The king of the Boos and primary antagonist of the series.
See here for a list of his tropes.
The Jumbo Ghost. The third boss ghost to fight and the sixteenth Portrait Ghost fight.
- Asteroids Monster: It's a massive Boo made up of 15 smaller Boos.
- Boss Arena Idiocy: The unicorn statues, which are used to split him so you can freeze and suck up the individual Boos.
- The Dragon: To King Boo. Its capture is what leads King Boo to release the Portrait Ghosts.
- King Mook: Boolossus is just a really, really big Boo.
- Punny Name: Like every Boo in the mansion, this one being a portmanteau of "Boo" and "colossus."
- You Don't Look Like You: The Big Boo fought in Dark Moon is actually said to be Boolossus in the Japanese version of the game. However, it noticeably lacks Boolossus's undershadowed, glowing eyes. It has them back as the boss of the Scarescraper in 3, though.
- Adorable Evil Minions: Especially in Dark Moon, given that the Boos have adorable voices. Doesn't stop them from carrying out mischievous deeds though.
- Gotta Catch 'Em All: Luigi has to collect most, if not all, of the Boos in order to decrease King Boo's power enough to stand a chance against him. You need 5 to get the Toad in the first floor washroom, who has the key to Clairvoya's room, to let you in, you need 20 to banish the "mysterious power of the Boos" that guards the door to the Area 3 boss room, the third floor balcony, and 40 total to reach the door to the final boss; getting all 50 awards Luigi with a Gold Diamond, the most valuable treasure in the game.
- Our Ghosts Are Different: They're explicitly said to be different from other ghosts. They show this mechanically by being much more resistant to the Poltergust than normal ghosts, requiring more unique methods to be defeated and captured.
- Punny Name: Roughly every Boo has a word or name with "Boo" in it. One's even named after Luigi (Booigi).
Ghosts of the Mansion
The ghosts in Luigi's Mansion.
- Art Initiates Life: All of the non-animal ghosts are paintings brought to life by Vincent Van Gore. Capturing him stops them from appearing in the remaining dark hallways.
- Jump Scare: Quite a few of them make their entry by suddenly appearing behind Luigi and roaring at him.
- Money Spider: There are other types of ghosts that drop large amounts of cash (the Speedy Blue Spirits and Golden Mice).
- Our Ghosts Are Different: Some behave exactly like ghost versions of animals (bats, mice), whereas others are monsters of various shapes that came from Van Gore's paintings.
- Perpetual Smiler: Most of them have big smiling faces that don't change even as they're being sucked up.
- Yellow Eyes of Sneakiness: All of them tend to have bright yellow eyes and love nothing more than causing misfortune for Luigi.
The most common type of ghost found in the mansion. They come in two other variants: white, fiery Temper Terrors that must be doused with water before they can be caught; and blue, rare Speedy Spirits that dart around the room the moment they're found, and yield tons of treasure if caught.
- The Goomba: They're the most basic form of ghost, and pretty easy to catch.
- Metal Slime: Speedy Spirits drop a lot of cash when they get vacuumed up. They're always hiding in furniture in dark rooms though and won't appear if the lights are already on.
- Playing with Fire: Temper Terrors. Their flames can be snuffed out with water, which will continue to damage them if you keep spraying them.
Tall and skinny ghosts that move in a long, straight line to throw punches. Their white, icy cousins are called Flashes, and can't be caught until you melt their hearts with fire.
- An Ice Person: Flashes have to have their icy hearts thawed before they can be stunned, and take damage from fire.
Blue Twirlers are large and bulky ghosts that slam the ground to create shockwaves, dealing devastating damage to Luigi. They have a white, watery variation called Blue Blazes, which have to be frozen with ice before they can be caught.
- The Brute: They're huge, they use brutish force, and have a lot of health.
- Making a Splash: Blue Blazes' watery hearts have to be frozen first. Ice will continue to lower their health if you keep blasting them.
- Shockwave Stomp: They put their oversized fists to good use, slamming the floor to create shockwaves.
Grabbing Ghosts slowly creep up to Luigi and grapple him. The white ghosts are otherwise harmless, but the red ones squeeze him and deal damage. There are also two invisible, damage-dealing variants: the blue Mirror Ghost, which can only be seen as reflections in mirrors, and purple Cinema Ghosts, which cast shadows from projector lights.
- Personal Space Invader: As implied by their names. They need to be shaken off if they manage to grab a hold of you. The first ones you meet in the downstairs bathroom are white and only restrain you (they're only a danger if other ghosts are in the room with them), but the red ones drain hitpoints and money when they latch on. There are also invisible ones in the mirror room and projection room which are like the red grabbers.
A ghostly variation of Shy Guys. Luigi's flashlight won't stun them until their masks are removed. Dancing Ghost Guys usually move in pairs, and are best caught at the same time if possible.
