Homelander is the leader of the world’s premier superhero team, The Seven. His origin is one we've all heard: A young boy falls out of the sky, not a spaceship to his name, but even so... he fell into a prairie. How American. This is what the general consensus is, yet it couldn't be further from the truth.
The truth is that he is not an alien, rather he is a man that was given extreme amounts of Compound V from the time he was a fetus. His mother was a mentally challenged woman who was killed off as soon as he was born. Black Noir was the first of these experiments, which they did seven times - thus The Seven was born.
Homelander often treats people terribly, and because of his powers, he can do whatever he pleases. It is believed that he is the superhero that raped Butcher's wife and got her pregnant resulting in the child causing her death.