Hei (Darker than Black)

Hei (黒（ヘイ）, pinyin: Hēi, lit. Black), also known as the Black Reaper (黒の死神 Kuro no Shinigami) or BK-201, is a human who gained Contractor powers. He has worked with various organizations including the Syndicate and CIA. He is the older brother of Bai.