|Affiliation||Asahi Heavy Industrial|
|Manga||Chapter 00: Black Lagoon|
|Anime||Episode 1: Episode 01: The Black Lagoon|
|Japanese Anime Voice||Jouji Nakata|
|English Anime Voice||Ross Douglas|
Kageyama (景山, Kageyama) was the department chief of the materials and procurement department where Rock was working while with Asahi Heavy Industrial. Following the abduction of Rock by the Lagoon Company he hired the Extra Order Mercenary Group to pursue them and reacquire a disc with information about nuclear weaponry. After the mercs failed, he got the disc back from Balalaika. While leaving, Rock quit and turned around beginning his new life. He returned to his house in Japan. His wife asked him to talk to their first daughter because she was staying out much later that she would have liked. He replied by saying that it was his wife's job to speak to and adequately educate her. He is known to have a second son in high school named Takanori, a third daughter, and a Golden Retriever named John, who he shows genuine affection toward.