|Manga||Chapter 00: Black Lagoon|
|Anime||Episode 01: The Black Lagoon|
|Japanese Anime Voice||Taiten Kusunoki|
|English Anime Voice||Mark Acheson|
Boris (ボリス, Borisu) was Balalaika's second-in-command.
He could be easily identified by the large scar running from the right side of his forehead to his left cheek.
Like Balalaika, he had served in the former Soviet army in the Afghan Civil War. She still referred to him as "Sergeant" rather than by his name, suggesting that he was her former platoon sergeant. He was very loyal and protective of Balalaika and often worried for her safety when she decided to fight in the field.
He was a calm, broad-built man with a deep Russian accent.