Her namesake -as well as the one for her teddy bear- is a character in the anime series, 3000 Leagues in Search of Mother. During the character select screen in the newest Metal Slug pachislot, she is given the logo "La torta deliziosa di Fio" (The delicate/delicious cake of Fio) with a caricature of a giant version of herself pointing a gun at a city. Her nickname in the same game is "Teatime in the Battlefield".
The Germi family is widely known for their wealth and service in the military. The Germis were originally merchants who made their fortune in the Mediterranean region during the age of exploration, and still remain wealthy through their management of various corporations. They also have distinguished their role in the military in the past, first in the Napoleonic War in 1800s, then the Italian Unification Wars in the 1900s, and other various modern-day wars plagued with terrorism around the world. Many of the Germis who fought in the wars lost their lives, and it soon became a necessary custom for the chosen heir of the Germi family to serve in the military.
Fio's father, Alessandro Germi, was once a fearsome soldier during his earlier years. His body bore the scars from wounds to prove that he had seen his share of blood out on the battlefield. After he returned to his civilian life, he skillfully restored the failing family business, marking him as the savior of the Germi family.
Despite Alessandro's dire wish to give birth to a healthy son, he was surprised to find out that his wife had given birth to a daughter, and the fact that his wife could not give any further birth due to health complications.
He did not want to send his only child off to battlefield risking her life, and yet he couldn't ignore the Germi's military customs, either. So he ends up sending his daughter off to the military at the age of 20, but tries to keep her from going out into battles by assigning her to desk jobs using his connections and friends made during his stay in the military. However, all that came to a screeching halt when a paperwork mistake caused by ridiculous bureaucracy in the military had gotten Fio transferred to the Sparrows unit, a special operations branch of the Regular Army's Intelligence Agency that frequently carried out much more dangerous tasks than almost any other units in the military. Furious, Alessandro often waltz into military headquarters to keep his daughter from being shipped to the front by threatening the officers. And in the event that Fio did get sent out, he would use his own private jet to extract her out of the battlefield. People around him began to stop what he was doing, preserving the Germi family's historical service in the military, and thus preserving the entire Germi family line.
Fortunately, Fio manages to survive the battles that she fought in by keeping her head low, including several of the battles that occurred during Morden's attempts for world domination, and rapidly climbs up through the ranks.
A clever girl, Fio is also very friendly in spite of her family's background. Strangely, she still remains calm, mild, and childlike even with her extensive military experience. She always thinks optimistically.
She was trained in hand-to-hand combat by the military, but she doesn't quite know how to fight. In KOF: Maximum Impact 2, she excels in keep away tactics with her short yet simple combos. She can use a gauge of her super bar to also whip out twin tonfa to boost her attack damage. Fio is also armed with a hand axe, fire bombs, grenades, and two heavy machine guns.
- Kanako Morikado - The King of Fighters '99 Evolution and 2000
- Ryoko Nakano (credited as Aikel) - KOF: Maximum Impact 2
- Melissa Ex - KOF: Maximum Impact 2 (English voice), Metal Slug 3D
- Metal Slug 2
- Metal Slug X
- Metal Slug 3
- The King of Fighters '99 Evolution - As a Striker
- The King of Fighters 2000 - As a Striker for Vanessa
- Metal Slug 4
- Metal Slug 5
- KOF: Maximum Impact 2 - unlockable
- Metal Slug 6
- Metal Slug 3D
- KOF Maximum Impact Regulation A
- Metal Slug 7
- Metal Slug Zero Online
- SNK vs. Capcom: The Match of the Millennium - Olympic mode only
- The King of Fighters: Battle de Paradise - as a striker
- Metal Slug (pachinko)
- Metal Slug SV-001 (pachinko)
- Metal Slug 3 (pachinko)
- Days of Memories (second title) - unplayable
- NeoGeo Tennis Coliseum
- SNK Gals Island Dokidoki Puzzle Shock!
- SNK Gals Island Senkan Battle Gekichinshichaouzo!
- Metal Slug Defense
- Metal Slug Attack
- The King of Fighters XI - background cameo in PS2 port
- The King of Fighters XIII - in the Egypt stage
- The King of Fighters XIV - in the Ikari Warriors Team ending
- SNK vs Capcom: SVC Chaos - during Mars People's ending
- Neo Geo Battle Coliseum - in one of Marco's winposes
- The King of Fighters '94: Rebout - background cameo in the Women Fighters Team stage
- The King of Fighters 2002: Unlimited Match - background cameo
- Garou Densetsu Special
- Samurai Spirits Gaiden: Cham Cham