Gon Freecss is the main protagonist of the popular Shonen manga and anime series, Hunter X Hunter.
Gon is a young boy (11 years of age in the beginning of the series, 14-15 years of age currently) who had longed dreamed of becoming a Hunter like his father, Ging Freecss. In fact, the main reason Gon became a Hunter was so he could find Ging, and to see why he valued being a Hunter more than taking care of his own son.
Gon is usually very friendly and cheerful. Despite growing up on an island with few kids his age, Gon seems to have an easy time making new friends. Despite this, however, Gon can also have extreme mood swings. When Kite was killed by Neferpitou, Gon's attitude went completely cold. This was made even worse when he learned that nothing could be done to restore him.
Gon also has a strong connection with nature and animals, a trait said to be common in great Hunters.
Despite being naturally clever, Gon is incredibly simple minded, a trait common with Enhancers. He hates math, and is easily confused by even the simplest problems.
Gon is also very open and honest. He tells Killua on multiple times how much he values their friendship, much to Killua's embarrassment. (Though Killua secretly has the same feelings about Gon)
Powers and abilities
Gon shows exceptional talent in his mastery of Nen. He, along with Killua, was able to master the basics in mere months.
Gon is an Enhancer, which can be specifically used to greatly increase his abilities through objects or even his own body. His signature attacks are part of set called Jajanken (meaning Rock Paper Scissors in Japansese). His strongest and most used attack, Rock, involves him using his ability as an enhancer to power up his fist with his nen.
Using his Transmutation ability, Gon can use his nen to create a blade of nen (Scissor), capable of cutting through tough surfaces. He can also send a blast of aura out of his hand as an Emission type attack. Because Gon is naturally an Enhancer, both of these techniques are much weaker than they'd normally be.
Gon is extremely agile, and is often able to out speed his opponents.
He seems to also have a high tolerance of pain, as evidenced in the Greed Island arc when he had his arm completely blown off and was still willing to fight.
Naturally, as part of being an Enhancer, Gon is generally simple minded and hates complicated things such as math. Despite this, however, Gon shows a lot of natural cleverness. He is able to come up with obscure ways to deal with problems, and a lot of time relies on his strong natural instincts. (Even in life-or-death situations)
When Gon learned Pitou could not restore Kite, Gon's anger turned into an incredible amount of aura, and somehow advanced Gon's body to an older version of him that had an undergone years of incredibly intense training. In this stage, his power was apparently comparable to Meruem, the Chimera Ant King. Once this power subsided, however, Gon's body was critically injured. An average exorcist would apparently die immediately if they attempted to remove the limitation.
After Gon's transformation, he completely lost his ability to use Nen. According to his father, Ging, this was likely because he had reverted to normal and just forgot how. Ging also states that Gon was lucky to have survived at all.