- The Faceless: Even moreso than the usual Shy Guys, lacking eyeholes. That said you have to remove their masks to render them vulnerable to the flashlight, though it only reveals a pair of glowing eyes under the hood indicating that they may literally be faceless
Ghostly skeletons that toss their own bones at Luigi before falling into a heap on the ground, making them vulnerable.
- Dem Bones: Skeletal ghosts found in the Boneyard, Graveyard, and Telephone Room (second trip in after the lights come back on). The ones in the yards are mandatory fights (to be able to capture Spooky, the ghost dog, so you can enter the Graveyard, and then to be able to fight the second boss ghost, Bogmire.
Garbage Can Ghosts
Ghosts shaped like garbage cans. They are always seen eating bananas and throwing their peels on the ground, which will cause Luigi to slip and lose health if he steps on them.
- Banana Peel: They weaponize these, tossing them out to trip up Luigi. It's their only attack and it only does a weak five points of damage, but it can break Luigi's hold when he's wrangling a ghost. And when they show up alongside other ghosts... watch your feet!
- Green and Mean: Their skin is a dark green tone and they love to send Luigi tumbling.
- Shout-Out: Their design and habit of eating, on top of their green color and yellow eyes, make them look a lot like Slimer. They're also vaguely Kong-like and love bananas.
- Stone Wall: These fellows have the highest health out of all the normal enemies, beating out the 30 health points of the Blue Twirlers with a whopping 40.
Ghosts that are usually found in long hallways and corridors, where they drop down from the ceiling. The white Ceiling Surprises don't do anything besides startle Luigi, but their cousins, the Purple Bombers, always drop bombs. They have 0 HP.
- Peek-a-Bogeyman: The white Ceiling Surprises as their name implies exist solely to Jump Scare Luigi. Averted with the Purple Bombers who actually try to hurt Luigi with their bombs.
- The Hyena: They let out maniacal laughter every time they pop up.
- Troll: The white Ceiling Surprise ghosts do nothing but scare Luigi and laugh about it.
Yellow ghosts that roll bowling balls down hallways towards Luigi. They have 0 HP.
Waiter ghosts that exclusively appear in the Dining Room to refill Mr. Luggs's plate if Luigi sucks up his food.
- Harmless Enemy: The only ghosts that never try to antagonize Luigi at worst bumping into him as they try to deliver food to Mr. Luggs.
- Screw This, I'm Outta Here!: If you completely suck up the food on Mr. Lugg's plate without sucking them up first, they flee in terror to escape his wrath.
- Unique Enemy: Only two of them appear in the entire game and only in the Dining Room.
Tiny ghost creatures that are easily popped into Luigi's vaccuum: Mice, which scurry across floors and walls; Bats, which swoop down from the ceiling; Flying Fish, which constantly dart around the air; Sparks, which self-destruct when sucked up or left alone; Shining Ghosts, which Luigi must fire at the moon in the Observatory; and Elemental Ghosts, which start appearing after specific elemental medals are acquired and can be sucked up to grant the Poltergust 3000 elemental abilities.
- Metal Slime: The Gold Mice which drop a lot of cash if successfully caught. They only appear in dark areas with half of them spawning from examining
Portrait GhostsBoss ghosts captured in portraits in Luigi's Mansion.
- Early-Bird Cameo: You can find paintings of Neville, Lydia, Mr. Whirlinda, Nana, and Vincent Van Gore when they were alive in the first room you unlock in the mansion. It is even possible they are the ghosts who taunt you in that room when you return with the Poltergust.
- Jerkass: You'd feel a lot worse about sucking up a bunch of ghosts who are mostly minding their own business if they weren't so unpleasant and even downright sadistic. Madame Clairvoya is the only one to avert this.
- Reluctant Monster: Downplayed. None of the human-born ghosts attack you when you first encounter them aside from Neville, and even then, it's ambiguous if he's directing the books or they're attacking on their own. The rest only start attacking once you anger them in some fashion, be that as petty as being accused of cheating at hide and seek to sending them into a nervous breakdown over a phobia, or physically attacking them first. That being said, their thoughts indicate they're all varying degrees of Asshole Victim, outside of Madame Clairvoya.
- Bookworm: Found in the library. According to his bio hes reading all the books he missed while alive.
- Irony: His comments on how Luigi cant see him are exposed to the reader while examining his heartas in, while Luigi can see him.
- Throw the Book at Them: His only mode of attack when fought, unless you sucked it up already.
The Mirror Gazing Mother. The second Portrait Ghost fight.
- Monster Is a Mommy: A variant after defeating Lydia, the player is treated to a cutscene with Chauncey crying from the next room, which is also the boss room of Area 1 (the cutscene doesn't play if you use Lydia's mirror to warp back to the foyer).
