William 'Billy' Butcher is a central character in the series 'The Boys'. He is the leader of the vigilante group known as The Boys, which aims to take down corrupt superheroes who abuse their powers. Billy is known for his ruthless and uncompromising nature, driven by a deep-seated vendetta against the superheroes, particularly Homelander, who he blames for personal tragedies. Despite his harsh exterior, Butcher is fiercely loyal to his team and is willing to go to great lengths to achieve his goals, often blurring the lines between hero and villain.