You are not going to play for the best person. All his life he was a real monster. Since childhood, the character has stolen money from his weak classmates. In his student years he committed crimes, for which he was not always been punished. Even the girl left him, because he did not trust her, and therefore he went on treason, which is why they later parted. This person was trying to get rid of the complexes with the violence, to find himself even someone in this life. However, once he crossed the line...
You have to find out what a terrible sin lies in the soul of this character.