Seiryū

Seiryu is a snake demon who worked under Hoshiyomi to recover the Naginata of Kenkon. He tricked Kagome by disguising himself and the other ninjas (including Suzaku of the Flower, Genbu, and Byako) as Kagome's friends, Ayumi, Eri, and Yuka. Seiryu, like Byako, eventually was killed by Miroku's Kazaana.