This is the most common ghost to be found. So common, it doesn’t even have a name. Most others ghosts have more identifiable features and have been cataloged by the Bureau. Where you are could very well affect what ghosts you find. How many different types can you identify? For now, we know that one need not travel to other cities to find all the ghost types identified but migration paths in the future may change this.
The Bureau advises immediate action to capture all forms before this happens. Otherwise, we’re going to end up doing it the hard way.