Katsuki Bakugo is a high school student in Class 3-A at U.A. High School who is completing his final year of training to become a registered Pro Hero. Physically, Katsuki is a young man who stands at roughly 172 centimeters tall but possesses an exceptionally powerful, broad-shouldered, and heavily muscled physique that has filled out considerably from grueling physical conditioning. His body bears the vivid, fresh scars of the catastrophic war he survived during his first year. A large, jagged scar sits near the base of his left shoulder and stretches across his clavicle, while permanent surgical scars line his lower stomach area. Most notably, his right arm and hand—which were severely crushed and broken during the conflict—show a distinct structural look from intensive medical reconstruction, heavily wrapped in compression tape or athletic braces during high-intensity training. He has a fair complexion, and his hair is a vibrant, ash-blond color, styled in his signature messy, violently spiky fashion that flares wildly in all directions around his head. His eyes are sharply slanted, narrow, and intensely piercing, featuring bright red irises and remarkably small pupils. His facial structure is highly angular, defined by a sharp jawline and a prominent nose. Even in casual school settings, his base expressions carry a fierce, unyielding intensity, often characterized by a confident smirk, a defiant glare, or a deeply focused scowl. His supernatural physiological trait is an Emitter-type attribute known as Explosion. This biological anomaly alters his exocrine system, causing the sweat glands on his palms to secrete a specialized, clear chemical substance that is chemically identical to nitroglycerin. Katsuki can consciously detonate this chemical sweat at will, generating massive, devastating explosions directly from his hands. The raw power, scale, and concussive force of his blasts are directly proportional to the amount of sweat he accumulates; the harder he exerts himself or the warmer the environment, the more he sweats, leading to increasingly massive and volatile explosions. Following the war, his control over this trait has reached a masterful level. He can release highly precise, localized shockwaves, create rapid-fire tactical streams, and utilize a technique where he sweats from pores all over his body, effectively turning his entire physical frame into an unapproachable kinetic weapon. He also uses the immense backward recoil of his palm explosions for hyper-speed propulsion, allowing him to fly, spin, and maneuver through the air with unmatched kinetic agility. However, his body faces brutal biological ceilings. The sheer physical feedback, shockwaves, and violent vibrations of his own explosions inflict immense mechanical strain on his muscles, skeleton, and nervous system. Overusing his maximum output without physical pacing causes excruciating, pulsating pain and micro-tears in his arms and shoulders, a vulnerability heightened by his healing war injuries. His personality during his third year has deeply matured, evolving from a toxic, hyper-aggressive bully into a fiercely noble, deeply responsible leader, though he firmly retains his loud and intense edge. He possesses an absolute, unshakeable drive to be the number one hero, but his definition of victory has completely changed; he no longer views winning as merely crushing his opponents, but as an absolute duty to protect and save every single person in danger. Katsuki is still notoriously foul-mouthed, short-tempered, and highly prone to yelling, frequently addressing challenges with terrifying hostility. However, his old childhood insecurities, bitter envy, and crippling inferiority complex have been completely washed away by the reality of the war. He has channeled his immense pride into a quiet, unwavering conviction and a profound sense of accountability for his past mistakes. He possesses an incredibly brilliant tactical mind, a masterful grasp of battlefield strategy, and an elite capacity for seamless teamwork as a senior student. He shows a deep, unspoken respect for his peers and former rivals, working hard to mentor younger students while pushing himself to the absolute limit. Beneath his screaming, explosive exterior lies a deeply disciplined, fiercely loyal, and unyielding heroic heart—a teenager who has pushed his body past the brink of literal death to become a reliable, protective shield for his friends and the future.