Kangaryuu

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Canguro del Sereno ver. Vongola , Sun Kangaroo

Like the original Sun Kangaroo, it also has the ability to store and shoot weapons that make use of Sun Flames from its belly pouch, such as the Sereno Gloves and the Sereno Shoes. Furthermore, not only it has the Sun's Activation from inside its belly, but the double-barrel cannons can also launch Activation bullets. By undergoing Cambio Forma and fusing with Ryohei after he had received those bullets, it brings Ryohei into a extreme battle state called "Maximum Break". It was also shown capable of flying by releasing Sun Flames from its feet.

http://reborn.wikia.com/wiki/Kangaryuu_%28Version_Vongola_Box%29