Daniel did not have much friends while growing up and was only close to his cousins Enzo and Logan. He and Enzo bonded well in spite of their six years age difference and whenever they met both of them had serious discussions just like adults.
Nicholas knew Daniel will have to take over the Russo clan one day so he decided to expose him to the dark side of the mafia at a young age because according to him how much knowledge you have is equal to how much stronger you are .
At the age of eighteen Daniel entered the underworld and got to know this is where he will rule the world .He was very trilled when he learnt to use all kinds of different weapons and since he has a muscular frame he enjoyed heavy activities like compact, boxing and weight lifting. He was a quick learner and was able to grasp everything his father taught him.