Kazama, Chikage

風間千景

A member of the Bakumatsu and an enemy of the Shinsengumi, he is the strongest Oni of the West. He pursues Chizuru so that they can mate and produce stronger Oni. His motives for this are unknown, but his attempts to take Chizuru have so far been thwarted by the Shinsengumi's interference. Although arrogant and cynical, he is not entirely cold-blooded; he later saves Chizuru, though this may have been for his own purposes. Kazama is usually accompanied 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, while his eyes turn yellow.
Video Game Spoilers
[spoiler]In the otome game that the anime and manga were based on, Kazama is one of the six characters that Chizuru could end up with based on the player's decisions throughout the game.
It's stated in the game that Kazama is of pure demon blood and he's the head of the Kazama family that reigns over the west. The reason why he's after Chizuru is because she too is of pure blood, and if they mated it will result in an even more powerful demon child.
His route in the game also reveals that he's a man with a high sense of honor, and the reason why he sided with Satsuma was to return the debt for protecting his clan during the demon extermination issued by the shogun. It's also stated that the reason why he attempts to kidnap Chizuru only when she's under the protection of the Shinsengumi is because he wants to shame the Shinsengumi after defeating them in a clean fight, of which Sen comments that he's acting like a classic villain.

Spoiler