Gyokumen Koushou

Gyumaoh's concubine and the mastermind of the plan to revive him. She's extremely cruel and selfish, and has shown to be willing to sacrifice anything to get what she wants, and is shown to enjoy her cruel acts. Has told Kougaiji that she'll only restore his mother to life if he helps her obtain the Five Sacred Scriptures (or Sutras). Despite being Lirin's biological mother she cares nothing about her own daughter and only sees her and Kougaiji as tools.

(Source: Saiyuki Wiki)