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 has an incredible power to create illusions, but has many other powers as well: he can possess people with paper soldiers, summon vines to entrap his enemies, teleport others to different dimensions, detach organs from his body, and erect barriers. He travels on a giant origami paper crane.
After taking the power of one slash of InuYasha's Meidou Zangetsuha, he later slashes Kagome with the blade; however, before he gets a chance at a second strike, InuYasha attacks him with his Meidou Zangetsuha and Byakuya is absorbed into it. When Naraku dies, a Meidou appears behind Kagome, due to Byakuya's Meidou Blade.