- Narcissist: Aside from the usual ghostly lack of empathy towards the living, shes so wrapped up in herself that she traded an eternity of sitting in a portrait for an eternity of sitting in front of a mirror brushing her hair. The wind from outside disturbing her hair is the only way to distract her and make her vulnerable.
The Spoiled Baby. The first boss ghost fight and third Portrait Ghost fight.
- Enfant Terrible: A baby ghost who asks Luigi to play when he shakes his rocking horse (even going so far as to lock Luigi in his nursery). This involves throwing things at him and trying to belly-flop onto him.
- Goo Goo Godlike: This baby ghost is the first boss fight.
- Reality Warper: Shrinks Luigi down to an incredibly tiny size and transports him to a bizarre plane of reality located on his crib for the boss fight.
- Spoiled Brat: As implied by his naming. He throws reality warping temper tantrums if his demands arent met.
- Tactical Suicide Boss: One of his attacks involves tossing giant balls at Luigi in an attempt to crush him. Luigi can then use the one ball that remains to hit him (which is also how you get into the boss fight when you wake Chauncey). This does not discourage Chauncey from using the attack.
- Undead Child: According to his bio, he was never alive to begin with.
- Wake-Up Call Boss: Chauncey is the first real test of Luigi's ghost-catching skills.
The Floating Whirlindas
The Dancing Couple. The fourth Portrait Ghost fight.
The Wandering Butler. The fifth Portrait Ghost fight.
- Dirty Old Man: He's 72 and has a crush on the 26-year-old Melody. Downplayed as he isn't shown to be perverted to her, and tries to court her nobly.
- Weaksauce Weakness: He's terrified of fire so much that he runs at the mere sight of it. Lighting the candlestick in his hand terrifies him and drives him to his room, where you can capture him.
The Beautiful Pianist. The sixth Portrait Ghost fight.
- Affably Evil: Downplayed. She's got a nasty temper and her two heart quotes portray her as arrogant in her skill and dismissive of Luigi based solely on his physical appearance. Still, she warms up to him quickly when she realizes he has some skill in music and is rather polite towards him so long as he doesn't push her Berserk Button.
- The Beautiful Elite: Played with. A master pianist renowned for her beauty and skill and garbed in elegant clothes, but harboring both an obsession with video games and a foul temper.
- Berserk Button: Shes a massive fan of games, and if you cant recognize which game tunes shes playing on her piano, she throws a tantrum, banging on the keys with her fists. She'll then promptly disappear, and you'll have to leave the room, come back in, and replay the instruments to talk to her again.
- Elegant Classical Musician: She is the Beautiful Pianist for a reason.
- Gamer Chick: The melodies she plays are from various Mario games.
- Meaningful Name: Melody refers to the main line of music in a composition, and Pianissima is a reference to pianissimo (to play softly).
- Mini-Boss: The first to appear in the game (and surprisingly the only one with a unique Battle Theme Music). After you answer her question, she will throw music sheets in a last-ditch attempt to defeat Luigi. She becomes an easy target afterwards, though.
- Noblewoman's Laugh: Pulls one of these off if Luigi correctly recognizes what game the music she's playing comes from.
- Paper Master: Attacks with music sheets. Suck them up to get a crack at her.
- Worthy Opponent: She's impressed if Luigi recognizes the song she plays and decides that she doesn't have to hold back her "musical genius" against him.
The Glutton. The seventh Portrait Ghost fight (and the first optional one).
- Bad Boss: To the two waiter ghosts who rush around in a panic trying to refill his plate as you vacuum it up. If you empty the plate without getting rid of them, they'll flee in utter terror to escape his wrath.
- Berserk Button: Taking his food away is cause for spitting fireballs at Luigi, apparently.
- Big Eater: So much so that he died from overeating and still wasnt satisfied.
- Breath Weapon: Anyone who takes his food away has to deal with him breathing his heartburn on them in balls of fire.
- Death by Gluttony: The bio doesnt specify whether it was his girth that killed him or the copious amounts of food he ate, but ate himself to death likely qualifies.
- Fat Bastard: He's not only a nasty glutton, but also ill-mannered. Removing his food from the table will upset him and start the fight between him and Luigi.
- Mini-Boss: Notably one of the most relentless in the game. He will spit up to fifteen fireballs at Luigi, including cooldown periods in-between, before meeting fatigue (which is when Luigi can start capturing him).
- Playing with Fire: Once you take his food away, he will start heaving fireballs towards you. Dodge them until he tires, then you get your shot at him.
- Skippable Boss: You can just walk right past him and head for the kitchen, unless you want the best rank, the pearls Mr. Luggs drops, the Boo in his room (you cannot prompt a Boo out of hiding in a room unless the lights are on), the treasure he guards, including a Silver Diamond, and one of the two Golden Diamonds in the game (by way of catching said Boo; you need all 50 in the house to get that diamond).
