chakra to create a new life form. The experiment went horribly wrong when the fox went on a rampage of the village, even as an "infant"; causing massive damage. That same day, the bastard child of a kidnapped Uchiha soldier and a Kirigakure seductress was born; Ryun Uchiha. As a last resort, the First Mizukage sealed the beast within the boy, making him its jinchūriki.

Personality
Myōbu seems to be much more relaxed than Kurama initially was, lacking the blood-lust and murderous personality its progenitor had; almost seeming supportive of Ryun at times. This may be because the beast literally grew up within its jinchūriki, having been in a juvenile-like state upon being sealed within the infant Uchiha. According to Ryun, Myōbu was initially hostile towards him when both were still very young, but, having basically grown up together, the two quickly learned to become close friends over the course of Ryun's travels in the Land of Water. The fox seems to be at least aware of his status as a clone, and seems to be somewhat resentful whenever he becomes aware of the original's presence.

Myōbu has shown, however, to be haughty, arrogant, and proud of its own power; much like its original. In its younger days, it was overzealous in its attempts to lend Ryun its power, mainly to remind others that it was a threat not to be taken lightly. It also seems to enjoy bickering with Ryun over just about anything. Myōbu reacts violently to the feeling of Kurama's chakra, such as when Seireitou Hyūga, who had a portion of the beast's chakra within him, fought Ryun. Myōbu forced its chakra out of Ryun in large volumes as a show of force and animosity. It is unknown how Kurama reacts to this. Despite being a clone of Kurama, it has a sense of individuality apart from its original, having even given itself a personal name. Unlike other tailed beasts, such as, however, he doesn't mind his jinchūriki, or others, simply referring to him as the "Ten-Tails". Despite this, and very much like Son Gokū, it uses when referring to itself.

Appearance
Myōbu is exactly identical to the original Kurama, save for its far darker fur coloration, making it look almost black, and its tenth tail — a mutation caused by Kirigakure's experimentation shortly after it was split from the original. Even as a young fox, it was larger than most skyscrapers. In its current adult form, Myōbu is equal in height to most tailed beasts.