Hayato is a member of the Vongola, and Tsuna’s first friend in the family. As a dynamite expert, he hides explosives all over his body, earning his nickname, “Hurricane Bomb Hayato.” He worships Tsuna, and acknowledges himself as the right-hand man of the tenth boss. Also, due to a traumatic childhood experience, every time he sees his older sister, Bianchi, he becomes sick, sometimes even falling unconscious.
Gokudera was born in Italy and is three-quarters Italian and one-quarter Japanese from his mother.He also learned to play the piano. At school, Gokudera is adored by many of the female classmates who view him as the "rebellious badboy."However, despite his image of a rebel, Gokudera excels in his schoolwork and aces all his tests, much to the surprise of Tsuna. Still, he idolizes Tsuna greatly and considers himself to be the perfect candidate to be Tsuna's right-hand man. In the anime, he doesn't smoke, but in the manga, he is a smoker.