Voiced by: Mitsuaki Madono (Japanese), Michael Adamthwaite (English)

Byakuya (白夜?) is Naraku's final detachment, meant to replace Kagura, Hakudoshi and Kohaku. Like Kanna, he appears loyal to Naraku, doing as he is ordered. Originally, his purpose is to observe Inuyasha and Moryomaru's growing powers and report back to Naraku. Byakuya is a powerful sorcerer, usually employing the use of illusions; however, he has many others powers as well: he can possess people with paper soldiers, summon vines to entrap his enemies, teleport others to different dimensions, turn his left eye into a winged demon for recon, and much like Naraku, the Infant and Hakudoshi, fly in a barrier. He travels on a giant crane-shaped origami in a similar fashion to Kagura's expanding feather ornament, despite being capable of flight without it. While linked to Naraku like Hakudoshi and the Infant, Byakuya's connection is strong to the point that he loses parts of his body whenever Naraku does. He carries a blade-less sword, meant to absorb the power of Inuyasha's sword and use it against his foes. After taking the power of one slash of Inuyasha's Tetsusaiga, Byakuya slashes Kagome to inflict her with a time delayed Meidou before being absorbed by Inuyasha's Meidou Zangetsuha.

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