Let's talk about Wing, honestly. He often gets overlooked because he's not a Nen monster like Hisoka or a main protagonist, but I think he's quietly one of the most important pieces in the early game. What makes him unique is that he's our first real window into the structured, disciplined world of Nen—not through Gon's raw talent, but through proper teaching. He's the calm, competent mentor who doesn't have a tragic past or a hidden agenda (that we know of). In a story filled with chaotic power escalations and morally grey geniuses, Wing is almost... normal. He's a professional doing his job, and his power level feels grounded. That normality is his superpower. He teaches Gon and Killua the fundamentals with patience and sternness, but he also immediately recognizes their insane potential and the inherent danger in it. His decision to hide the truth about Nen's advanced techniques from them wasn't out of malice, but out of a very human sense of responsibility and fear. He saw two kids who could upend the world if left unchecked, and he tried to put a responsible speed limit on them, which of course immediately failed.
That failure is key to his character. He represents a traditional, orderly system of power progression that the main characters completely shatter. He's like a master chess teacher watching two prodigies invent a new board game mid-match. His subsequent role sort of fades, but I like to think Togashi kept him around as a measuring stick—a reminder of what a 'regular' strong Hunter looks like in this universe gone mad. His design is so unassuming too, just a guy in a suit. In a series where everyone's outfit screams their personality, Wing's professional attire reinforces his role: he's not a solo adventurer; he's part of the system, a guild-approved instructor. His uniqueness is in his ordinariness, which becomes extraordinary in the context of the madness around him.