Henry Hart (also known as Kid Danger) from Henry Danger is a teenager with blond hair and brown-hazel eyes, typically dressed in casual shirts and jeans. As Kid Danger, he sports a red mask and a high-tech blue, silver, and red uniform with a black utility belt. Personality-wise, Henry is charming, ambitious, and fiercely loyal, though he can occasionally be awkward or naive. Despite his goofy and expressive nature, he possesses sharp instincts and a quick combat mind, maturing into a courageous, independent leader who thinks outside the box to save Swellview.

Charlotte Page is Henry's genius best friend and operational coordinator, recognizable by her bright brown eyes and long, voluminous curly hair. Personality-wise, Charlotte is exceptionally smart, sharp-witted, and no-nonsense, consistently acting as the ultimate voice of reason for both Henry and Ray. She is fiercely protective, observant, and quick-thinking, using her unmatched puzzle-solving skills and technical mind to run things behind the scenes and pull the team out of trouble.

Captain Man (Ray Manchester, or Captain Man) is Swellview's indestructible superhero mentor, a muscular adult recognizable by his styled brown hair and blue, red, and silver costume. Personality-wise, Ray is flamboyant, intensely narcissistic, and incredibly dramatic, frequently bragging about his invulnerability. Despite his childish tantrums, massive ego, and complete lack of patience, he is deeply protective of Henry and genuinely cares about keeping his city safe, serving as a fierce, heavy-hitting ally.

Jasper Dunlop is Henry's eccentric best friend in Henry Danger, recognizable by his bright blue eyes and big curly raspberry blonde hair (which he later straightens). He typically dresses in colorful, loudly patterned casual shirts—sometimes featuring dinosaur flames—and casual jeans. Personality-wise, Jasper is incredibly gullible, sweet-natured, and intensely quirky, famously known in early seasons for his bizarre, passionate obsession with collecting buckets. Though his cluelessness and terrible ideas frequently make him the comedic "butt of the joke" among his friends, he is deeply honest and fiercely loyal. After accidentally discovering Henry’s secret, his bravery shines as he becomes the trusted cashier at Junk N' Stuff and a core crime-fighting ally to the team.

Schwoz Schwartz is the eccentric genius scientist in Henry Danger, recognizable by his unkempt hair, distinctive Yiddish/German accent, and casual mechanic-style jumpsuits or work clothes. Personality-wise, Schwoz is brilliant, quirky, and deeply well-intentioned, serving as the technological mastermind who built the Man Cave and all of Captain Man's high-tech gear. However, he famously lacks common sense, often getting distracted by bizarre ideas, wild inventions, or worm-heavy diets, while hilariously dropping into dramatic self-preservation poses the moment danger strikes.

Piper Hart is Henry’s social media-obsessed younger sister from Henry Danger, recognizable by her blonde hair, blue eyes, and stylish casual clothes. Personality-wise, Piper is fearless, intensely aggressive, and notoriously short-tempered, famously yelling her iconic catchphrase, "I am not okay!" whenever a minor inconvenience or social media crisis occurs. As the fast-texting president of the "Man Fans" fan club, she can be incredibly loud, bratty, and prone to violent overreactions. However, after she discovers Henry's superhero secret in Season 5, she matures significantly into a chill, supportive, and fiercely protective ally who brings her chaotic energy to the Man Cave to help save Swellview.