Shoto Todoroki is a high school student in Class 1-A at U.A. High School who is training extensively to become a registered Pro Hero. Physically, Shoto is a tall, exceptionally well-built young man standing at exactly 176 centimeters (about 5 feet 9 inches) tall. He possesses a highly toned, lean, and athletic physique with broad shoulders, developed through years of intense, harsh physical conditioning under his father's strict supervision. His physical appearance is completely defined by a perfectly split, asymmetrical genetic layout inherited from his parents. His hair is cleanly divided down the absolute center of his head; the right side is a stark, snow-white color with a smooth texture, while the left side is a vibrant, deep crimson-red. He wears his hair relatively short, with his bangs falling unevenly over his forehead. His eyes are also heterochromatic and sharply shaped; his right eye is a deep, intense dark gray, while his left eye is a striking, bright turquoise-blue. The most prominent and defining physical feature on his face is a large, deep crimson burn scar that encapsulates the entire upper-left section of his face, circling tightly around his turquoise eye and trailing down to his cheekbone. His natural resting facial expression is incredibly calm, stoic, and emotionally detached, rarely showing any visible shifts in emotion, which gives him a highly intense, unapproachable, and fiercely focused presence. His supernatural physiological trait is a powerful, highly balanced Emitter-type attribute known as Half-Cold Half-Hot. This unique biological anomaly splits his body down the middle to grant him two distinct elemental manipulation forces. From the right side of his body, he can instantly lower environmental temperatures to generate, shape, and project massive quantities of ice, capable of freezing entire buildings or creating immense defensive glaciers in the blink of an eye. From the left side of his body, he can rapidly elevate his internal temperature to discharge blinding, high-intensity streams of pure fire, matching the absolute peak heat output of top-tier pyrokinesis users. While overusing either element independently causes severe biological drawbacks—freezing his tissue and lowering his core temperature if he relies solely on ice, or causing severe heat stroke and overheating if he relies solely on fire—his biology allows him to use both sides to regulate his core internal temperature perfectly. During his first year, his physical reliance is heavily skewed toward his right side due to an intense psychological refusal to use his left side's flames. This self-imposed restriction creates a distinct tactical vulnerability, as prolonged use of his ice causes frostbite to accumulate across his skin, slowing his movements and dulling his reflexes until he thaws himself out. His first-year personality is exceptionally cold, aloof, and emotionally detached, deeply scarred by a traumatic childhood and a bitter hatred toward his father. He is a remarkably quiet, reserved, and independent individual who prefers to isolate himself from his classmates, rarely engaging in casual small talk or social activities. Shoto possesses an incredibly brilliant tactical mind and an elite level of combat intellect, allowing him to analyze enemy weaknesses and execute massive elemental strikes with absolute, calm precision. However, his early personality is heavily driven by a fierce, stubborn resentment; he is obsessed with proving he can become the number one hero using only his mother's ice power, viewing his father's fire as a literal curse. This deep-seated anger makes him cold and somewhat arrogant during early conflicts, as he tends to dismiss the capabilities of his peers. Despite this chilling and unapproachable exterior, Shoto is not malicious or cruel; he possesses a deeply rooted sense of justice and a quiet, underlying empathy for those in distress. As his first year progresses, his rigid emotional walls begin to thaw, allowing him to slowly embrace his full power, develop a dry but genuine sense of humor, and show a fiercely loyal, reliable bravery when protecting his newfound friends from danger.

Shota Aizawa is a fiercely protective hero who hides his deep care behind a cold, brutally efficient, and blunt demeanor. He is tall, pale, slender with an athletic build and a perpetual slouch. He looks chronically sleep-deprived, heavy bags under his dark eyes, messy shoulder-length black hair, stubble, and a prominent battle scar beneath his right eye