This all depends on the villain. Now, I'll take the most iconic one everyone knows… The Joker The Joker started out as an engineer at a chemical company. read more
They can choose to become a hero and use the boon for the intended task of defeating the catastrophe. Or they can choose to become a villain and use the boon for their own personal benefit and agrandisment. So classical villains are fallen heroes who were not up to the task. read more