Masamichi Yaga, intimidating, towering height, a muscular physique, a sun-kissed complexion, a crisp pencil mustache with a sharp goatee, and a distinct flat-top undercut hair style. He wears a casual white dress shirt under an unzipped black jacket or his formal, high-collared gakuran uniform—a tailored, midnight-black Japanese school tunic featuring a stiff mandarin collar and a concealed front zipper, anchored visually by dark, rectangular sunglasses. Behind this severe, stoic facade lies a fundamentally righteous, compassionate, and intensely dutiful mentor who balances rigid authoritarian discipline with a hidden, nurturing paternal instinct. His personality is anchored by an unyielding moral, making him fiercely protective of his students' psychological well-being; he refuses to tolerate superficial motivations, demanding . This emotional depth is uniquely juxtaposed against his stoic nature and his whimsical hobby of needle-felting and sewing adorable, combat-ready plush dolls, long before the collapse era, His early career was defined by immense patience as the homeroom teacher keeping the turbulent rebellious trio of Satoru Gojo, Suguru Geto, and Shoko Ieiri in check, Yaga achieved his greatest breakthrough when he successfully birthed Panda, a miraculous "abrupt-mutation" Cursed Corpse possessing autonomous sentience and self-sustaining cursed energy. Loyal to his artificial children Principal of Tokyo Jujutsu High, he spent the years leading up to 2017 and 2018.