Hakurou, a survivor of his Ogre tribe's destruction by the Orc Lord, is the grandson of master swordsman Byakuya Araki and formerly served as martial instructor for the Ogre royal guard. Though Ogres typically live around 100 years, Hakurou surpassed 300 years before evolving into a Kijin, further extending his lifespan. He trained Gazel Dwargo in swordsmanship roughly 300 years before the main events. After the Orc Lord's attack, Hakurou and fellow survivors initially mistook Rimuru for an enemy. Resolving this misunderstanding led Hakurou to accompany Rimuru to the Goblin Village. Rimuru bestowed the name Hakurou upon him during the conflict with the Orc Lord, triggering his evolution from Ogre to Kijin. This transformation shifted his appearance from an elderly figure with silver-tinted skin and prominent horns to a middle-aged man in his prime, featuring sharper features, reduced horns, and a silver goatee. His attire changed to include a white overcoat, occasionally depicted with a scarf in adaptations. [citation:] Hakurou possesses a calm, analytical, and disciplined personality. As Tempest's military Chief Instructor and an executive, he emphasizes teaching sword arts over reliance on innate Skills. Highly observant, he identifies combat techniques and monster abilities after a single use. While generally composed, he reacts strongly to being called "old man," often threatening increased training or consequences. He shows a softer side through doting, overprotective behavior toward his daughter, particularly regarding her relationship with Benimaru. Psychological analyses categorize him as ISTJ (Introverted-Sensing-Thinking-Judging) in the MBTI framework and Enneagram Type 1 ("The Perfectionist"), reflecting his focus on responsibility, order, and principles. Within the Jura-Tempest Federation, Hakurou oversees all military personnel training, including Rimuru himself. Renowned as the "Sword Savant," he champions practical combat arts, believing monsters over-depend on Skills. His role extends beyond instruction to strategic planning and crisis management, such as reassuring Rimuru during the Falmuth Kingdom's barrier incident in the anime. He wields significant influence among allies due to his wisdom and combat expertise. In combat, Hakurou employs a traditional swordmaster style prioritizing analytical observation and precision. He wields a plain-looking thin Japanese sword, proficient in detecting magical effects, deadly intent, and enemy weaknesses. His techniques focus on fundamental swordsmanship over flashy Skills, underscoring his philosophy that mastering basics yields true strength. Evolution into a Kijin and later an Oni heightened his physical capabilities while his core fighting principles remained consistent.