Hider

Hiders are blue ghosts that first appear in Luigi's Mansion: Dark Moon. Per their name, these ghosts tend to hide in furniture or other objects, and flee to another spot if found. Hiders appear in groups of at least two, and always attack alongside other ghosts. They have 15 HP, but they have high speed.

At the end of the game, like all of the other ghosts, they regain sanity and become friendly again as a result of the Dark Moon's restoration.

In Luigi's Mansion 3, a similar, but more aggressive enemy known as an Oozer appears.

Abilities
Hiders throw objects at Luigi while hiding inside furniture or objects, doing 10 damage. They will move to new hiding places periodically, especially if their current spot is revealed. Sometimes, they throw banana peels to make Luigi slip. Luigi has to be quick in capturing them, due to their speed.

Ghost Container description
''These clever fellows love playing hide-and-seek. A bit impatient, though, so if you take too long to find them, they'll start throwing things at you! Stay on your toes!''

Trivia

 * Hiders are the only normal ghosts that do not have ScareScraper boss versions of themselves, though normal versions are encountered there.
 * A Hider was the reason Professor Elvin Gadd spilled his coffee on Gooigi, which caused him to turn green and stabilize into a goop form, which E. Gadd calls "Goo."

Occultino Versteckler