I know what I'm about to say people are going to hate, but I've always loved this idea.
It centers around a new Character, that is supremely powerful but young. He was an orphan found by J'onn J'onnz, back when he was on the police force. Intrigued by the young boy's immunity to Telepathy, Manhunter raised him, unbeknownst to anyone else. He named the boy Avarice. When Avarice was 15, he left J'onn to travel around the world on his own. In his travels, he gained more power, as well as gaining friends. These friends include Tim Drake, Beast Boy, a romantic prospect in Cassie Sandsmark, and a powerful wizard who was released from his prison by Avarice. Years later while he was apprehending a criminal, Avarice lost control of his considerable power, and destroyed a whole town.
The JLA investigated, Manhunter being one of the group, found the culprit to be Avarice. A fight between Superman, and Avarice insued. When Superman was regaining his footing from a punch, Avarice pleaded out to J'onn for help. He was underpressure from not only Superman, but Wonder Woman as well. Finally when it seemed like Avarice would die rather then admit defeat, Manhunter stepped in and protected him. A JLA, unwanting to fight their comrade, shunned Manhunter from the team, and left.
Avarice and Manhunter reconciled, and created a new organisation. They Recruited Wondergirl, Robin, and the Wizard Avarice let out.
The series would be based around the teams adventures, as well as Avarice's history. Such as why he's so powerful, and who exactly is he.
Oh well, I would enjoy it but then again it was my mind that thought it up. lol