Benimaru, born a nameless ogre prince within his tribe’s ruling lineage, was destined for leadership. His youth revolved around intensive combat training under the Sword Oni until the Orc Lord’s armies annihilated his village, forcing him to flee with his sister Shuna and survivors. Their escape led to a clash with Rimuru Tempest, initially misjudged as a foe. Upon realizing their error, Benimaru offered remorse and pledged allegiance to Rimuru, accepting sanctuary in exchange. Receiving the name "Benimaru" from Rimuru catalyzed his evolution into a kijin, cementing his role as the Jura-Tempest Federation’s foremost military strategist. As an ogre, Benimaru possessed a towering, muscular frame with crimson hair, scarlet-tinged skin, and striking horns. His kijin transformation stabilized his height at 180 centimeters, softened his features into near-human elegance, and normalized his complexion. He traded traditional armor for a blood-red kimono that rippled with his fiery aura. The red tear-shaped markings beneath his eyes—a permanent scar from a childhood incident involving Shuna—persisted through all forms. Once brash and combat-obsessed, Benimaru cultivated a measured, tactical mindset as military commander. His devotion to Rimuru remains unwavering, though he prioritizes frontline action over bureaucratic tasks. Despite battlefield confidence, he stumbles in romantic pursuits, later formalizing unions with the tengu Momiji and beastketeer Albis to secure his lineage before further evolution—a testament to embracing duties beyond war. His combat expertise lies in fire and light magic, amplified by evolution and Rimuru’s gifts. The Unique Skill "Grand Marshal" grants prescient battlefield foresight and tactical dominance, while the Ultimate Skill "Amaterasu" bestows command over heat, light, and spacetime. Signature techniques like "Hell Flare" merge blade mastery with cataclysmic flames. Post-evolution, he gained immunity to physical, elemental, and mental assaults, coupled with inexhaustible stamina through "Nihility Supply." Bound by unshakable loyalty to Rimuru, Benimaru nurtures a protective bond with Shuna and shares mutual respect with comrades like Souei and Hakurou. His rivalry with Diablo fuels a relentless drive to prove himself Rimuru’s most formidable ally. Transitioning from a vengeance-fueled refugee to a poised commander and father, Benimaru’s ascension to Flame Demon God solidified his role as a linchpin of Rimuru’s forces, equipped to thwart existential threats to their world.