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A ghost that comes to the human world from the secret streets of the demon realm. When it's Halloween it appears and plays around as much as it wants, then disappears.
It has the IQ of a small child, but all it can say is "Trick or treat", and use exaggerated body language to get by.
Halloween ghosts share their sense with one another, so if just one of them becomes hostile, they all become hostile. If you treat them when they're trick or treating with snacks or sweets, they'll give you something in return, but will prank those who don't give them anything.
The gifts these ghosts give range from simple everyday items to rare tablets or ores, so there are people who deliberately look for these ghosts for a chance at such rare items.
"Trick or Treat!!"