|Birth:||In 1978 or 1979|
|Family and Friends|
|Education:|| Dimaggio Junior High
|First appearance:||Fast Friends (season 7)|
|Last appearance:||All Stood Up (season 8)|
Gia might be considered Stephanie’s Kimmy. Just as D.J. let Kimmy lead her astray a little at times, Stephanie got involved in a small number of wild, irresponsible things because of Gia, such as joyriding and attending Gia's makeout party when Gia's mother was not home.
And yet, like Kimmy by D.J., Gia was shaped by Stephanie. During an unknown time when her parents had been through a divorce, Gia is shown as a cigarette-smoking, rebellious pre-teen with horrible grades. She is possibly one to three years older than Stephanie, as evidenced by a comment by Michelle in the episode "Breaking Away": "Are you ready for your third year of seventh grade?", and because she said she had two years of sixth grade in the season seven episode "Fast Friends". Her horrible grades the previous year indicate she might have been held back at least once. And yet, as of early season eight, we learn that because of Stephanie, Gia has stopped smoking, became more respectful, improved her grades, and lost her inclination to play pranks on other people.
Gia can be described as a leader in some ways. She briefly performed in a band with Stephanie and Kimmy that failed miserably because the girls paid more attention to their appearance than to rehearsing. Despite being a relatively minor character, Gia's presence showed that Stephanie, while lacking the control of the book series, still was responsible enough, and driven enough, to be a great role model to a girl who was going through some personal life issues. Gia might have led Stephanie into some temptations, but by the end of the series, it was apparent that it was Gia who was changed for the better by Stephanie.
In "Stephanie's Wild Ride", she and Stephanie meet two boys at the mall, and the boys take them out for a drive. When Stephanie is invited for another drive, D.J. stops her from going. Later Stephanie finds out that Gia got into a car accident, along with the two boys. They are all injured but, all survive.
- It is noticed that she hopes that Danny Tanner and her mom Claire, get married
- She used to ditch school numerous times, and got her "friends" to ditch too