|1999 - 2011|
|Debut:||Chapter 7; Episode 7 (1999); Episode 4 (2011)|
Pietro (ピエトロ) was a close friend of Leorio. He died from a debilitating illness. Leorio is deeply sorry about his inability to save his friend as the illness was curable but required a surgery he could not afford. Thus, he has a strong desire to become a doctor and takes part in the 287th Hunter Exam to achieve it.
- Pietro is his name in the 1999 anime adaptation only. It has never been mentioned in the manga or the 2011 anime adaptation.
- Pietro died an adult in both anime adaptations.