Chikage Kazama

Member of the Bakumatsu, enemies of the Shinsengumi. He is the strongest Oni of the West and is after Chizuru, so that they can mate and create stronger Oni. His reasons for this are unknown, but his attempts to take Chizuru have so far been thwarted by the interference of the Shinsengumi. Despite being arrogant and cynical, he is not entirely cold-blooded, as he later saves Chizuru, although this might have been for his own purposes. Kazama is usually followed by his two demon companions Amagiri and Shiranui, and it is implied that he might be of royal blood, like Sen-hime. In his Oni form, he grows white horns and his hair fades to match. His eyes also become yellow.

Visual Novel Spoilers

(Source: Wikipedia, edited)