Dino

Dīno is the 10th Boss of the Chiavarone Famiglia, which is the number three Famiglia in its Mafia alliance with the Vongola Famiglia. The Chiavarone is also one of the largest Famiglia, with over 5,000 members. Dino is a young man with great leadership skills along with great combat skills. His main weapons are a bullwhip and his pet turtle, Enzo. 

Like Tsunayoshi, Dino, at first did not want anything to do with the Mafia and was also a klutz. He became a suitable Mafia Boss after Reborn became his home tutor. He came to be known as "Bucking Horse Dino" and fixed the Chiavarone's financial problems, turning them into the third most influential Famiglia in the Vongola Alliance. Unfortunately, Dino is so devoted to his Famiglia that when none of his Famiglia Members are around, his skills decrease dramatically, and he will often accidentally hit people with his whip and fall down stairs, among other things. 

He refers to Tsunayoshi as his "little brother", and treats him as such. He is also one of the characters who refers to Nana Sawada (Tsunayoshi's mother) as "Mama". 

Reborn! Wiki.