- Villainous Glutton: Repulsively fat, unkempt, and having absolutely horrible table manners. Tries to kill Luigi if his meal is taken away.
The Hungry Guard Dog. The eighth Portrait Ghost fight.
BogmireThe Cemetery Shadow. The second boss ghost fight and the ninth Portrait Ghost fight.
- Blob Monster: Its form gives the appearance of perpetually dripping.
- Casting a Shadow: Literally; he uses shadows of himself as his attack, and you have to use them back on him.
- Eldritch Abomination: Much more monstrous in appearance than the other portrait ghosts, this is no doubt because rather than being a spirit of the deceased he is instead a specter born from the fear and despair made by the mansion.
- Flawless Victory: In the Hidden Mansion, you have to catch Bogmire without bumping into one of his shadows even once to get a Gold frame (the shadows do 10 hearts worth of damage, which is doubled in the Hidden Mansion; you need 90 hearts left after the fight).
- Flunky Boss: An interesting variant, as the flunkies are all replications of itself, which are also your weapons against him.
- Living Shadow: Appears out of the shadow cast by a lightning strike. Its duplications in the boss fight are also these.
- Made of Evil: The product of the mansions fear and despair.
- Teleport Spam: In the PAL and 3DS Hidden Mansions, he only remains on screen for three seconds after making a clone, making it far harder to stun him.
- The Speechless: He is the only Portrait Ghost who isn't capable of speech.
The Body Builder. The tenth Portrait Ghost fight (and optional).
- Berserk Button: Getting hit by his punching bag, which gets him on your tail (the bag can also hurt YOU if you let the rebound hit you).
- Jerk Jock: He calls Luigi a "weakling" and says he'd like to use him as a punching bag. Oddly enough, the game guide describes him as a "kind bodybuilder."
- Meaningful Name: Biff is either a pun on buff or the slang term to hit, which is appropriate since Biff is one of three ghosts in the house (Sir Weston and the house's final boss are the others) that can do 20 hearts (one-fifth of Luigi's health) worth of damage if he decks the plumber. Atlas is the name of the Titan from Greek Mythology who holds the world/sky on his shoulders, and is also a reference to famed bodybuilder Charles Atlas.
- Muscles Are Meaningful: He's one of three ghosts that can take off a fifth of your health if he punches you; the other two are Sir Weston and his icicles and the final boss's body. He also has to be hit three times by the punching bag before he gets stunned and can be sucked up.
- No Celebrities Were Harmed: A parody of Arnold Schwarzenegger in appearance, vocal mannerisms, and strength.
- Real Men Wear Pink: Likes lilies because they represent purity.
- Skippable Boss: You can simply walk past him without any repercussions, minus a lower rank, a bunch of additional treasure, and the Rec Room's resident Boo.
- Top-Heavy Guy: His pectorals are so enormous, it can be assumed that even if he did have legs, they wouldnt offset how huge his chest is.
The Bathing Beauty. The eleventh Portrait Ghost fight.
- Bathing Beauty: Her bio states that she used to be one of these. Nowadays not so much, although she retains her love of bathing.
- Fan Disservice: Before you pull away the curtain, you see a beautiful and thin woman bathing. Open the curtain, and you get an incredibly fat woman in a bikini with a pig face.
- I Was Quite a Looker: She was the "Miss Ghost" runner-up six years before the events of Luigi's Mansion. Since then, she has let herself loose. In addition, her Sexy Silhouette is possibly how she looked then.
- Making a Splash: If you don't spray her with ice as soon as possible, she will shoot scalding bath water at you, which takes 5 hearts and amusingly drenches Luigi, who ultimately shrugs off the hot water as if it was nothing.
- Non-Nude Bathing: Obviously, given that it's a game for all ages, she's wearing a bathing suit.
- Sexy Silhouette: When the curtain is pulled this is what she has.
The Scarf-Knitting Granny. The twelfth Portrait Ghost fight.
- Eye Beams: One of her methods of attack.
- Granny Classic: Played with. A largely demure lady who knits constantly, but also likes to play pranks in her spare time.
- The Prankster: One of the books in her room talks about a prank she pulled on Miss Petunia by pouring ice into her bathtub, giving you a clue on how to expose Petunia's heart.
- When Elders Attack: Being a ghost, she attacks Luigi. The effectiveness depends on the player. Miss with one of her yarn balls, and she laughs and vanishes, forcing you to re-enter the room; she is not optional since she has the key to Henry and Orville's room, and they have one of the items that Clairvoya needs to get you the key to the third floor.
The Lonely Poolshark. The thirteenth Portrait Ghost fight (and an optional one).
- Bad Guys Play Pool: Found in the billiard room getting ready to make a shot.
