Elemental Ghost

Elemental Ghosts are spiritual entities found in Luigi's Mansion. There are three different kinds of them, and each represents another element, namely Fire, Water, and Ice. Their appearance respectively matches the elemental powers they house. They can damage Luigi while in full size, but need to directly touch him to do so. During the game, Luigi can find three different Elemental Medals, which allow Luigi to use the Elemental Ghosts to his advantage. After he found an Elemental Medal, Luigi can suck up the ghosts that match the medal with the Poltergust 3000, which charges the machine's elemental capacities. He can then shoot the element he just absorbed from the Poltergust 3000 to progress through the mansion.

Fire Elemental Ghost
Fire Elemental Ghost can usually be found near sources of heat, like fireplaces or lamps. They resemble floating flames and house the power of fire. After Luigi has the Fire Element Medal, he can shoot flames from the Poltergust 3000after he sucked up one of these ghosts.

Ice Elemental Ghost
Ice Elemental Ghosts are spirits that represent coldness, and they can mostly be found in cold places like freezers or buckets of ice. They appear like freezing clouds of fog. When Luigi obtains the Ice Elemental Medal, he can absorb these ghosts to enable the Poltergust 3000 to shoot a beam of ice.

Water Elemental Ghost
Water Elemental Ghosts are ghosts representing the element water, and as such they can be found near wet places like fountains or sinks. They look like blue blobs of water with white eyes. After Luigi gets the Water Element Medal, he can shoot jets of water from the Poltergust 3000. However, he must first suck up one of the Water Elemental Ghosts to charge the Poltergust 3000's energy.