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.

"I am but a mere incarnation of Naraku that will die when he does. I have fullfilled my role. I have no regrets." - Byakuya.

Story
The time of his creation is left to speculation, but it was following the deaths of Kagura and Hakudoshi; Naraku was absent from the story for a while. This perhaps means, he was conducting trial and error in producing detachments and Byakuya is the final result.

Moryomaru Arc
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 Meioju 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. He left the wold dmeon's brother trapped by a moth demon of his creation, allowing Moyromaru to devour it; he fled soon afterwards as Inuyasha's group saved the pup.

Around this time, Naraku promised a demon (who used to be a human sage) a shikon shard in exchange for Inuyasha's death; this happened during a new moon. Byakuya captured the fleeing head of the demon in a web, taking back the shard in it, promising to gift it to the body that grew a new head if it succeeded. The demon was slain by Inuyasha, who gained the ability to purify the yoketsu sucked in by Dragon-scaled Tessaiga.

Trying to Complete the Jewel
When Kikyo was successfuly captured in Naraku's spider webs, allowing him to corrupt her, Byakuya was tasked with finding Kohaku and taking his shard. Meeting for the first time, Byakuya greeted the boy and attempted to kill him. However, he failed when Inuyasha's group rescued him.

He was later sent to give Naraku's orders to Kanna, who released her Mirror Demon to attack Inuyasha and steal Tessaiga's powers. Byakuya watched in confusion as Kanna took on the wounds her Mirror Demon would have, realising it was a walking voodoo doll. He laughed that his enemies should be trying to kill Kanna instead of trying to reason with her, temporarily thinking Kanna became angered by this. He then came to the conclusion Kanna had no heart.

He later came to the site of the battle between Shishinki and Sesshomaru, demanding the rock children tell him everything that happened there.

When Kohaku was left alone, Byakuya was ordered by Naraku to run interfernce to keep Sesshomaru and Inuyasha's group away long enough for him to get the shard. He summoned vines filled with miasma to block them, but Miroku sucked in the poison. When Inuyasha tried killing him, Byakuya quickly got out of the way, substituing himself with another doppleganger.

He is later tasked with gifting Sesshomaru with a shard of Kanna's Mirror Demon to allow Tenseiga to absorb Tessaiga's powers. He transported the brothers to another dimension to allow a peaceful battle while he watched with his eye demon. Naraku disgusted him by touching his eye socket to see what his eye was seeing.

Returning to where Naraku was hiding, Byakuta watched as his master conversed with the shikon jewel; a purple light swirled out of the jewel and peireced Naraku. A new being emerged from Naraku's body and took off. Byakuya assumed it was his younger brother, but Naraku told him it was the evil will of the demons trapped in the jewel, Magatsuhi. When Magatushi fails to return, Byakuya learns from Naraku that the demon had failed in the attempt to take Kohaku's shard and lost the temporary body given to it.

Byakuya later uses a piece of Magatsuhi]'s flesh to create an authentic illusion of him to lure Sesshomaru away from Kaede's village. When his ruse was discovered, Byakuya watched in amazment as all the demons he summoned were reduced to nothing mroe the pieces of corpses by [[Bakusaiga. He also was surprised that Sesshomaru had regrown his left arm.

The Final Battle
With the Shikon Jewel completed, Byakuya questioned what Naraku would do with it, only to learn he had no real plans past killing Inuyasha's group and Sesshomaru. Byakuya noticed that Naraku had defiled the jewel to the point where there was no more room for Magatsuhi to return. Naraku transformed and created a storm to suck in demons. Greeting Inuyasha's group as they arrived with Sesshomaru, Byakuya watched in amazment as they all went inside Naraku; logically, thye should have forsaken Rin to kill Naraku.

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 chose 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 also created an illusion of Magatsuhi, using a piece of flesh with its scent to make the illusion more believable. If injured, Byakuya loses concentration on his illusion, making it vanish; however, it would seem he can multi-task, having been talking to Kohaku while showing Sango an illusion.
 * Teleportation: When attacked, Byakuya substitutes himself with a flower, disgused as himself, and hides somewhere near by. 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.
 * Origami 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 pleases. If the vines are cut, miasma will pour out of them; it's potency is unknown given no one breathed it in and a potion prevented Miroku from feeling pain from sucking it.
 * Flight: As seen in Naraku: The Trap of Light, Byakuya can fly on his own without the aid of his personal barrier or origami cranes. He appears to move much faster when flying on his own.
 * 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.
 * Regeneration: He lost his left arm the moment Kagome shot off Naraku's. He later had it when Inuyasha used the Meido Zangetsuha to send him to Hell. It's most likely that unlike Hakudoshi and Naraku, Byakuya's recovery abilities are on the same as Kagura's and thus he needs time to recover.
 * Link to Naraku: Byakuya has said he will die when Naraku did. Only inside Naraku did Byakuya show signs of his life being directly linked to him. He lost his left arm when Kagome shot off Naraku's, and his face cracked when Bakusaiga began wreaking havoc on Naraku's body. However, he did not suffer injury when Naraku was being hit by the Meido Zangetsuha. This could mean that Byakuya suffers the same injuries as Naraku if the attack is powered by holy energy, and only cracks from other attacks.

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.