Yujiro Hanma, known as "The Ogre" and "The Strongest Creature on Earth," is a central figure in his narrative. Born to Yuuichirou Hanma, his lineage boasts extraordinary physical prowess, with his father speculated to be an even more formidable force shaping Yujiro's early development and relentless drive for dominance. His background features significant military action during adolescence. At 16, he fought both American and Viet Cong forces single-handedly in the Vietnam War, demonstrating supernatural combat abilities that cemented his fearsome reputation. This feat led the United States government to formally recognize him as a strategic asset, resulting in an ongoing contractual agreement renewed annually by each successive U.S. president. He later formed an unlikely companionship with U.S. Army General Gerry Strydum, whom he met on the battlefield. Physically, Yujiro stands 190 cm (6'3") tall and weighs approximately 120 kg (265 lbs), possessing a powerfully built frame with distinctively long legs and an exceptionally thick neck. His most iconic physiological trait manifests when his back muscles flex under peak tension, forming the visage of a demonic face, reinforcing his "Ogre" epithet. His appearance has been likened to a lion or ogre, reflecting his raw, animalistic nature. Yujiro's personality is defined by supreme arrogance, ruthlessness, and an obsession with strength. He views mercy as weakness and exhibits extreme violence, including murder and sexual assault, without remorse. He perceives himself as the only true "male" specimen globally due to unprecedented testosterone levels, considering all others inherently inferior regardless of biological sex. Despite this, he displays rare moments of respect or subdued sentimentality, such as sharing soup with his son Baki after a stalemate fight, expressing protective feelings toward individuals connected to his deceased former lover Emi Akezawa, or socializing cordially with acknowledged fighters like Doppo Orochi. He is highly intelligent, sophisticated in elite social settings, and possesses extensive knowledge across esoteric subjects. His familial relationships are complex and destructive. He fathered numerous children worldwide, though only Baki and Jack Hanma are prominently acknowledged. He killed Baki's mother, Emi Akezawa, during a confrontation with his young son, rupturing her eardrums and breaking her spine. He views Baki as both a legacy and a future challenge, deliberately orchestrating hardships to force his growth while showing minimal paternal affection. Jack Hanma, born from Diane Neil after a brutal assault, is largely disregarded. Yujiro's interactions with his sons are primarily defined by manipulation, violence, and a desire to mold them into worthy adversaries. Yujiro's combat capabilities transcend human limits. He employs exhaustive mastery of martial arts but often relies on pure physical supremacy. Documented feats include halting an earthquake with a punch, defeating entire military divisions, effortlessly overpowering elite fighters like Biscuit Oliva and Kaiou Kaku (who granted him the title "Kaiou Hanma," which he rejected), and demonstrating imperviousness to bullets, blades, and blunt trauma. His speed exceeds 270 km/h, complemented by instantaneous reflexes and analytical precision in dismantling opponents' techniques. Character development reveals shifts in his demeanor over time. As a teenager, he displayed less savagery, often disabling adversaries non-lethally. However, two years immersed in battlefield conflicts exponentially amplified his bloodlust, solidifying his ruthless persona. In later years, he exhibits marginally tempered behavior, occasionally engaging in social rituals like dining with Baki or offering tactical observations during battles involving fighters like Musashi Miyamoto and Izou Motobe.