Cambio Forma (形態変化 (カンビオ フォーム, Kanbio Foruma; Italian and Japanese for "Form Change") is a mode exclusive to the Vongola Famiglia. Here, the Box Animal of the user undergoes a change, where it merges with the user's weapon or become new weapons altogether, greatly increasing it and the user's power.
10th Generation Guardians Version
In the case of the 10th Generation Guardians, their Vongola Boxes are transformed into Weapons used by the First Generation Vongola Famiglia members, each bearing the Roman Numeral "I".
Leone di Cieli Version Vongola
Mitena di Vongola Primo
Mantello di Vongola Primo
Modo Difesa: (Defense Mode: Mantello di Vongola Primo): Natsu changes into a long, black Cloak. The Cloak is attached to a metal plate on the X-Gloves. The Cloak's ability is to nullify attacks using the Sky's Harmony Attribute.
Modo Attacco: (Attack Mode: Vongola First's Gauntlet): Natsu combines with the X-Gloves and turns into a Gauntlet. While using this, he can concentrate all his Flames into a single attack without charging.
Rondine di Pioggia Version Vongola
Ugetsu Asari's Four Irregular Swords
Ugetsu Asari's Four Irregular Swords: Kojirou fuses with the Shigure Kintoki to create a long Sword as Jirou provides three short Swords. It was said that the first Rain Guardian replaced his musical instruments with similar weapons in order to help Vongola Primo in a time of crisis.
Riccio di Nuvola Version Vongola
Alaude's Handcuffs
Alaude's Handcuffs: Roll takes the form of a spiked Handcuff. It can multiply using the Cloud's Propagation ability and contain opponents. The first Cloud Guardian was said to stand apart from the Vongola Famiglia, but was most benevolent towards comrades in times of need.
Gufo di Nebbia Version Vongola
Daemon Spade's Devil Lens
Daemon Spade's Devil Lens: The Vongola Mist Owl transforms into a set of three Lens. These Lens enable Chrome to see through Illusions and reveal the nature of Attacks. The first Mist Guardian was said to be a man who was said to curse those he glared at through his monocle. When used by Mukuro, it allows him to view the weaknesses and statistics of the enemy.
Leopardo di Tempesta Version Vongola
G's Archery
G's Archery: Uri combines with the Flame Arrow, creating a longbow made of bones. This Weapon can fire bursts of Storm Flames as well as several Storm Arrows at once. The first Storm Guardian was given a similar weapon from his childhood friend, the Vongola Primo Giotto.
Bovino di Fulmine Version Vongola
Lampo's Shield
Lampo's Shield: Gyuudon takes the form of a shield and helmet with the Lightning Crest. As well as Defense, this form can also fire out a Lightning explosion. The first Lightning Guardian was said to be a coward and a son of a rich man from another Famiglia who had to be forced into battle.
Canguro del Sereno Version Vongola
Knuckle's Maximum Break
Knuckle's Maximum Break: Kangaryu transforms into a pair of boxing Gloves, and headgear with the Sun emblem in the middle. It improves the speed and power of a punch. The first Sun Guardian turned religious after accidentally killing a man, but allowed himself three minutes in a boxing ring in order to save his fellow Guardians.
Version Varia
Ligre Tempesta di Cieli
Animal Gun Emperor: Bester merges with a pair of X-Guns and causes their form to somewhat resemble Bester, Xanxus also gains the ability to shoot bullets in the shape of a liger.