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Character:

Hayato Gokudera is a 14-year-old transfer student from Italy who was placed in Tsuna's class.He keeps various explosives hidden on his body and uses those explosives liberally by lighting them with a cigarette (or several) held in his mouth. Initially, he comes to Japan in order to test Tsuna's strength, and after the latter risks his life to save Gokudera, he devotes himself entirely to Tsuna, having sworn to become his right-hand man. A hot-headed and short-tempered youth, he continuously gets into fights with several of the other characters, especially to those who try to get too close to Tsuna. Despite his personality, he is considered to be a genius, excelling in his academic studies.

Source from Wikipeida