Mortals. The ever-necessary cog in the wheel that is the Spirit World. Mortals feed the Spirit World with Belief, which turns into Madness and Ectoplasm, the energy source for Spirits like you.
This is where you come in, Spectre, an agent of the Bureau of the Paranormal. Your job is to keep the mortals feeding the Spirit World, while also cleaning up the various supernatural messes that occur.
As a being of pure ectoplasm, you were never part of the Material World, and so you cannot manifest directly without using a tremendous amount of energy. Often times this would use more energy than it gained, which is bad for business.
This is why The Bureau of the Paranormal has assigned you Haunters, ghosts and entities more easily accessible to the Material Plane. Its your job to use these Haunters to gather belief while keeping certain mortals in the dark about your existence. It wouldn't do well to bring a horde of Ghost Busters or Psychic Mediums to hunt you and put you all in jars.
You currently have five Haunters at your disposal. Their dossiers can be found here:
http://pastebin.com/e44JZ3nfAnd as always, what's a good haunting without proper music?
https://www.youtube.com/watch?v=QQg3FtBvokAWelcome, Spectre, to Ghost Master Quest.