Goob

Goobs are standard ghosts in Luigi's Mansion 3. They are the most common ghosts in the game, as well as the first ghosts to be fought in the game. They look, behave, and attack very similarly to Greenies from Luigi's Mansion: Dark Moon, as they normally act mischievous and attack by punching. Goobs have 100 HP.

Like Greenies, Goobs can also use weapons and objects to defend themselves, such as sunglasses and shields, which can be vacuumed away or pulled away with a Suction Shot. There are also gold-colored variants of Goobs similar to Gold Greenies which drop more treasure, as well as another variety that drops gems when defeated. There are also smaller variants called Mini Goobs which can be easily sucked up.

At the start of the game, when Luigi enters the Grand Lobby, there are Goobs disguised as human staff. These ghosts are seen later on in their true form the next time Luigi enters the lobby, boarding up the front doors to prevent him from escaping. Goobs are encountered normally throughout the game, usually in groups of two or more.

The end of the game reveals they were under King Boo's control through his crown gem, as they and the other ghosts quickly regain their senses once the gem vanishes from Luigi's hands as they were about to attack him. Among the rest of the standard ghosts in the game, Goobs are seen working with the protagonists to rebuild the fallen hotel through a series of pictures throughout the closing credits.