Riki

A mongrel - has black hair, dark eyes, and an attitude. He's not tall - only 175 (the only one shorter is Killie... but he's probably still growing), but is very well built. In Ceres, he was the leader of a gang called Bison and did some work for Katze in the Black Market, where he was known as Riki the Dark. He was 17 when Iason made him his pet, and in the end of the story he is about 21.