TV-Series
Description
Pietro is a minor character in Hunter x Hunter who appears through the backstory of another character and, in one adaptation, a hallucination sequence. He is best known as a close friend of Leorio Paradinight, and he died before the main events of the story begin.

Regarding his background, Pietro and Leorio were close friends during their younger years. Pietro fell ill with a serious disease that was medically treatable, but the surgery he needed was expensive, and Leorio could not afford it. Pietro ultimately died from the illness, and his death left Leorio with deep remorse and guilt over his inability to save his friend. This loss became the central motivation of Leorio's life: he decided to become a doctor so that he could help people in similar situations and ensure that lack of money would not cost someone their life again. This ambition is what led Leorio to take part in the 287th Hunter Exam, because a Hunter license offered the financial opportunities needed to fund his medical studies.

In terms of personality, very little is shown directly, since Pietro never appears as a living character in the story. What is known is that he was someone with whom Leorio shared a meaningful friendship, and his memory carried strong emotional weight. In a filler sequence in the older anime adaptation, Leorio is trapped in the Zaban tunnel after being sabotaged by Tonpa, and the sap of the Illusion Tree causes him to experience hallucinations. In this vision, Pietro appears as a young man around Leorio's age and seems happy to see him, but when Leorio looks at his face, he sees only bones. The image shocks Leorio and makes him scream, underscoring how painful the memory of his friend's death remains for him.

Pietro's role in the story is entirely tied to Leorio. He has no direct involvement in the main plot and exists solely as a figure from the past. His function in the narrative is to provide the emotional foundation for Leorio's character, giving audiences a clear and sympathetic reason for Leorio's goal of becoming a doctor. The only key relationship associated with him is his friendship with Leorio, and that relationship is defined by closeness, loss, and lingering guilt.

Because Pietro dies before the series begins, he experiences no character development of his own, and no notable abilities or combat skills are ever described for him. His significance lies in the legacy of his death: it shaped Leorio's sense of purpose, his compassion for those who cannot afford medical care, and his determination to pursue a career in medicine throughout the events of the series.