Takiko Souma
She is the last remaining direct member of the main house of the Souma family who are implied have royal origins as will as being a shrine maiden. The Souma Clan like Kurahashi Clan once supported Yakou during WWII and through their control of military. However when Japan lost the war they had all but disappeared. Spoiler Atsune Hirata was her other identity. Spoiler While she is one of older members of Twin Horn Syndicate, Takiko consider herself different from the current Yakou Disciples because she seeks to fulfill his will and ideals which the organization was founded on. She is secretly allied with Genji Kurahashi to achieve this desire and cleanse Twin Horn Syndicate of its mindless fanatical elements by awakening Yakou within Natsume. (Source: Wikipedia, edited)