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 who not only cures the ill of their diseases, but also one who works pro-bono for people who cannot afford it. His birthday is March 3rd, 1980