Byakuya

is Naraku's ninth and final detachment, meant to replace Kagura. His main purpose is to observe Inuyasha and Mōryōmaru's growing powers and report back to Naraku.

He originally appears when Inuyasha fights a poisonous demon that swallowed some of Mōryōmaru's flesh and gained power. Byakuya created illusions to distract Inuyasha and allow the demon to flee. He appeared before Inuyasha to introduce himself, right after telling the demon where he was. Byakuya watched as Inuyasha slayed the demon and was hit by a backlash of energy from Tessaiga. He warned that if another enemy was around, Inuyasha would be dead. Byakuya took his leave to report back to Naraku, commenting that because his orders were to simply observe, he didn't kill Inuyasha when it was easy.

Byakuya next appears right after Meijo is ressurected by Mōryōmaru to gain a powerful armor. At that time, he met Sesshōmaru, who, just like Inuyasha, attacked him because he smelled like Naraku. When Mōryōmaru got the armor and Diamond Spears of Tessaiga, Byakuya was order to distract Sesshōmaru to allow Meijo to escape. Escaping death, Byakuya explained he was simply doing his job.

On Naraku's orders, he attacked the wolf demon tribe and gave a young pup a Shikon shard to lure Kōga to him. He succeeded in luring in his prey, but was forced to flee once more when Inuaysha's group arrived to help. Mōryōmaru was caught in the middle of the skirmish and took the shard from the wolf demon child.

After Naraku gained the ability to create webs, Byakuya was tasked with finding and killing Kohaku for his shard. He kept trying, but failed.

After taking the power of one slash of Inuyasha's Meidō Zangetsuha, he thinks to himself that the end is near, informing us that he knew he was going to die like the other incarnations. When Shippō sees him take the Meidō Zangetsuha's demonic energy, he is aware, but he doesn't capture Shippō; in fact, he informs him that he has a chance to get out of Naraku's body alive. Later, Byakuya slashes Kagome with the blade that contained Meidō Zangetsuha's demonic energy. However, before he gets a chance at a second strike, Inuyasha attacks him with his Meidō Zangetsuha and Byakuya is absorbed into it, but not before he states that he has fulfilled his purpose, and that he has no regrets. When Naraku dies, a Meidō appears behind Kagome, due to Byakuya's Meidō Blade.

Appearance
Similar to a moth Yokai, Byakuya has pale skin with purple eyes; he also has black hair, which tied in a ponytail. Also his lips appear to be painted red. His outfit consists of a light blue haori with red patterns on it. Byakuya wears brown hakama with them. He also wears a dark blue vest with yellow markings on it. He keeps his bladeless sword tied to his back along with his gourd. .

Personality
Byakuya appears playful and polite, introducing himself to other and expecting the same courtesy; he loathes how Sesshōmaru tried killing him without even an introduction. Logical and observant, Byakuya doesn't want to arouse the anger of someone he knows can kill him, like Sesshōmaru. He is willing to kill others Naraku hates, but won't go against his orders. He is willing to help others, even his enemies; he gifted a shard of Kanna's mirror to Sesshōmaru and told Shippō how to escape Naraku. He'll often voice his opinions, such as when his opponents do something stupid; Inuyasha could have killed Naraku with the Meido Zangetsuha, but choose to go inside him to rescue Rin.

Powers & Abilities

 * Illusions: By blowing dew off a blade of grass, Byakuya is able to create a multiplication illusion. He can also create multiple, similar, illusions (specifically of Naraku) in different places; however, Byakuya comments that it's a lot of hard work. Byakuya has also created an illusion of Magatsuhi, using a piece of flesh with its scent to make the illusion more believable.
 * Teleportation: When attacked, Byakuya substitutes himself with a flower and hides somewhere nearby. He can also teleport without a substitute. As seen in Naraku's Uncertain Wish, Byakuya holds out a flower before teleporting away, perhaps meaning they're a medium for this ability.
 * Barrier: Like Naraku, the Infant and Hakudōshi, Byakuya has the ability to create and fly in a barrier for his own safety if flying on his origami crane is too dangerous at the time.
 * Magic gourd: Byakuya has been seen using a gourd for two purposes. Firstly, he can splash water from it to create a miniature moon around his targets to send them to another dimension. Secondly, he can store other objects, such as a piece of flesh from the body Magatsuhi for an authentic scent.
 * Orgami control: His most commonly used ability, Byakuya uses it to create a paper crane to fly on after enlarging it, similar to Kagura's feather. He can also manipulate cut-outs of people for covert observation, and can possess others by simply attaching his paper to them. Byakuya can also remotely control smaller paper cranes to distract enemies. He also possess reflective sheets, which can send light anywhere he pleases.
 * Detachable Eye: Byakuya can detach his right eye at will, turning it into a flying eye demon, which he uses to spy on enemies; it's resistant to the pull of a Meido, being able to avoid being sucked into the Underworld. Naraku can see what Byakuya does by touching his eye socket, something Byakua finds "disgusting"; in a way, this serves as a replacement for Kanna's mirror.
 * Nature Control: Though only seen once, Byakuya has the ability to manipulate vines and make them burst from the ground where-ever he chooses. If the vines are cut, miasma will pour out of them; the potency of this miasma is unknown given no one breathed it in and a potion prevented Miroku from feeling pain from sucking it.
 * Flight: Even though he can fly on his origami cranes and in a personal barrier, Byakuya has been seen to fly on his own without any aid; seen in Naraku: The Trap of Light.
 * Technique Absorption: Byakuya posses a blade-less sword that can absorb demonic energy. It was used to sample the Meidō Zangetsuha. The purpose of this attack is still unknown, as the Meidō opened up behind Kagome some time after Naraku was defeated. Byakuya has stated that he can only do this once.
 * Link to Naraku: Like Hakudoshi before him, Byakuya is linked to his creator; however, his connection is lot more serious. During the final battle, Kagome shot off Naraku's left arm and Byakuya lost his at the same time. When Bakusaiga was reeking havoc on Naraku's body, Byakuya's face started to crack. Upon being hit by a Meido, Byakuya commented he would die when Naraku did.

Trivia

 * As Kagura, Hakudōshi, Akago, and Kohaku betrayed Naraku at the same time, Byakuya basically replaces all of them; this perhaps is the reason he is so powerful.
 * His outfit bears similarity to Naraku's before fleeing to Mount Hakurei.
 * There is strong evidence that suggests that Byakuya might be a moth yōkai. Firstly, Byakuya has many of the same powers as other moth yōkai, such as the creation of illusions, insect control, and nature manipulation. He also bears a close resemblance to other moth demons, such as Gatenmaru and Garamaru, particularly his long hair and colored lips. If this were true, it would be Naraku's first and only incarnation that was a member of a particular subspecies of yōkai; all of his other incarnations (with the slight exception of Goshinki, who was nevertheless just an oni) were standard humanoid yōkai and not aligned with any particular animal-derivation; ironic, considering that Naraku is a spider hanyō.