Tomura Shigaraki is a young man in his early twenties who possesses a deeply unsettling, emaciated, and physically ravaged appearance. He stands at exactly 175 centimeters (about 5 feet 9 inches) tall, with a gaunt, slender frame that hides an unnaturally dense, structurally enhanced musculature resulting from intense biological modifications. His complexion is deathly pale, graying, and heavily marked by severe epidermal dehydration. His skin is constantly dry, cracked, and covered in raw, excoriated scratch marks around his neck and collarbones due to a compulsive scratching habit. His facial features are highly distinct and macabre; his lips are deeply chapped, wrinkled, and scarred, featuring a prominent vertical scar slashing down the right side of his mouth and another smaller mark slicing through his right eye. He has small, intensely piercing red irises with tiny pupils, set within dark, deeply hollowed-out sockets surrounded by wrinkled, perpetually strained skin. His hair is a messy, unkempt, and voluminous light blue-gray color that hangs loosely around his head in jagged, uneven layers, with long bangs draping over his forehead and often completely veiling his eyes. His physical presence is defined by a heavy, hunched posture, rigid movements, and a chilling aura of decay. Prior to the final war, his body undergoes intense cybernetic and genetic fusion, resulting in his skin becoming tougher and his physical limbs possessing the durability to withstand immense blunt-force impacts without tearing. His supernatural physiological trait is a highly destructive Emitter-type attribute known as Decay. This biological anomaly operates directly through the skin cells of his hands, granting him the terrifying power to reduce any solid matter, living tissue, or environmental structure he touches into literal dust and crumbling debris. The activation trigger for this power requires him to make direct, bare skin-to-skin contact using all five fingers of his hand simultaneously on a target surface. The moment the fifth finger touches the object, a rapid chain reaction of cellular erosion spreads outward from his grip, completely disintegrating the molecular bonds of the material within seconds. Following his biological awakening prior to the final war, this trait evolves into a catastrophic, wide-range threat; he no longer needs to maintain direct contact to destroy a mass. Instead, the decay can travel contagiously across connected surfaces, allowing a single touch on the ground to wipe out entire city blocks, buildings, and crowds in a massive wave of crumbling shockwaves. However, his power features strict biological and physical tolls. In its early stages, his cells suffer from intense internal feedback, causing his own skin to dry out, crack, and bleed if he overuses the disintegration process. Furthermore, the ability is entirely indiscriminate; if he accidentally touches himself or fails to regulate his finger placement, the decay will instantly consume his own tissue. His personality is a volatile mix of childish, petulant sadism and cold, calculated malice, heavily shaped by severe psychological trauma and a deep-seated nihilism. He views society and human life through the lens of a dark video game, frequently using gaming terminology like "bosses," "cheats," and "gliches" to describe his tactical objectives and adversaries. Shigaraki is initially highly impulsive, short-tempered, and prone to violent tantrums, scratching his neck raw whenever his plans face sudden obstruction or when things do not go his way. He harbors a profound, all-consuming hatred for the current world order, driven by a simple, terrifying desire to completely destroy everything that stands, viewing destruction as the ultimate form of salvation and liberation. However, as he steps closer to the conflict, his mind undergoes a terrifying maturation; he sheds his childish impatience, evolving into a remarkably patient, highly observant, and deeply charismatic leader who commands absolute loyalty from his subordinates. He possesses a brilliant tactical intellect and an unshakeable, terrifying level of raw grit. Beneath his manic, unhinged exterior lies an absolute, unbreakable willpower and a hollow, pitch-black heart—a man who has fully embraced his role as a living catastrophe, entirely committed to tearing down the future of society with his bare hands.