Greenie

Greenies are the first ghosts that Luigi comes across in Luigi's Mansion: Dark Moon. The Greenies were originally helping Professor Elvin Gadd, but when the Dark Moon shattered, they turned against him. Greenies usually appear in groups ranging from 2-5, and have 10 HP. There is also a Gold form that expels large amounts of treasure when captured.

Abilities
Greenies attack Luigi with a short range punch that does 20 damage, similar to Gold Ghosts, and they are able to equip themselves with various objects to fight against Luigi. They can equip themselves with sunglasses to block the Strobulb's effect. They can also pick up objects (example: Keys, Pumpkins) if left on the floor for a certain amount of time. They also can use a rolling pin and pan lid (or other weapons) to increase their attack range and block the Strobulb's effect. This forces Luigi to remove the equipment or find an opportunity to use the Strobulb. Luigi can also use the Dark-Light Device on them. If used long enough, the Greenie will taunt or lift up the item on its head, allowing Luigi to stun it and capture it.

Greenies are capable of disguising themselves as mummies and suits of armor. Luigi gets around this by leading the mummies into a wall or torch to burn the bandages or to give him a chance to pull them off. For the suits of armor, Luigi has to lead them onto a rug and pull it out from underneath. They also change up their attacks sometimes. In the Old Clockworks, several Greenies are found creating mini-tornadoes to drag in Luigi and do damage. They also develop a Paranormal Shield which gives them infinite HP that can be reduced to 10 HP by waiting for the Power Gauge to build up to at least the same power level as the color of the shield, and then pressing.

Ghost Container description
''They like to tinker with things they shouldn't and wield everyday objects as weapons. First, find a way to disarm them, then stun them with your flashlight when the time is right.''

Dark Moon Quest

 * Strong Greenie
 * Gold Greenie
 * Armed and Shielded
 * Kitchen Armor (Gloomy Manor)
 * Blacksmith (Old Clockworks)
 * Hockey Player (Secret Mine)
 * Knight (Treacherous Mansion)
 * Suits of armor
 * Mummies
 * Paranormal Shielded
 * Sunglasses
 * Shovel (Haunted Towers) / Spear (Treacherous Mansion)
 * Masked (Old Clockworks) / Helmeted (Treacherous Mansion)

Luigi's Mansion: Dark Moon official website
"They may be the mildest of the spooks you'll encounter, but they can still cause quite a bit of trouble for our intrepid ghost hunter."

Other appearances
A Greenie makes a cameo appearance on the Luigi Board in Mario Party 10. On the south-western part of the board, next to a panel with revolving colored grave stones, stands a little dead tree, from one of whose branches hangs a placard on which is illustrated a Greenie. In this posture, the Greenie fulfills only a decorative job, and nothing more.

In Super Mario Maker, Greenies spawn when the player presses while his or her character wears the Professor E. Gadd costume. These Greenies do not affect gameplay.