Luigi's Mansion/Ghosts

Gold Ghost
Gold Ghosts are the first ghosts Luigi meets in the game, and among the weakest. They have a maximum of 10hp. They attack by sneaking up on Luigi and punching. Sometimes, these ghosts appear with hearts of fire, in which case the fire must be quenched with some Water.

Purple Puncher
Purple Punchers, as the name suggests, attack Luigi by punching him. Their punches are stronger than those of the Gold Ghosts, causing 10hp damage with each hit. They have 20hp. These ghosts may appear with frozen hearts, and their hearts must be melted before the ghosts can be captured.

Blue Twirler
Blue Twirlers have 30hp, and attack by pounding the ground heavily, causing shockwaves that cause Luigi 10hp damage if they hit him. Some of these ghosts have hearts doused in water, and must be frozen to become vulnerable.

Garbage Can Ghost
Garbage Can Ghosts do not attack Luigi directly. Instead, they appear, eat a banana, and throw the skin on the ground, disappearing soon after. This makes it more difficult to catch them, since Luigi must avoid the banana skins while trying to catch them. They have the highest HP of any regular ghost, with 40hp.

Grabbing Ghost
Grabbing Ghosts come in four different types, all attacking Luigi by grabbing him. If this happens, the player must rotate to escape. The weakest of these, the White Ghost, has 10hp, and can only impede Luigi's movement, and not harm him. The other three types all have 20hp, and can cause 5-13hp damage if they grab Luigi. Red Grabbing Ghosts appear as normal, but other types, called Mirror Ghosts (found in the Mirror Room) and Cinema Ghosts (found in the Projection Room) are invisible, and can only be seen by using either the mirror or the projector in the room.

Ceiling Surprise
Ceiling Surprises hang from the ceiling, trying to scare Luigi. They have zero HP, and so are defeated instantly if Luigi turns the Poltergust on them. A sub-species called Purple Bombers act similarly, but can attack by dropping bombs on Luigi. Both are usually found together in corridors alongside other minor ghosts.

Shy-Guy
Shy-Guys are ghosts whose main feature are the masks that shield their hearts from Luigi's flashlight. If Luigi wishes to catch a Shy-Guy ghost, he must first remove their masks to reveal their 20hp hearts. Shy-Guys often appear in pairs. They will only attack if their masks are removed, and attack by trying to pierce Luigi with a spear.

Speedy Spirit
Speedy Spirits are similar to Gold Ghosts, in that they have the same amount of health, and similar appearance, but with a light blue colour rather than orange. They do not attack Luigi, but instead fly away from him at a rapid speed. They only appear in fifteen locations throughout the game, and are therefore very valuable, but you only have one chance to catch it if you find one. They give out large amounts of cash when caught.

The Boos
A total of fifty Boos appear throughout the game, after they have been released from the Storage Room. They have varying amounts of HP, and only appear in rooms after the lights have been turned on. 35 Boos appear in rooms throughout the Mansion, and the remaining 15 form the Boss of Area 3, Boolossus. Luigi must catch 40 Boos (45 in the PAL Hidden Mansion) before he can face the final boss.

Skeleton Ghost
Skeleton Ghosts have 30hp. They attack Luigi by throwing bones at him. After throwing a bone at him, they will collapse, drift away to another location, and reform themselves. During the rebuilding process, they become vulnerable to Luigi's flashlight.

Minor ghosts

 * Mice and Bats: These appear mainly in corridors. They do not attack, and only cause damage if Luigi walks into them.
 * Gold Mice: Similarly to Speedy Spirits, these reward Luigi with cash if caught. They appear if Luigi scans wedges of cheese in certain rooms.
 * Bowler Ghosts: These often appear in corridors alongside Ceiling Surprises. They attack by throwing a bowling ball at Luigi.
 * Waiters: Two of these appear in the Dining Room. They have 10hp, and their only purpose in the afterlife is to replenish Mr. Luggs' meal.
 * Flying Fish: These small ghosts appear near fountains. They do not attack Luigi.
 * Spark: Spiky, explosive ghosts that appear in awkward locations in corridors. They explode if touched, causing 10hp damage. Can be quenched with Water.

