Hunter x Hunter (2001)

Gon Freecss is a young boy living on Whale Island. He learns from "Hunter" Kite, that his father, who he was told was dead, is still alive somewhere as a top "Hunter," risking his life to seek unknown items, such as hidden treasures, curiosa, exotic living creatures, etc. Gon decides to become a professional Hunter and leaves the island. To become a Hunter, he must pass the Hunter Examination, where he meets and befriends three other applicants: Kurapika, Leorio and Killua. Can Gon pass this formidable hurdle, the Hunter Examination, to become "the Best Hunter in the World" and eventually meet his father?