Leorio (レオリオ, Reorio) is one of the four main characters from the series Hunter × Hunter by Yoshihiro Togashi.
History
Leorio is first seen on the ship leaving Whale Island, heading for site of the Hunter Exam. Leorio meets Gon just as Gon leaves Whale Island to take the Hunter Exam. This is where he, Gon and Kurapika meet for the first time. They are the only three who refuse to abandon the ship after the furious storm.
Much is unknown about Leorio. He once lost a close friend, Pietro, 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 that not only cures the ill of their disease, but also waives the fee for the poor. In this light, his outwardly superficial reason to join the Hunter Exams in the pursuit of great wealth has a more noble justification—the money he gains is used not only to fund for his medical school fees, but also to pay for the medicine and other miscellaneous expenditures when treating those who can't afford it.
Personality
Leorio is not one who balks and retreats when faced against overwhelming odds in battle. A loyal, trustworthy ally who greatly values the ties of friendship, he acts like the 'big brother' of the group. He often provides comic relief; Killua normally ridicules him for his comparatively older age. His impulsive and brash nature has sometimes caused more trouble to people around him. Another flair he has is his ability to 'straight-talk' past any situation at hand.
Despite his assurances that he is only after money, he eventually reveals to Kurapika that his dream is to one day become a doctor in order to help the poor. He believes that becoming a hunter will provide him with the necessary funds for his education.
Though he is often outshone by the genius combat abilities of Gon and Killua, it should be noted that compared to the average man, Leorio is indeed very powerful. He is physically stronger than Gon (when neither are using nen), as he was able to open the second gate to the Zoldyck estate, while Gon was only able to open the first. His weapon of choice is a switch blade.
Combat
He fights with a switchblade and is usually seen carrying a briefcase.
As of the Yorknew City arc, Leorio has been shown to only master Ten, and has been learning more of the basic techniques from Gon and Killua. He has not yet developed his own Hatsu.