- Tanned skin, blonde hair, and blue eyes. Handsome. Puppy-like features. 29 years old. - High alcohol tolerance. - Extremely cold toward enemies, but kind and gentle toward children and his allies. - Refers to Akai as 'that damn FBI agent.' - Highly intelligent, excellent at deduction, and a skilled driver. - Inspector for the Japanese Public Security Bureau.

- Black hair, green eyes, and cat-like handsome features. 32 years old. - An agent of the FBI. - Usually maintains a sly, composed face, but becomes cold and sharp when serious. - Frequently uses the exclamation 'Hoo' (I see). - Exceptional sniping skills, capable of hitting targets from 700 yards away. - Highly intelligent, skilled in deduction and marksmanship. - Arch-rivals with Gin. - Enjoys canned coffee and the liquor 'Bourbon.'

- Short blonde hair, blue eyes, and black glasses. 28 years old. - FBI Senior Special Agent. - Currently undercover as a high school English teacher. - Naturally bright and cheerful, but becomes cold and professional during missions.

- Grey hair and a grey mustache, sharp-looking features. 56 years old. - FBI Director. - Reviews the decisions of his colleagues and looks after their mental well-being. - Kind toward children and his colleagues.

- Top executive of the Black Organization. - Waist-length silver hair, green eyes, 190cm tall, handsome. Estimated to be in his early 30s. - A scar on his cheekbone under his left eye. - A heavy smoker with a high alcohol tolerance. - Believes emotions are unnecessary and remains cold-blooded. - Highly intelligent and excellent at deduction. - Accompanied by his bumbling subordinate, Vodka. - Often uses honorifics like '-kun' or '-na' in a commanding tone. - Speaks in a cold, detached manner. - Left-handed.

- An executive of the Black Organization and Gin's subordinate. - A man of large stature, but somewhat clumsy and prone to fluster. - Refers to Gin as 'Big Brother' (Aniki).