An intriguing superhero from the Golden Age, Ghost Boy epitomises teen angst long before it was a fashionable concept. He's insecure and feels out-of-place whether he's with his school-mates or with other superheroes or hanging out with the ghosts that his powers allow him to see and interact with.
This would be an interesting character for a strong role-player to play, to explore the way in which Ghost Boy develops as he discoveres how to use his abilities to be a valuable member of a group of superheroes rather than the weedy and barely-tolerated 'cute mascot' that he feels himself to be... or perhaps one of your characters would like to mentor him and help him discover his true place in the world.
Alternatively, he could be run as a villain, working on the edge of the supernatural and helping ghosts to wreak vengeance on the living...
A neat and interesting look at a character who is not all power and strength and useful in a brawl, a more subtle yet still potent ally or enemy.