3 Boys, 3 Lives, 3 Brothers

Percy Jackson
He had a great life, until he got betrayed. He decided to go to Gotham. Either to die... or to hero and find his brothers.
Danny Phantom
He had an okay life, until his parents found out his secret. Dan killed everyone in Amity park, and Danny couldn't stand living there anymore. He went to Gotham to either die finally... or to become a good hero and find his brothers.
Dick Grayson
He has always been sad. He just hid it well. He had a deep depression, ever since his parents died, and his brothers were taken away. He could only wish and hope, that his brothers were still alive, they came to Gotham, and that they still remembered him.