- Hoist by His Own Petard: Occasionally, Slim will hit himself when a billiard ball he strikes bounces off a wall and hits him. Even so, it is preferable to vacuum the balls and shoot them at him, as this happens rarely.
- Lean and Mean: One of the thinnest ghosts in the mansion.
- Meaningful Name: He is indeed quite slim. A bankshot is also a pool term for hitting the cue ball against the railing before knocking a ball into a pocket, and somewhat of a hint to using the pool balls against him.
- Skippable Boss: Beating him isn't necessary to win the game. The room after him has one of Mario's items, and that's the room you need to deal with. Unless you're playing the 3DS Hidden Mansion, where he has Mario's Shoe instead of Henry and Orville.
Henry and Orville
The Twin Brothers. The fourteenth Portrait Ghost fight.
- Coordinated Clothes: The same outfit with some minor colouration changes.
- Creepy Twins: The pair goes from inviting you to playing hide and seek to trying to kill you with their toys.
- Dual Boss: Luigi has to fight them together, but the performance against Orville determines the ranking; he drops the pearls.
- Named After Somebody Famous: Referencing Henry Ford and Orville Wright. Henry attacks you in a car, and Orville a plane, the two famous vehicles owed largely to those people.
- Skippable Boss: The 3DS Hidden Mansion swaps their chest with Slim Bankshot's, meaning the Twins do not have to be fought. You still have to come into their room for another item, but you can get it without fighting the two.
- Sore Loser: They attack Luigi if he beats them at hide-and-seek, and you need to beat them to proceed with the game; their room has one of Mario's possessions that needs to be taken to Clairvoya so you can get the key to the third floor of the mansion.
- Undead Child: Both of them are dead.
The Freaky Fortune Teller. The fifteenth Portrait Ghost fight.
- Friendly Ghost: She's unfailingly cordial and an outright ally to Luigi, helping him find out more about Mario's plight using the latter's dropped belongings. Once finished with this role, she allows Luigi to vacuum her up with the Poltergust without a fight.
- Fortune Teller: She gives Luigi information on Marios whereabouts if you bring her objects that he owns. Once she runs out of power, she insists you capture her, locking you in her room; she's the easiest Portrait Ghost to capture in the game.
- Large Ham: Tends to get incredibly dramatic and loud at times.
- Punny Name: A pun on clairvoyant. Shes a fortune teller who uses objects to sense where the owners of them are.
- Spooky Séance: Played with. In this case, the medium is the first spirit contacted.
- Token Good Teammate: The only ghost that isnt evil or self-absorbed, she's willing to help Luigi get his brother back and allows herself to be sucked up after she uses up her power, which nets Luigi the key to the Safari Room, the first room on the third floor and the last room before the Area 3 boss.
- Zero-Effort Boss: Almost. She surrenders and has a pull of zero, but it's still possible to get hit with a Poison Mushroom like it is with all the Portrait Ghosts.
Hermit of the Darkness. The seventeenth Portrait Ghost fight.
- Dark Is Evil: The hermit of the darkness only appears once the blackout starts. You have to catch him before you can restore the electricity; the breakers are locked at this point and he's holding the key.
- I'm Not Afraid of You: He spends his time making what he considers to be scary faces...but it's not working, as even Luigi isn't afraid of him. As a matter of fact, this is what exposes him, and he's one of the weakest Portrait Ghosts in the house.
- No Social Skills: He keeps to himself mostly. He doesn't even show until the start of Area 4, and he's in the third room you entered in the game (the Wardrobe).
- Punny Name: Grimmly.
The Clockwork Soldiers
Blue Soldier: Squeak squeak
Green Soldier: The valve... The valve...
The Toy Platoon. The eighteenth Portrait Ghost fight.
- Family-Friendly Firearms: They bear cork gun rifles.
- Fog Feet: The only aversions out of all the portrait ghosts.
- Living Toys: They all march on their own without any winding. How life-size toys became ghosts is left thoroughly unclear.
- Shrinking Violet: The pink one doesnt like being looked at.
- Wind-Up Key: The soldiers have these in their backs, which need to be removed to defeat them.
- Wolfpack Boss: Luigi must fight all three of them at once, though he can suck them up one at a time; it's advised to leave the blue soldier (the one guarding the middle house in the room, which has the elevator to the roof) for last, as he holds the pearls and Luigi's performance against him will determine the painting he receives at the end of the game.
The Dozing Girl. The nineteenth Portrait Ghost fight (also optional).
- Bonus Boss: Unlike the other optional Portrait Ghosts, Sue Pea is the most out-of-the-way Portrait Ghost in the game. Encountering her requires you to access a hidden room late in the game, which contains the key to another optional room before the Guest Room, where she sleeps.
- Creepy Child: Being a ghost has this effect on small girls.
- Deep Sleep: Spends her afterlife in an eternal slumber. Her bio states she died this way.
