You're Not Alone (Percy Jackson/X-Men)
Percy Jackson never expected to fight in a war, much less two. When he was thrust into a world full of monsters and gods, and told that he had to save the world when he turned 16, he did so, making, and losing, friends in the process.
Then when he was 18, he was told that he would have save the world again, and this time, from itself. He did so, and the cage inside him breaks, releasing the shadows within. He expects it to be a one time thing, but when the love of his life dies and he blames himself, it becomes apparent that that isn't the case. With the only thing that held him together gone, he doesn't know what to do, and is slowly loosing himself.
When a group of weird people, and a few old friends, approach him and try to help him, will he accept their help, and maybe, just maybe, be fixed? Or will the shadows consume him, take him over, and another evil be reborn from the ashes?
Well, I guess that all depends on whether or not the world needs a hero. Whether or not the world needs PercyJackson.