His codename is Hei, which means black in Chinese. Hei is a very talented contractor, his Messier Code is BK-201. Hei lives two lives in the series. In public he is Li Shengshun, a foreign exchange student from China. He is very nice and well mannered. He lives in the Umitsuki apartments and is always working a new part-time job.He has a huge appetite, not unlike most anime characters.

Hei's other life is of a Contractor called BK-201 and also the Black Reaper, mostly by other Contractors. Before becoming a contractor Hei was an assassin which earned him his nickname. Hei is usually seen on the job in a mask and a dark bullet proof coat.

Hei has the ability to manipulate electricity and can also disturb matter on a quantum level.

Rebecca – or Revy as she prefers others to call herself – is not the type of person anyone would want to cross. A member of the Lagoon Company, she is the one Dutch and the others turn to if they want someone dead really fast (there are rumors she committed several unsolved murders in New York City). She has an almost-passionate zeal for killing, and is often seen grinning maniacally during a shoot-out. Dutch once commented that Revy's personality was a little closer to Charles Whitman, the University of Texas sniper who went on a shooting rampage after murdering his mother in 1965.

Revy earned the nickname "Two-Hand" because of her ability to shoot with accurately with a gun in each hand... namely her customized chrome-plated Berettas. She also has a knack of being able to avoid bullets that are fired at her... traits the Chinese American picked up while surviving the mean streets of New York City before she made her way to Roanapur. She is also well-versed in other firearms, which range from grenade launchers to heavy sniper rifles.

Revy