- Passed in Their Sleep: According to her bio, she died in her sleep from what was supposed to be a quick nap.
- Potty Failure: The way to exposing her heart is to convince her shes done this while sleeping. Her dolls will start floating your way when you play this, however.
- Punny Name: The Japanese onomatopoeia for sleeping is suu-pii. Also a surprisingly appropriate Lucky Translation, as it sounds similar to "soupy" or "Sue pee", which can hint at her weakness.
The Jar Collector. The twentieth Portrait Ghost fight (also optional).
- Chest Monster: He hides in jars and you need to freeze him.
- Flawless Victory: He pops out of the jars seven times, and you have to freeze him all seven times; if you fail, he chuckles and kicks you into the hallway outside his room and the armory you need to clean up; he also forces you out if you refuse to play at all.
- Punny Name: Jarvis.
- Skippable Boss: You don't even need to enter Jarvis's studio to reach the end of the game. The room prior to him does have the key to the rest of the basement, which you do need to acquire.
- Sore Loser: He attacks when Luigi wins his "whack-a-mole" style game, and this is when you can suck him up.
The Chilly Climber. The twenty-first Portrait Ghost fight.
- An Ice Person: Hates warmth so much he resides in the cold storage room where he's frozen in a huge mass of ice. Once angered, he'll start launching waves of ice stalagmites at Luigi and dropping icicles on him. You need to melt him out of the ice to get him.
- Berserk Button: He gets very angry if Luigi ignites the wooden logs adjacent to him.
- Mini-Boss: The last one to appear in the game (Van Gore leans closer to being a Climax Boss, due to him being the creator of the mook ghosts and the only non-Area ghost to guard one of the mansion's elite keys), and one of the most difficult to capture as well (especially if you try to get the golden portrait for it). And it's required to face him as he guards the key leading to the final Portrait Ghost before King Boo (Vincent Van Gore).
- Stalactite Spite: Drops icicles during his fight to try and kill Luigi. This makes him one of three enemies in the mansion that has the potential of giving you 20 hearts of damage (the other two are Biff Atlas in the first floor gym and the final boss of the game).
Vincent Van Gore
The Starving/Unsold Artist. The twenty-second and final non-boss Portrait Ghost fight.
- Art Initiates Life: All the mook ghosts stem from his paintings. His defeat stops them from spawning in dark hallways
- The Dragon: As the source of all the non-Boo ghost Mooks, as well as being the one who guards the key to his room, Van Gore is heavily implied to be this to King Boo.
- Flunky Boss: Would rather send his minions at you than fight himself. Might be because hes a pushover when you get past them.
- French Jerk: He wears sterotypical French clothes and speaks in some French dialogue, and he's not a nice guy.
- Gratuitous French: Despite being based on Vincent Van Gogh, who was Dutch, Van Gore talks with a French accent and sprinkles in French words into his dialogue.
- Mook Maker: All of the non-portrait, non-Boo ghosts in the game are the products of his paintings. Once you remove them from the picture, he becomes one of the easiest Portrait Ghosts in the game to capture.
- Punny Name: Specifically a pun on Vincent Van Gogh.
- This Cannot Be!: Has this reaction when Luigi tells him that with almost all of his artistic creations having all been sucked up, he's only actually created a single lasting piece of art.
- Villainous Breakdown: He freaks out so much from the realization that he has only one remaining piece of art to his name that it makes him vulnerable to being sucked up himself.
Evershade Valley Ghosts
The ghosts that appear in Luigi's Mansion: Dark Moon.
A ghostly dog who just wants someone to play with. Sadly, his antics end up causing trouble for Luigi throughout the game.
Following Dark Moon, he is adopted by Luigi, and acts as his Canine Companion throughout 3.
- Ascended Extra: Goes from a recurring nuisance in Dark Moon, to practically the deuteragonist in 3.
- All There in the Manual: In the FAQ section of 3, Professor E. Gadd says he's researching what breed of dog Polterpup is and suggests that he could possibly be a 'silver retriever'.
- Amplified Animal Aptitude: For an "ordinary" ghost dog who enjoys nothing more than chewing on stuff, playing and receiving attention from Luigi, he shows intelligence on par with a human. Not only does he know his way around different locations instantly and when the plumber is in need of his help, he also understands how Luigi's devices work, where he needs to lead him next by opening the occasional path for him and the solutions for some puzzles and bosses.
- Auto-Revive: It's technically the gold-bone that acts as the auto-revive item, but if you get dropped to 0 HP while holding one, it summons the doggy to bring Luigi back to his senses. So the Polterpup is the one that revives Luigi.
- Because You Were Nice to Me: Most likely the reason why he followed Luigi all the way down from Evershade Valley to his house, so he can live with him. Apparently, not being hostile, giving him at least some attention (even if he ends up in the poltergust afterwards) and showing forgiveness was enough for him to view Luigi as his new master and best friend.
