Originally Posted by seibert999
what about avatar, it had actually ending to the show but is getting another show
Notice how that show COULD have another series. Since there will always be another avatar after Aang, and before him, however, if more than one half ghost shows up, then that's stupid, the fact that there were 2.5 half ghosts(Dannie is the half), was just stupid as it was.
Plus, its clear that the world of avatar has a lot of stories, while Danny Phantom has just the one.