Shuichi Akai is a British-American FBI agent of Japanese descent, born in England. His father, Tsutomu Akai, vanished seventeen years prior to the current timeline while probing the unsolved murders of Kohji Haneda and Amanda Hughes. After the disappearance, his mother, Mary Sera, moved the family to Japan. Driven to uncover the truth about his father, Shuichi relocated to the U.S. for education before joining the FBI. Five years before the present, he infiltrated the Black Organization under the alias Dai Moroboshi, assuming the codename Rye. His mission required him to date Akemi Miyano, a low-tier member, to gain proximity to her sister Shiho Miyano—a core scientist codenamed Sherry. Though initially manipulative, Shuichi formed genuine feelings for Akemi, prompting him to sever ties with FBI partner Jodie Starling. His cover was later blown due to an operational error by FBI agent Andre Camel, leading to Akemi’s assassination by the Organization’s agent Gin. Her death cemented Shuichi’s relentless vendetta against the group. After Akemi’s killing, he returned to Japan and orchestrated a meticulously planned fake death during a clash with CIA operative Hidemi Hondou, using prosthetics and staged blood to trick the Organization. With help from Yukiko Kudo’s disguise expertise, he adopted the identity of Subaru Okiya, a graduate student. As Subaru, he shielded Shiho (now Ai Haibara) and joined forces with Conan Edogawa, exchanging intel and devising strategies to dismantle the Organization. Shuichi’s persona blends stoic reserve, strategic opacity, and mission-first pragmatism, often sidelining personal bonds. Socially detached, he struggles to perceive emotional cues, yet displays loyalty through subtle yet meaningful gestures, such as sending martial arts videos to his sister Masumi Sera to bridge their strained relationship. His tactical genius and lethally precise marksmanship earned him the moniker “Silver Bullet” within the Organization, symbolizing their fear of his disruptive potential. Key turning points include a pivotal childhood encounter at ten years old, during a beachside case involving Shinichi Kudo and Ran Mouri, which first revealed his detached nature, alienating Masumi. Years later, he mended ties by recruiting her into an investigation. His rivalry with Rei Furuya (Bourbon) stems from the death of their mutual acquaintance Scotch, whom Bourbon erroneously believes Shuichi killed—a friction complicating their shared goal of destroying the Organization. In *The Scarlet Alibi*, a film compiling Akai family arcs, his story is retold through edited archival scenes. A post-credits sequence shows him delivering a cryptic, foreshadowing message linked to *The Scarlet Bullet*, reaffirming his central role in the overarching plot. The film subtly adjusted details, such as depicting him firing a shotgun one-handed to preserve continuity with his disguised identity. His skills encompass advanced deductive reasoning, Jeet Kune Do mastery, and firearms expertise. He independently solves cases and collaborates with Conan, leveraging Morse code and cryptography to decode critical intelligence. Strategic ambushes—like sniping Organization operatives during a transmitter crisis—highlight his methodical counterintelligence tactics. Intertwined family ties fuel his motives: younger siblings Masumi and Shukichi Haneda aid his investigations, while his mother Mary, physically reduced to a childlike form due to the Organization’s APTX 4869 drug, operates covertly. These bonds intensify his resolve to eradicate the group, merging personal vengeance with professional duty. Shuichi’s arc traces his evolution from a solitary operative to a guarded protector, haunted by guilt over Akemi’s death and driven by atonement. His choices consistently seek to balance tactical precision with shielding endangered allies, embodying a fraught duality of duty and penitence.