- Big Damn Heroes:
- On B2, he saves Luigi from drowning by acting as a life raft when Clem floods the basement, to which Luigi rewards him with a big hug.
- Performs a Diving Save on Luigi during the finale when King Boo springs a trap that otherwise would've trapped him in a painting. Amusingly, this was actually unintentional, Polterpup just wanted some affection.
- Finally, when the hotel collapses after King Boo is defeated, Polterpup catches Luigi before he hits the ground.
- Big, Friendly Dog: Very affectionate and helpful after Dark Moon, and as of 3, already taller than Luigi when standing on his hind legs.
- Canine Companion: Becomes one after his HeelFace Turn, where Luigi adopts him and brings him home.
- A Dog Named "Dog": Seems to have become this by Luigi's Mansion 3, being called "Polterpup" as a name by Luigi, rather than it being used to mean his species title. In Dark Moon, he was the Polterpup as a description, but it's his name now. Of course, in world with a Yoshi named Yoshi and a Toad named Toad, among others, Polterpup is no stranger to this practice.
- Easily Forgiven: After the grief he gives Luigi three times over, the green plumber is quick to forgive his antics. Granted, the Dark Moon being disabled for the duration of the story was likely the main reason for his mischievousness, and even then, he's just a puppy, so it's hard to stay mad.
- Exposition Fairy: Very briefly in 3 as he is the one to give you the tutorial for the controls of the new Poltergust, since E. Gadd is not around yet. The text boxes could be taken as what Luigi assumes his miming means, as, being a dog, he is a Heroic Mime during the rest of the game, leading you places with barks and body language alone.
- Eyeless Face: Played with. Like the rest of the Evershade Valley ghosts, Polterpup initially lacks eyes due to the Dark Moon being broken (or when he's asleep), but they appear once the moon is reconstructed at the end of the game. Yet in the third game, he's back to this trope with no explanation.
- Female Feline, Male Mutt: The male mutt to Polterkitty's female feline in 3.
- Fluorescent Footprints: Leaves footprints visible by the Dark-Light Device, and marks where he jumped through walls or doors. This is used to track him down during Dark Moon and can be used to see where he's been in 3.
- Happily Adopted: At the end of the second game, Luigi takes Polterpup home with him as a pet. By the third, he's going along on vacations with the rest of the gang, and gets to share a bed with Luigi.
- Heroic Mime: Being a dog, he doesn't speak beyond cheerful barks. He sill guides Luigi around the hotel during multiple sections of the third game, using body language and the occasional tackle to get his point across.
- Hint System: In 3, should you be stuck on a particular boss fight or puzzle for too long, Polterpup may appear and nudge you in the right direction.
- Non-Human Sidekick: He returns in Luigi's Mansion 3 as a non-playable ally to Luigi and is notably the one ghost that Luigi isn't terrified of, though that's not to say he doesn't pop up and startle Luigi a good number of times.
- Obliviously Evil: Unlike the other Evershade Valley ghosts, the loss of the Dark Moon hasn't made him hostile, but it's implied he's such a nuisance due to its effects, seeing as he seems remorseful after the Moon is restored.
- Ridiculously Cute Critter: Especially in 3, which really plays up his cuteness by having Luigi give him tummy rubs and pets at various points in the story.
- Skewed Priorities: Your master and his friends are about to be trapped in a painting by King Boo? This is clearly the right time to chase a bat! Granted, he does save Luigi since he happened to be in his way, but still.
- Spanner in the Works: In 3, Luigi barely escapes King Boo, who attacked him while he doesn't have the Poltergust. It's Polterpup who helps Luigi find the device that will allow him to fight back.
- Before the final boss fight in Luigis Mansion 3, King Boo attempts to trap Luigi in a painting alongside Mario and Peach. Luigi is only saved thanks to Polterpup tackling him out of the way at the last second.
- Stomach of Holding: In Luigi's Mansion: Dark Moon, he can eat crucial objects like keys despite some of them being larger than him and keep them in his tummy with no issues. Luigi needs to chase after him and vacuum him up to retrieve them.
- Team Pet: In Luigi's Mansion 3, it seems to have become one for the Mario Bros clan (though its interactions with them are still largely limited to only Luigi), being allowed to accompany them on their vacation and even serves as Luigi's Non-Human Sidekick during the adventure. Mario scolds him during the opening scenes when he steals some cake the red plumber was about to chow down on.
- The Goomba: The most commonly enountered enemies in the game.
- Green and Mean: Green is in the name, and Greenies are the most common enemy.
- Improbable Weapon User: The weapons they use consist of rolling pins, watermelons, hockey sticks...
- Luckily, My Shield Will Protect Me: Greenies may sometimes have glasses or pans that protect them from being stunned by Luigi's flashlight. You'll have to vacuum them to get rid of them.
