Gianni has trained in Krav Maga, a form of self-defense and physical training, first developed by the Israeli army in the 1940s, based on the use of reflexive responses to threatening situations.
Gianni was diagnosed with Type 1 Diabetes at the age of 15.
Gianni has an extensive knife collection.
Gianni is an artist and is developing an original adult cartoon series.
Gianni shot a pilot where he co-starred with Mary Mouser as his older sister. They are now cast mates in Cobra Kai.