The Ghost Brother
What if Danny Phantom and Dick Grayson were brothers? Richard and Daniel Grayson lost their parents and were both taken in by Bruce Wayne. They were trained to fight by his side until Dick and Bruce had a falling out and Dick left, leaving Danny with Bruce. But while on a mission Danny is knocked out and gains amnesia. He winds up in Amity Park and is taken in by the Fentons. After an accident with the Fentons ghost portal, Danny gains ghost powers, as well as some of his memories. Danny begins to search for his missing brother but, unbeknownst to him, Danny is being hunted himself.
Disclaimer: I do not own Danny Phantom, Teen Titans, Batman or the cover image.