Leone di Cielo Version Vongola (Lion of Heaven Version Vongola) is the Vongola Box Weapon of Tsunayoshi Sawada and is named Nuts or Na'tsu (in anime). When released properly, the Vongola Sky Box contains a small, immature Lion that acts like its master in and out of battle, going from a serious and powerful Animal to a timid and easily frightened Lion Cub. This Box Animal is very similar to Xanxus' Box Weapon, Ligre Tempesta Di Cielo a.k.a. Bester in its Ability to create a roar infused with Sky Flames that can paralyze other Box Weapons. Nuts is not only an Animal, but also a weapon in that it can perform Cambio Forma or in this case Cambio Forme (Change Form in Italian).
- He is a reconstructed Leone di Cieli made especially for Tsuna's use.
- Made with Vongola's newest technology.
- The Sky Roar can petrify enemies on the battle field, just like Leone di Cielo.
- His most special characteristic is changing form to the Weapon of Vongola Primo.
- Its still in the process of growing, and Tsuna calls him Nuts.
- He, along with other Vongola Boxes, were made by the Future Tsuna.
Attacks and Abilities
- Roar: Using its Roar, the same as Leone di Cielo, sends the Sky Flame's Harmony characteristic at its opponents. Nuts uses its roar to harmonize Torikabuto's Rete Serpente di Mare, rendering its construction characteristic useless, and allowing Tsuna to burst through.
- Cambio Forma:
- Modo Ofesa: Mitena di Vongola Primo (Attack Mode: Vongola First's Gauntlet): In this transformation, Nuts combines with Tsuna's X-Gloves and turns into a Gauntlet. As with the First's Cloak, the Gauntlet also has a Roman Numeral I on it. While using this, he can concentrate all his Flame into a single attack without charging called "Big Bang Axel". With the Original Sky Vongola Ring, the Gauntlet becomes longer with spikes and delivers a more powerful attack, called "Burning Axel".
- Modo Difesa: Mantello di Vongola Primo (Defense Mode: Vongola First's Cloak): Nuts changes into long, black Cloak that releases Sky Flames. The Cloak is worn by Tsuna, and is attached to a metal plate on his X-Gloves and bears the Roman Numeral I. The Cloak has the Ability to nullify Attacks. With the Original Sky Vongola Ring, the Cloak has greatly improved Defensive capability.
- In chapter 42 when Reborn wanted a pet for Tsuna, he suggested a lion.
- Nuts was Tsuna's first and only Box Weapon so far, being that Sky Box Weapons are incredibly rare to mirror the rarity of pure Sky Flames.
- The katakana for Nuts, "Na'tsu," is a reverse of Tsuna's name in katakana.
- In the anime his name is pronounced Na-Tsu.
- When this Box Weapon is opened incorrectly, it is shown to be a monster.
- He was mistaken to be a Cat by Enma Kozato.
- He is friendly towards Enma.