Garbage Can Ghost

The Garbage Can Ghost is a large green ghost that despite its intimidating appearance does not attack directly. Garbage Can Ghosts instead simply appear out of thin air, munch on a banana from the bunch it has (all Garbage Can Ghosts seem to have a banana bunch for some reason) and throw the peel on the ground, it will then disappear.

It's unknown if Garbage Can Ghosts want Luigi to slip on the peel or if it is just a litter bug, although it doesn't matter as the bananas are still dangerous. To make matters worse Garbage Can Ghosts are often paired with other phantoms such as Gold Ghosts and Purple Punchers, so while Luigi is busy sucking them up he could end up slipping on a peel. Garbage Can Ghosts have the highest Heart Points of all non Portrait Ghosts at 40.

Garbage Can Ghosts appear in Mario Power Tennis along with some other varieties of Luigi Mansion ghosts. They throw banana peels into the court, causing players to slip.

Trivia

 * Garbage Can Ghosts appear to be a parody of Slimer from the Ghostbusters franchise. Another Mario character based on Slimer is the Slime Ghost.