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 merges with the user's weapon or becomes a new weapon (or new weapons), greatly increasing it and the user's power.
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.
Alaude's Handcuffs: Roll takes the form of a spiked Handcuff. It can multiply using the Cloud's Propagation ability and contain opponents. Its propagation speed is even faster than the Sun's activation ability. The first Cloud Guardian was said to stand apart from the Vongola Famiglia, but was most benevolent towards comrades in times of need.
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.
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.
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.
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.