Dark Hunter by Andy Briggs
Jake Hunter was once an ordinary schoolboy with a computer. Until he discovered Villain.net. Now he is an extraordinary schoolboy with a dark side, a bad attitude and an addiction to the villainous powers he can download from the website. And when Jake Hunter - aka the Hunter - breaks out of prison, he has one thing on his mind: revenge. He is going to get his family back, avenge himself on hero Psych, who has wiped all memory of him from their minds, and then destroy heroes and villains. But both the Hero Foundation and the Council of Evil have other plans for the vilest villain the world has ever seen. Both sides want him. Who will get him?