Ghost (Luigi's Mansion series)
From the Super Mario Wiki
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The ghosts are species from the Luigi's Mansion series.
Different types of ghosts appear in Luigi's Mansion: Dark Moon, the sequel to Luigi's Mansion, however, these ghosts are friendly and help Professor E. Gadd. However, when the Dark Moon is destroyed by King Boo, the ghosts turn against E. Gadd and go on a rampage, commanded by King Boo. Luigi once again comes up behind them and not only fixes what they break, but also catches them all, and repairs the Dark Moon, making them friendly yet again.
List of ghosts
Luigi's Mansion: Dark Moon
Official profiles and statistics
Super Smash Bros. Brawl trophy
Super Smash Bros. for Wii U trophy