Yuujirou Hanma hails from Japan, standing 190 cm tall and weighing roughly 120 kg. He possesses red hair and an immensely muscular physique. A distinct demonic pattern manifests across his back muscles during combat or intense focus, a hereditary trait of the Hanma bloodline. His background shows significant evolution from adolescence. At 16 during the Vietnam War, he displayed less savagery, primarily disabling foes and destroying equipment without excessive killing. Yet, two years of warfare amplified his bloodlust, transforming him into a merciless combatant eliminating opponents indiscriminately. This cemented his reputation as unstoppable, culminating in his solo defeat of the United States military—a feat previously accomplished only by his father, Yuuichirou Hanma, during World War II. Yuujirou works as a freelance mercenary and assassin for governments and organizations, commanding exceptionally high fees that sustain his expensive lifestyle. He holds a contractual agreement with the United States government granting him legal immunity, requiring annual presidential renewal—a concession stemming from his demonstrated invincibility and threat to national security. Personality-wise, Yuujirou embodies arrogance, violence, and emotional manipulation. He perceives mercy as weakness, living solely for combat and destruction. His philosophy centers on attaining all objectives through physical dominance, rejecting weapons in favor of his body as the ultimate instrument of power. He views himself as the planet's only true "male," considering all others—regardless of biological sex—inferior "females" or "wimps" beneath his dominance. Attributable to unprecedented testosterone levels, this mindset drives acts of sexual violence against men and women, including the rape of Joe Williams which shattered the victim psychologically. Despite his brutality, Yuujirou exhibits sporadic restraint or superficial kindness. After fighting his son Baki to a standstill, he offered soup as a gesture of respect. He expressed embarrassment over signing a child’s autograph and avoided disclosing the incident to Kaoru Hanayama. He also claimed to protect individuals connected to Emi Akezawa, his former lover and Baki’s mother, whom he murdered by rupturing her eardrums and breaking her spine. Musashi Miyamoto observed latent "kindness," noting Yuujirou occasionally fought as a "role model" for oppressed populations by eliminating their tormentors. Within family dynamics, Yuujirou is the father of Baki and Jack Hanma, acknowledging fathering numerous unidentified children worldwide. His relationship with Baki combines antagonism and manipulative encouragement; he engineers destructive challenges to spur Baki’s growth, aiming to mold him into a worthy opponent for personal entertainment. He pressured Baki to engage sexually with his girlfriend Kozue Matsumoto to trigger physiological maturation and enhance fighting prowess. During their climactic battle, their interactions revealed complex, non-verbal emotional ties, including an improvised shared meal pantomime. Yuujirou’s capabilities justify his epithets "the Strongest Creature on Earth" and "the Ogre." He instantly adapts any martial arts technique after witnessing it once. His seismic strength allows him to punch the ground, simulating earthquakes. He evades bullets and endures hostile environments like active volcanoes. His "demon back" transformation augments physical attributes to supernatural levels. One technique, "Guise," involves using an opponent’s body as a spinning shield to deflect projectiles—a method inherited from his father Yuuichirou. His sole confirmed vulnerability emerged during a spiritual manifestation of Yuuichirou, who appeared to support Baki. Yuujirou displayed uncharacteristic shock and fear upon seeing his father, whose presence also terrified the primordial fighter Pickle. This incident implies Yuuichirou’s superiority, though no direct combat is documented, likely due to Yuuichirou’s death during Yuujirou’s youth. Yuujirou functions pragmatically in modern society, leveraging connections among global elites. He displays erudition and cultural sophistication, frequenting high-society venues appropriately dressed and engaging in nuanced conversations, such as accepting dinner invitations from Baki and socializing with Doppo Orochi, whom he respects for surviving their past confrontation.