|Affiliates|| Revy |
|Affiliation||The Lagoon Company|
|Manga||Chapter 00: Black Lagoon|
|Anime||Episode 01: The Black Lagoon|
|Japanese Anime Voice||Daisuke Namikawa|
|English Anime Voice||Brad Swaile|
Rokuro Okajima was born in the 49th year of the Showa period according to the manga, which corresponds to 1975-1976. Not much is revealed about his past until the Fujiyama Gangsta Paradise arc where he tells Revy that he was raised in Tokyo with a family that did not care much about him. He has a mother, father, and an older brother who was academically capable and landed a job in the Japanese government, whereas Rock entered college one year late, and his family significantly lowered their expectations of him.
He worked for Asahi Industries in the beginning of the series where he is introduced as an unremarkable, meek white-collar salaryman who was constantly bullied by his superiors and felt trapped in his empty life of routine and submission. During a business trip in the South China Sea, the ship he travelled on was hijacked by the Lagoon Trading Company to retrieve a data disk he carried; as they departed he was taken hostage by Revy, much to Dutch's disapproval. It is also here that Rokuro is given his nickname 'Rock' from Dutch by playing on the phonetic pronunciation of his name.
Instead of being rescued or ransomed, his department chief, Kageyama, abandons Rock in an attempt to cover up the smuggling operation in which he had been an unknowing participant. Kageyama sends out a group of mercenaries to kill Rock and the Lagoon Company to destroy the disk; but Rock, even though he never experienced combat, manages to help the Lagoon Company defeat the mercenaries with a ridiculous plan of his by using the Black Lagoon's anti-ship torpedoes to shoot down the mercenaries' attack helicopter. Having been invigorated by the experience of piracy and unwilling to return to his boring life in Japan (and that he has already been declared dead by his superiors), he decides to stay in Roanapur and joins the crew of the Black Lagoon.
Rock is a humble and good-natured person despite being on the business end of guns from friends and foe alike, and often seems surprised at the barbarity of the Southeast Asian crime world. He wears a teal neck tie, short-sleeved dress shirt, slacks, and dress shoes since even though he is a pirate, he retains his business persona. He is not a fighter in any way but a pacifist who prefers to use words over weapons when interacting with the hostile people encountered on the job. Rock, from joining the Lagoon Company, has often wondered if he is experiencingStockholm syndrome, consequentially developing a friendship with his former captors and co-workers.
Within the Lagoon Company, Rock is usually responsible for account management, diplomacy, negotiation, translation, interpretation, and running occasional errands. Having worked in the resource department of Asahi Industries, Rock is skilled in geology and chemistry. He is also a skilled linguist due to frequent traveling from his previous job, able to speak in Japanese (his native language), English, Spanish, Romanian and Russian. He also has a surprisingly high tolerance for alcohol, owing to the heavily drinking lifestyle of a ladder climbing salaryman.
Rock's earnest personality has earned him the interest and respect of several characters in Roanapur, including Balalaika, Mr. Chang, Rowan "Jackpot" Pigeon, Yolanda, Eda (who develops a crush on him), and the young Garcia Lovelace, whom he trusts to the greatest degree. In many ways, Rock is the heart of the Lagoon Company, serving as a balance for his more jaded teammates and as a bright spot in the world of darkness that is Roanapur. He retains a strong sense of right and wrong, trying to hold on to and share his beliefs with others in Roanapur. He is often shocked and horrified by how people suffer from the injustices of the criminal underworld despite his best efforts, wearing him down as the series progresses. Although physically weak and unarmed, Rock has shown tremendous courage to stand up for himself, others, and for what he believes is right as seen when he clashes with other characters over their immoral actions, especially Revy.
He is one of the "luckiest" characters in the series as he managed to survive every single thing he experienced from being taken hostage to being shot at. Thus far, he has survived the wrath of Revy, Balalaika, Roberta, and Sawyer, all without using a weapon other than his wit. Though he is a pirate with morals, he is neither good nor evil as described by Yukio, but rather in the twilight, unable to chose between a life of crime or normality.
Later in the series, Rock begins to enjoy his life as a pirate and becomes even more comfortable with corruption, and it is shown that a darker side of his personality is beginning to emerge. In "Roberta's Blood Trail", he is personally appointed by Chang to help Garcia Lovelace and Fabiola Iglesias track down Roberta before she finds the American Special Forces unit that killed Garcia's father before she and the unit kill each other and endangering Roanapur to destruction at the hands of the United States. Rock knows that Chang doesn't care if Garcia or Roberta is killed and only wants to keep Roanapur out of the eyes of the world for it's drug trafficking, and Rock manages to turn Chang's plan around by demonstrating exceptional deductive reasoning skills by figuring out every factions motives and playing on them. He manages to give the Americans an escape route out of Roanapur and towards their mission area in Laos to stop Roanapur's drug trade, as well as having Roberta follow them and have Garcia snap Roberta out of her psychotic rampage. However, doing all that required him to use the same callous and manipulative thinking as Chang, and he even seems to find the same sense of power over others psychologically rewarding. However, this apparent change in Rock alienates and disturbs the other characters, particularly Revy and Dutch, who do not understand Rock's motives and think he simply doing it to extract a large reward from Garcia, causing them to fear that Rock is becoming sadistic, cunning, and ruthless due to being corrupted by Roanapur. However, he does it entirely because he wanted to save someone, and manages to achieve Chang's goal of keeping the US out as well as saving Fabiola, Garcia and Roberta. Fabiola, enraged by Rock's high risk strategy which involved manipulating Garcia into a game of "Cambodian Roulette" with Roberta and gambling with people's lives, shoots him with a blank and states that she hopes never to see him again. Months later, things haven't changed in Roanapur and Rock begins to think he hasn't made a difference at all. Revy later tells him that it will hurt him if he continues to look at Roanapur with life in his eyes, to which Rock responds that he came close to the darkness but is not ready for it yet.
Dutch has stated earlier that he believes Rock should never wield a gun because if his bullets were like his words, they would ricochet back to them.