獄寺 隼人

Gokudera Hayato was born in Italy and is 3/4 Italian and 1/4 Japanese, having a half-Japanese mother. His all-consuming ambition is to succeed as Tsunayoshi's right-hand man. Hayato first arrived in Japan to test Tsunayoshi's worthiness for becoming the heir to the Vongola Famiglia. However when Tsunayoshi saved him from his wayward Dynamite, Hayato became fiercely loyal to Tsunayoshi; admiring him to the point of extremes. 

Hayato is hot-tempered and tends to be irritable towards anyone who isn't Tsunayoshi or Reborn. He cultivates a "bad boy" image by smoking heavily, having a hostile attitude towards most people and dressing like a delinquent. However, over time, he gradually starts to open up to others. Hayato is rather superstitious and believes in "Unidentified Mysterious Animals."

Despite his rebellious image, Hayato excels in his schoolwork and aces all his tests, often tutoring his less-skilled friends such as Tsunayoshi and Takeshi. Gokudera also bases a lot of his thinking and academic prowess on mathematical theories that he develops. It is commonly assumed that he had a multitude of private tutors when he was young, as he was brought up in a rich household. 

Reborn! Wiki.