Giannini is the son of Giannichi from the Vongola Famiglia that focuses on engineering. Weapon tuning, modification, and creation is no problem for Giannini's family because they have been supplying the Vongola with specialized Weapons for many generations. Giannini gets really fired up when it comes to his work and loves working on rare items. He is said to have the same traits in his work like his father. He seems to travel using a Round Machine, but he doesn't need to in the Future Arc.