It is a story about a twelve-year old boy named Gon who takes the Hunter Exam in quest to find his father. In the examination, he just doesn't meet friends who are willing to help but also applicants who kill without purpose. It's a good story of friendship, trust and loyalty.
(taken from Seek Out and wiki)

Picture	Name	Description
	Gon Freecs	Gon is a mountain kid with animatedly spiky hair. He usually wears boots with matching green shorts and jacket. He is a boy with out of the ordinary sense of sight, smell and hearing. He is an animal-friendly kid, wild animals stay tame under his command. He is often cheerful and in high spirits and can easily make friends. Gon is also an effective learner and does what he wants in his own and right way; understands true camaraderie and sacrifices himself in times of troubles for others. Gon's true purpose of joining the Hunter Exam is to find his father - one of the greatest Hunters in the world.
	Killua Zordick	Killua appears very sophisticated and unfriendly person. He is a strong-willed kid that stands on his own feet. He secretly has two personalities: a normal boy and a mature, cold-hearted eradicator. Killua is from a famous family of assassins. His grandfather, father, mother and siblings can be paid at a high price just to murder people. Being the strongest among the four children in the family, he was trained to be tough on killing being the successor of his father. Killua has no exact goal in his life. He ran away from home to take the Hunter Exam just for fun. There he meets Gon, Kurapika and Leorio. He learns the value of friendship and realizes that he doesn't want to kill for a living anymore. He then decides to help Gon find his father.
	Kurapika	Kurapika is very stubborn-looking, clever, and kind-hearted person that is pretty strong despite his stature. he is the sole survivor of the Kuruta Tribe that was wiped off the map five years ago by the Genei Ryodan. He promised to himself that he would someday avenge his tribe and so he took the Hunter Exam in order to gather information.
	Leorio	Leorio is a businessman material. He wears a coat and tie. In the Hunter Exam, Leorio acts as if he's a greedy and money-loving person. But behind the mask is a hardworking person that abhors narrow-mindedness. A horrible past that haunts Leorio is the death of his friend named Pietro. Pietro passed away because of a sickness that Leorio was unable to cure due to lack of money. After his friend's death, Leorio promised to himself that he would become a doctor someday to cure ill people who lack financial needs at a low price or even for free. In order to do this, he will need loads of cash and so he took the Hunter Exam because it is one of the ways to become rich in no time.
	Hisoka	Hisoka wears dresses and make-up of a clown. He kills without any valid reason, it appears that it is one of his leisure pursuits. Hisoka, aside from being weird, is also mysterious for some reasons. This protagonist-antagonist's goal is to find and fight strong people for he thinks that he's one of the best fighters in the world. This is the reason why he took the Hunter Exam and pretended to join the Genei Ryodan. Hisoka also believes that Gon and Killua will become great fighters in the future that's why he's waiting for them to grow up.