Kuyou

During the "Awakening" eight years ago, Kuyou served as a masterful strategist and was the one who suggested abandoning the north to the demon horde. As the representative official of Sacred Mountain, he is overseeing Souma's Hundred Demon Corps unit during his stay at Utakata Village.

A cold-hearted and ruthless realist, he is infamously known as the "demon who abandoned the north". His intelligence alone keeps him in the ranks.

(Source: Koei Wiki)