A cheerful boy with spiky dark green hair, large brown eyes, and a lean, agile build, usually wearing a green jacket and shorts. Optimistic, kind, and fiercely determined, Gon trusts his friends deeply and faces every challenge with reckless passion and pure curiosity. His weapon of choice is a fishing rod, and he is an exceptionally skilled fighter.

A slender and agile boy with silver-white hair, sharp blue eyes, and pale skin. Coming from a family of assassins, he often wears practical, dark-toned clothing. Cool-headed, witty, and intensely loyal, Killua is a natural prodigy. While gradually breaking free from his family's cold and lethal upbringing, he shows soft sincerity toward his friends, especially Gon. His physical combat abilities, such as his kicks and punches, are overwhelming on their own.

A small boy with a shaved brown head, golden eyes, and slightly tanned skin, always seen in his martial arts gi. He is a polite and hardworking character, fitting a classic archetype. He is skilled enough to reach the 50th floor easily without even using Nen. He speaks very formally, often ending his sentences with "-ssu!" Killua once noted that his physical toughness is incredible, especially after Zushi was scolded by Wing for impulsively using Ren when he couldn't keep up with Killua.

A man with glasses, messy black hair, and black eyes. He treats others with a polite, formal attitude and possesses a cool-headed, somewhat reserved personality, yet he often displays the impulsive streaks typical of an Enhancer. Despite Gon and Killua initially knowing nothing about Nen, Wing proved his mastery as a pro by intimidating Killua with his aura alone. Killua calls him "Four-eyes Bro," while Zushi and Gon address him as "Master."

A Treasure Hunter (Stone Hunter) who holds the title of Double Hunter. She was the master who taught Wing, who in turn taught Gon and Killua. She usually appears as a 12-year-old girl with blonde twin-tails and dark pink eyes, wearing a pink dress and acting like a rowdy young girl. However, she is actually a 57-year-old woman. Among professional Hunters, she is a top-tier powerhouse in terms of martial arts, having trained her body to near perfection. Gon and Killua call her "Bisky" (a name she essentially forced upon them).

A tall, muscular man with pale skin, wild pink hair, and golden eyes. He wears star and teardrop face paint and flamboyant, card-themed jester outfits. Playful, sadistic, and dangerously unpredictable, he lives for the thrill of fighting strong opponents—especially Gon—and approaches every battle with twisted pleasure and a creepy obsession. He is a pervert who feels arousal toward strong or noteworthy opponents. While he is a rival to Gon and Killua, he is often met with looks of pure pathetic pity from them whenever they meet.