Gon Freecs is a young boy who serves as the protagonist of the narrative. He was raised on Whale Island by his aunt, Mito, after being left in her care by his father, Ging Freecs, who departed on his own adventures when Gon was very young. Gon is an athletic, friendly, and initially naive child who possesses an unwavering optimism and a simple, straightforward way of thinking. Having spent much of his childhood exploring the forests of Whale Island, he has developed extraordinary senses, including an acute sense of smell and the ability to befriend animals.

Gon's primary motivation is to become a Hunter in order to find his father and understand why Ging would prioritize the life of a Hunter over raising his own son. A chance encounter with Kite, a disciple of Ging, inspires Gon to leave home and take the grueling Hunter Examination. Throughout the story, Gon demonstrates a remarkable talent for adaptation and learning, allowing him to survive dangerous encounters and grow rapidly in strength. His natural charisma and earnestness allow him to form powerful and lasting friendships, most notably with Killua Zoldyck, Kurapika, and Leorio Paradinight. The friendship with Killua is particularly central, as their contrasting personalities complement each other. Gon's role in the story is that of the driving force, whose quest to find his father pulls the other main characters into a series of escalating adventures, from the Hunter Exam to the criminal underworld of Yorknew City, the video game reality of Greed Island, and the devastating conflict with the Chimera Ants.

While Gon is generally a kind and good-natured person, his morality is highly instinctual and not governed by conventional rules. He can be recklessly impulsive and shows a surprising capacity for ruthlessness when his friends are threatened or when he is confronted with an enemy he deems unforgivable. This darker aspect of his personality becomes the central focus of his development during the Chimera Ant arc. After the death of his mentor, Kite, at the hands of the Chimera Ant royal guard Neferpitou, Gon's grief and rage consume him. He threatens to kill an innocent girl, Komugi, to force Pitou to comply, and later enters into a life-binding Nen contract. This contract grants him all the power he will ever possess in his lifetime, transforming his body into a physically mature, immensely powerful state that allows him to brutally kill Pitou, but at the cost of nearly destroying his own life and his ability to use Nen.

Gon's development is a journey from innocence to a traumatic understanding of loss and consequence. He is ultimately saved by the intervention of his friend Killua and Killua's sibling, Alluka. Following his recovery, Gon finally reunites with his father, Ging, at the top of the World Tree. The meeting, long the goal of his journey, does not result in a traditional father-son relationship; instead, Gon accepts that his father's true passion is adventure and realizes his own journey was the important part. Having fulfilled his goal and lost his Nen abilities, Gon returns to Whale Island to live with Mito, having come full circle from the start of his adventure.

Notable abilities include his incredible physical senses and strength, honed by nature and training. As a Nen user, Gon is classified as an Enhancer, a type that specializes in increasing one's natural offensive and defensive capabilities. His signature technique is Jajanken, a three-part ability modeled after the game rock-paper-scissors. Rock is a powerful, concentrated punch for close-range. Scissors uses transmuted aura to form a blade capable of cutting. Paper is a long-range emission-type blast of aura. His most powerful, and self-destructive, ability is manifested through a Nen Contract during his fight with Neferpitou, which forces his body to age to a peak physical state in exchange for all his latent potential and life force.