HunterXHunter
The story follows a young boy named Gon Freecss who was told all his life that both his parents were dead, but when he learns from Kite, an apprentice of his father, Ging Freecss that he is still alive and has since become an accomplished Hunter, Gon leaves his home on Whale Island and take the Hunter Examination in order to become a Hunter like him. During the exam, Gon meets and eventually befriends three of the other applicants: Kurapika, the last remaining member of the Kurta clan who wishes to become a Hunter in order to avenge his clan and recover their scarlet-glowing eyes, plucked from their corpses by a band of thieves known as the Phantom Troupe; Leorio, a prospective physician who, in order to pay for medical school, desires the financial benefits Hunters receive; and Killua Zoldyck, another twelve-year-old boy who has left his former life as a member of the world's most notorious assassin family. Among many other examinees, Gon continuously encounters Hisoka, a mysterious and deadly transmuter who takes an interest in him.
Gon
Gon is an athletic, rustic, and friendly boy who is searching for adventure. Also, he isn't very good at math. However, having spent a lot of time in the woods as a child, he is very good with animals. Gon is an Enhancer, who are known for being simple-minded and determined. This determination and talent leads to both potential allies and potential enemies trusting in him and taking his side. He has inhuman senses; Gon has a heightened sense of smell almost like a dog and has very good vision, as well as having very keen taste. Gon wants to become a Hunter because he wishes to find out the depths of an occupation that would cause a father to choose the profession over being with his own son.
Leorio
Leorio once lost a close friend (a boy named Pietro in the 1999 anime adaptation) to a debilitating illness. Leorio feels deeply remorseful about being unable to save his friend, as the illness was entirely curable but required a surgery he could not afford. Thus, he aspires to become a doctor — one whom not only cures the ill of their diseases, but also one who works pro-bono for people who cannot afford it. In this light, his outwardly superficial reason to join the Hunter Exams in the pursuit of great wealth gains a more noble justification — the money he earns is used not only to fund his medical school fees, but also to pay for the medicine and other miscellaneous expenditures when treating those who can not afford it.
Kurapika
Kurapika is an intelligent individual, possessing vast knowledge. He is reticent; not one to open up to people easily and quite judgmental. His distance from others initially keeps him level-headed and moralistic, but his heart has been poisoned with sadness and hatred. Having been traumatized from losing everyone he loved at the age of twelve, Kurapika closes his heart to new people and remains introverted as to stay focused on his goal. Though Kurapika outwardly states that he desires to become a Blacklist Hunter and his ultimate goal is to capture the band of thieves that massacred his family, his fury allows him to compromise his personal morality and delve into the squalid side of society. He is prone to fits of uncontrollable anger should the memory of his clan be insulted in any way.
Killua
Killua was born as the middle child to a family of known assassins, the Zoldycks. Showing great promise from birth, Killua followed the traditional Zoldyck training. He had already mastered many killing techniques at a tender age, and was set to be one of the best assassins the family has ever produced. At the age of three, he started his training on tailing other people.[5] He was forced to battle in the Heavens Arena martial arts tournament at the age of 6, in which he took two years to get to the 199th floor (even though he was accepted to the 200th floor, he bailed out). Bored and tired of killing, Killua unexpectedly rebelled against his family, injuring both his mother and second brother, and ran away from home to take the Hunter Exam for fun. He meets Gon during the first portion of the Hunter Exam and they become the best of friends. He thinks being with Gon is exciting and adventurous.