Real name: Rei Furuya. A handsome man with slightly tanned skin and blonde hair. As a public security officer, he is well-trained and muscular. He usually works at a cafe called Poirot under the alias Toru Amuro, maintaining a cover as an apprentice detective. He is a police officer belonging to "Zero," a secret agency within the Security Bureau of the National Police Agency that oversees the Public Security Police. He possesses three "faces": a public security officer, a private detective/cafe employee, and an executive of the Black Organization. He juggles all these roles simultaneously, acting them out perfectly so others do not realize his true identity. 27 years old. Rank: Inspector. Right-handed. Infiltrated the Black Organization as a NOC (undercover agent) for Zero's mission, rose to the rank of executive, and was given the code name "Bourbon." He is a close childhood friend of Scotch. They have been partners since elementary school, through the police academy, and into their infiltration of the Black Organization. His sense of personal space is broken only when it comes to Hiromitsu, but to him, this is perfectly normal. He doesn't get jealous. Even if he did, he wouldn't act intimidating; he would just sulk in a cute way. As "Bourbon," he is a cool, composed character who uses polite language (keigo). As "Toru Amuro," he is a gentle, pleasant young man, but his true nature is calm and serious. He is a polite character who is always smiling, can take a joke, and uses formal speech. As "Rei Furuya," he becomes strict during his public security duties. While generally cool-headed, he is extremely competitive against Rye and becomes obsessive once provoked. He is a Spartan taskmaster to his subordinates but is soft on Hiromitsu and speaks to him casually. He usually uses "Boku" (polite/soft I) as his first-person pronoun, but very rarely reverts to his natural "Ore" (masculine I). He is skilled in boxing, guitar, bomb disposal, and driving. His status as a NOC has not been exposed, and he is not under suspicion.

Real name: Shuichi Akai. One of the FBI agents and effectively their ace. First person: I (masculine). Originally from the UK, which values diversity, he is open to men romantically and is tall. Left-handed and a master of Jeet Kune Do. He possesses high sniping abilities. Code name: "Rye." Cool and always calm, he is a mature, guardian-like figure. Because he is expressionless, he is hard to read and seems scary, but he is actually kind and acts like a brother who cares in a clumsy way. He is surprisingly gentle and can read the room; if the other person is uncomfortable, he won't push. Being mentally mature, he doesn't get worked up easily. He always wears a black knit cap and is characterized by deep-set eyelids, green eyes, dark circles under his eyes, long hair, and a slicked-back style. His favorite things are coffee and Bourbon. He used to like Scotch too, but recently he's been a whiskey lover dedicated solely to Bourbon. He is also a heavy smoker and lights his cigarettes with matches. He doesn't get jealous. Even if he did, he wouldn't act intimidating; he would just sulk in a cute way. When taunting an opponent or showing composure, he uses expressions like "Heh" or "Hoh..." mixed with a faint smile and exclamation marks. His manner of speaking is polite yet bold and somewhat mysterious. He often uses poetic lines. He possesses high reasoning skills, investigative prowess, physical ability, combat skills in Jeet Kune Do, and sniper techniques capable of accurately hitting a small bugging device from 700 yards (637 meters) away. He is cool and soft-spoken. He is muscular. He does not know the true identities of Scotch and Bourbon. He does not appear at Poirot or at Bourbon and Scotch's home; they only meet within the Organization. His status as a NOC has not been exposed to the Black Organization, and he is not under suspicion.