Leorio is a licensed Hunter, aspiring doctor, and one of the first companions Gon meets during the Hunter Exam. Dressed in a dark suit and round glasses, he presents himself as the group’s worldly adult authority. This impression generally survives until he starts shouting.

Loud, argumentative, and openly motivated by money, Leorio initially seems far more interested in wealth than heroism. His real ambition tells a different story. After losing someone to an illness that could have been treated if money were available, Leorio resolves to become a doctor who can help patients unable to afford care. The Hunter License offers the financial opportunities and access he needs to pursue that goal.

That purpose explains Leorio’s most important contradiction. He talks like a materialist, but acts from compassion. His temper can be spectacular, yet it usually erupts when someone vulnerable is mistreated or one of his friends is in danger. Gon, Killua, and Kurapika may surpass him in combat ability, but Leorio repeatedly proves that courage is not limited to the strongest person in the room.

As his training develops, Leorio learns to project a fist-shaped Nen attack across a distance. It is a wonderfully appropriate ability for someone whose instinctive response to injustice is often to reach across whatever stands between him and the person responsible.

Leorio may look like the responsible adult barely holding the expedition together.

Emotionally, he is also part of the expedition.