Badou Nails is a information mercenary with a bad nicotine addiction.
An informant in the underground looking for his next big scoop, Badou is often getting himself into trouble as he tries to gain information for whoever will pay him to do it. The only thing that's more on his mind than money is cigarettes, and God help you if he can't find a single smoke in time as he will go berserk with a pair of SMGs on whoever gets in his way until he can get another nicotine fix.
Haine seems to be on relatively good terms with him, and uses Badou's nicotine addiction to his own ends when he wants help to clear out a whole room full of enemies.
Badou lost his brother at the same time he lost his eye, and a ufly hand scar. His brother was also an information mercenary, and he used to follow his brother everywhere when he was young, hating the brother's nicotine addiction.
Later in the manga he tells that his brother was investigating the Underground for some unknow client. His brother was murdered, and he lost his eye, also got a ugly scar on the hand while tryng to protect the eye from the attack. Currently on the manga, he also got a job for investigating th Underground, and he doesn't refuse it. He finds out the one who kills his brother and also took his eye away, and was almost getting himself killed, but was saved by Mihai. Right now he is searching for answers about the Underground and what was his brother really investigating.