Neville, the Bookish Father

 * Location: The Study
 * Age: 42 years old
 * Health: 100hp
 * Vulnerable when: He yawns
 * Required to complete game

Lydia, the Mirror-Gazing Mother

 * Location: The Master Bedroom
 * Age: 36 years old
 * Health: 100hp
 * Vulnerable when: The curtain is opened, letting in a breeze
 * Required to complete game

Chauncey, the Spoiled Baby

 * Location: The Nursery
 * Age: 1 year old
 * Health: 100hp
 * Vulnerable when: Struck by a large ball
 * Area 1 Boss Ghost

The Floating Whirlindas, the Dancing Couple

 * Location: The Ballroom
 * Age: Unknown
 * Health: 100hp
 * Vulnerable when: Luigi stands on the rotating, checkered tiles, as the couple twirl, and the male ghost shouts out
 * Required to complete game

Shivers, the Wandering Butler

 * Location: The Butler's Room
 * Age: 72 years old
 * Health: 100hp
 * Vulnerable: After his candles are lit in the corridor, he returns to his room, where he will sit down, and get burned
 * Required to complete game

Melody Pianissima, the Beautiful Pianist

 * Location: The Conservatory
 * Age: 26 years old
 * Health: 100hp
 * Vulnerable when: After playing one of two songs on her piano, you must answer her question correctly
 * Required to complete game

Mr. Luggs, the Glutton

 * Location: The Dining Room
 * Age: 30 years old
 * Health: 100hp
 * Vulnerable when: All his food is sucked up, he will spit fireballs at you, and become tired after a while
 * Capture is optional

Spooky, the Hungry Guard Dog

 * Location: The Boneyard
 * Age: 4 years old
 * Health: 100hp
 * Vulnerable when: Mr. Bones has been caught, he will start to eat one of his bones
 * Required to complete game

Bogmire, the Cemetry Shadow

 * Location: The Graveyard
 * Age: Unknown
 * Health: 100hp
 * Vulnerable when: Struck by a Bogmire Shadow
 * Area 2 Boss Ghost

Biff Atlas, the Bodybuilder

 * Location: The Rec Room
 * Age: 26 years old
 * Health: 100hp
 * Vulnerable when: Knocked unconscious after being struck by three punching bags
 * Capture is optional

Miss Petunia, the Bathing Beauty

 * Location: The Bathroom
 * Age: Unknown
 * Health: 100hp
 * Vulnerable when: Her bath is frozen
 * Required to complete game

Nana, the Scarf-Knitting Granny

 * Location: Nana's Room
 * Age: 76 years old
 * Health: 100hp
 * Vulnerable when: Struck by all three of her balls of wool
 * Required to complete game

Slim Bankshot, the Lonely Poolshark

 * Location: The Billiards Room
 * Age: 29 years old
 * Health: 100hp
 * Vulnerable when: Struck by three of his billiard balls
 * Capture is optional

Henry and Orville, the Twin Brothers

 * Location: The Twins' Room
 * Age: 5 years old
 * Health: 200hp (2x100hp)
 * Vulnerable when: Both are found in a game of hide-and-seek, and they begin to attack you
 * Required to complete game

Madame Clairvoya, the Freaky Fortune-Teller

 * Location: The Fortune-Teller's Room
 * Age: Unknown
 * Health: 100hp
 * Vulnerable when: Shown all five of Mario's items, her power is exhausted, and she will await capture
 * Required to complete game

Boolossus, the Jumbo Ghost

 * Location: The Balcony
 * Age: Unknown
 * Health: Not specified (15 Boos)
 * Vulnerable to: Ice, when split into individual Boos
 * Area 3 Boss Ghost

Uncle Grimmly, Hermit of the Darkness

 * Location: The Wardrobe Room
 * Age: 45 years old
 * Health: 100hp
 * Vulnerable when: He attempts to hug Luigi
 * Required to complete game

Clockwork Soldiers, the Toy Platoon

 * Location: The Clockwork Room
 * Age: Unknown
 * Health: 300hp (3x100hp)
 * Vulnerable when: They march around the room, and Luigi removes their wind-up keys
 * Required to complete game

Sue Pea, the Dozing Girl

 * Location: The Guest Room
 * Age: 7 years old
 * Health: 100hp
 * Vulnerable when: Sprayed with water three times
 * Capture is optional

Jarvis, the Jar Collector

 * Location: The Ceramics Studio
 * Age: Unknown
 * Health: 100hp
 * Vulnerable when: Struck by Ice seven times
 * Capture is optional

Sir Weston, the Chilly Climber

 * Location: The Cold Storage
 * Age: 30 years old
 * Health: 100hp
 * Vulnerable when: The ice protecting him is melted away
 * Required to complete game

Vincent van Gore, the Starving Artist

 * Location: The Artist's Studio
 * Age: 59 years old
 * Health: 100hp
 * Vulnerable when: The ghosts he releases from his paintings are defeated
 * Required to complete game

King Boo

 * Location: The Secret Altar
 * Age: Unknown
 * Health: 500hp
 * Vulnerable when: The head of his Bowser suit is removed, expelling him from it
 * Area 4 Boss Ghost, Final Boss