Ghost Guy

Ghost Guys (originally known as Shy Guys ) are ghosts that appear in Luigi's Mansion. They appear in a multitude of colors, wear eyeless Shy Guy masks, and are equipped with pitchforks resembling those carried by Beezos from Super Mario Bros. 2 and the non-Mario game Yume Kōjō: Doki Doki Panic. When Luigi uses the vacuum on them, the masks come off revealing two yellow eyes and a small black hole for a mouth that are actually set on the hoods that they wear. Removing their masks also allows them to be stunned with the flashlight and vacuumed. They have 20 HP.

There are two types between the colors: red and green Ghost Guys wear plain white masks and will pursue Luigi slowly, with the red type jabbing at him and the green type twirling the spear when close enough. They appear in the Astral Hall. Pink, purple, orange, yellow, and white Ghost Guys wear red and white masks (the same colors as a Phanto) with drawn on mustaches, and dance in pairs in a circular motion, with one occasionally swinging its spear in a circular motion for the other to duck under. This type is called a Dancing Ghost Guy in the remake. If Luigi captures one in a pair, its partner will pursue him like the red and green types, only spinning the spear to attack. A group of dancing Ghost Guys appear in the Ball Room, where the Floating Whirlindas appear after Luigi catches them, and on the Roof near a fire.

Both standard Ghost Guys and dancing Ghost Guys are more widespread enemies in the PAL version's Hidden Mansion.

Luigi's Mansion (Nintendo 3DS)

 * In-game description (Ghost Guy): "A masked ghost who attacks with a spear."
 * In-game description (Dancing Ghost Guy): "One of a pair of dancing Ghost Guys who attack as they twirl."

Trivia

 * Aside from the colors seen in-game, there are unused models for cyan and blue versions.
 * The noises produced by Ghost Guys, particularly the dancing ones, are recycled as the primary noises for Shy Guys in general in later games.

Reference
Shy Guy (Geist) Tipo Spettro (Luigi's Mansion)