Goki Shibukawa, also known as Gouki Shibukawa, is a 75-year-old Japanese martial arts master specializing in jujutsu, with extensive training in aikido and judo. He began training prior to World War II, serving as a military assassin driven by a love for combat and bloodshed during the conflict. Physically, he stands 155 cm (5'1") tall, weighs 47 kg (103 lbs), and has grey hair. He wears large-framed tortoiseshell glasses and possesses an artificial right eye, the result of a past fight injury. His typical attire is a white keikogi shirt tucked into black hakama pants, though he occasionally wears a yukata and haori coat. Outwardly calm but harboring a violent streak, Shibukawa displays arrogance, ruthlessness, and a hunger for battle. He employs psychological tactics, feigning weakness by asking to use the bathroom before fights or pretending frailty to unsettle opponents. Despite his traditional background, he believes anything is permissible in real combat, including unconventional moves like headbutts. Highly cautious due to teachings from his master, Kihei Mikoshiba, he sometimes experiences subconscious-induced illusions, such as imagining impassable barriers, to avoid confronting overwhelming threats like Yujiro Hanma. His strategic and analytical mindset aligns with an INTJ personality type, emphasizing independence and intuition. His martial arts expertise centers on *Shibukawa-ryuu jujutsu*, notably utilizing the *Aiki* principle to redirect an opponent's force against them, amplifying it with his own power to overpower physically superior foes like Biscuit Oliva, dislocating joints or applying throws. Additional skills include pressure point strikes to induce paralysis or unconsciousness, extrasensory perception to detect danger, illusion creation as a defensive mechanism, and spraying water into an opponent's tear duct to cause suffocation via uncontrolled tearing. Shibukawa's background includes a pivotal confrontation with his master, Mikoshiba, whom he attacked in a fit of bloodlust at age 39. Mikoshiba retaliated by slashing Shibukawa's back with a sword; Shibukawa then declared mastery of his own style and renamed their dojo. In the *Maximum Tournament Saga*, he defeated opponents such as Olympic wrestler Roger Harlon by targeting neck pressure points and karateka Koushou Shinogi by exploiting his artificial eye to create an opening. His semi-final bout against Jack Hanma ended in loss after Hanma bit his eye socket, though Shibukawa had previously envisioned a symbolic barrier warning him of the danger. Later developments include a temporary alliance with Baki Hanma to fight the convict Ryuukou Yanagi, a sparring match with Biscuit Oliva where he used *Aiki* to subdue him, and a confrontation with Musashi Miyamoto in the *Baki Dou* arc where he employed *Aiki* to momentarily control him, though the outcome was not decisive. His relationships evolve through combat; initially dismissive of Doppo Orochi, he later expressed mutual respect and a desire to fight him again, occasionally sharing drinks at the Shinshinkai Dojo. Throughout his appearances, Shibukawa transitions from a ruthless youth to a wiser but still formidable elder, maintaining his role as a tactical combatant who challenges both peers and newer generations.