Kishima Kouma

Kouma is a result of mixing bloods in many generations, someone who shouldn't have been born. He was like an abandoned child, whom no one wanted to take care of. So close to people, yet so far from them. Just like Mowgli, he would have rather been among the animals, than the humans.

Spoiler

Kouma was the one who killed Nanaya clan, but spared Shiki's life for some reason.