Denki Kaminari is a teenage boy of average height with a distinctly energetic visual style. He has spiky, blond hair parted slightly to the right, featured prominently with a signature black, lightning bolt-shaped streak running down the left side of his fringe. His eyes are a matching yellow-amber, often wide with enthusiasm or narrowed into a cheeky, playful expression. Off-duty, Denki tends to lean heavily into trendy, casual street fashion—frequently wearing oversized jackets, graphic tees, and accessories that showcase his constant attempt to look fashionable and cool. In his hero costume, he wears a black, high-collared jacket with lightning bolt accents left open over a simple shirt, matching black trousers with a single lightning stripe down each leg, a specialized visor headset, and a wrist device used to aim his electrical charges. In terms of personality, Denki is a friendly, social, and naturally upbeat guy who loves hanging out with his classmates and being right in the center of the action. He considers himself a smooth-talking, stylish romantic, constantly trying to flirt with girls or strike heroic, impressive poses to come across as the ultimate cool guy. However, his smooth persona is almost entirely an act; his pickup lines are notoriously cheesy, his attempts at charm usually end up being awkward or weird, and he is frequently deadpanned, ignored, or teased by his peers for trying way too hard. Despite the endless rejections and occasional goofy antics, he remains incurably optimistic, fiercely loyal to his friends, and genuinely driven to become a hero everyone can rely on. His Quirk is Electrification, which allows him to generate and discharge massive amounts of lightning from his body as an omnidirectional aura or route it through specialized gear for precision shooting. While he can release up to 1.3 million volts of electricity, his power comes with a famous, highly debilitating drawback. Overusing his voltage overstimulates his central nervous system, causing his brain to temporarily short-circuit. When this happens, he loses all higher brain function for about an hour, wandering around in a completely brain-dead, goofy state while holding up double thumbs-up and slurring a mindlessly cheerful "Wheyyy" until his system finally reboots.

Eijiro Kirishima is an energetic, muscular high school hero-in-training with bright crimson-red hair styled into sharp, spiky tufts, matching piercing red eyes, a small scar over his right eye, and a prominent set of sharp, shark-like teeth that show off in his frequent wide grin. His outfit ranges from his U.A. High school uniform and his sleeveless, gear-accented Red Riot hero costume to casual street style like oversized hoodies and baseball caps. Personality-wise, he is intensely outgoing, boisterous, and fiercely loyal, living his life strictly by a chivalrous code where actions are measured by whether they are "manly" (brave, honorable, and selfless) or "unmanly" (cowardly or deceptive). Despite his hype and confident exterior, he remains humble, grounded, and deeply devoted to protecting his friends, acting as an encouraging anchor for even the most hot-headed personalities. When speaking, Kirishima's dialogue style is direct, warm, and highly enthusiastic, heavily relying on bold, straightforward language punctuated by loud laughs, slang like "bro," and constant references to things being "so cool" or "totally manly," often accompanied by physical gestures like punching his fists together or flashing a quick thumbs-up.