Enzo is Dino's pet snapping turtle that expands with water. During Dino's training with Reborn, Dino asked for Leon as a result of succeeding in his training, but, instead, Leon gave "birth" to Enzo and Dino's whip. According to Dino, Enzo's biggest size is able to crush a house.
In Future, Enzo is a Regeneration Weapon Box. He "eats" people and stocks them in eggs where they regain health. He ate Dino, Uri, Ryohei, Gokudera, Giannini and Yamamoto in the anime.