- Meaningful Name: They're called Greenies because...they're green.
- Metal Slime: They have a golden version that's rare and fast, but once you catch it, you receive a ton of money.
- Weak, but Skilled: They only have 10 HP, but a number of Greenies will have found ways to protect themselves from Luigi's flashlight.
- Dirty Coward: They like to hide inside furniture and throw objects while Luigi's fighting other ghosts; finding them causes them to freak out and flee to another spot.
- Fragile Speedster: Hiders are fast and quick, but only have 15 HP.
- Lean and Mean: They're thin and menacing (when under King Boo's mind control, that is).
- Combat Pragmatist: Sneakers can go behind Luigi and push him over, and can pop out at unexpected locations.
- Jump Scare: They serve this purpose in-universe, sneaking up behind Luigi and startling him enough to break his pull during a ghost capture.
- Space Master: The ScareScraper-only "Terrible Teleporter" bosses, who are similar, can spawn portals to warp you elsewhere.
- Big Eater: As their name implies, they're often gorging on food.
- Collision Damage: Be careful not to get too close to them; they'll simply knock you away with their huge stomachs.
- Fat Bastard: They're basically spherical, and are so large that they have to jump around to move. When not under King Boo's control, they're much nicer.
- Giant Mook: They're bigger than any of the other ghosts and have 100 HP.
- Ground Pound: They only do this in the Scarescraper mode, surprisingly enough.
- Idle Animation: If not attacked for a few seconds, they may pull out a random item & eat it, which may be followed by them farting. This actually makes them easier to attack.
- Mook Maker: Their boss version in Scarescraper, called the Creeper Launcher, can spit out purple goo, which form into small Creeper ghosts.
- Shmuck Bait: They will spit goo at you while you're vacuuming them. You would think that by jumping, you would avoid getting hit. But jumping causes Luigi to get pulled towards them, and Gobbers knock you away when you get too close.
- Stationary Boss: They don't move around very much, and tend to stay in one place.
- Stone Wall: Gobbers hardly ever move, and their attacks aren't very strong. However, they have 100 HP, their goo can cause Luigi to slip into other hazards, and their only melee attack pushes him away.
- Super Spit: Gobbers' main method of attack is spitting goo at Luigi. It damages you if it falls on top of him, or it can fall on the floor, which you can slip on.
- Asteroids Monster: If you step in one and break out, the large Creeper splits into two smaller, weaker ones (though these have the ability to pursue you).
- Cuddle Bug: Their Vault bio describes them under the Dark Moon's effects as this.
- No-Sell: They have infinite HP, so the regular Poltergust methods won't work. Instead, they need a charged pull to rip their gooey pseudopods off the floor.
- Perpetual Smiler: They always have a goofy grin on their faces.
- Personal Space Invader: If you try walking over them while they're in their "puddle form", they will imprison Luigi in their bodies.
- Mind over Matter: They're able to lift books and other objects with the powers of telekinesis.
- Mini-Boss: They're fought at key points over the course of the game and, outside of the main bosses, are the most difficult to defeat strategy-wise. In Luigi's Mansion Arcade, one of them serves as the Boss Ghost of the first area - and is the only Poltergeist you face in that game.
- My Brain Is Big: They have disproportionately large heads, but the brains visible inside them don't really fill up the space.
The Three SistersFormer residents/owners of the Haunted Towers, fought in its graveyard. They consist of Sisters Herlinda, Belinda, and Lucinda. While Lucinda is the youngest, her older sisters can't agree on who is the eldest.
- Berserk Button: Do not try to stun a Sister who is still looking into her mirror. You will be attacked by her siblings.
- Big, Thin, Short Trio: Sister Herlinda is the big one, Sister Belinda is the thin one, and Sister Lucinda is the short one.
- Blush Sticker: Sister Lucinda has these.
- Improbable Weapon User: They all use large hand mirrors to batter poor Luigi with fighting similarly to Greenies wielding shovels.
- Mini-Boss: They replace the Poltergeists in this role during Luigi's stay in the Haunted Towers. Defeating them is required to proceed in the mission of escorting the rescued Toad to E. Gadd's headquarters in the mansion's third chapter. They are upgraded to the Boss Ghosts of the second area of Luigi's Mansion Arcade.
- Vanity Is Feminine: The only explicitly female ghosts in the game, and they gaze into mirrors. Oddly, this actually protects them from being stunned— it's only when they look away from themselves that they become vulnerable.
PossessorsA group of five ghosts capable of possessing another object or being and controlling them. They guard five of the Dark Moon shards and are major bosses in Luigi's Mansion: Dark Moon.
- Adapted Out: Completely absent from the arcade adaptation of Dark Moon despite originally being the ones personally guarding the Dark Moon shards.
- Body Horror: When you try to suck them up, they'll shed their "skin" mouth-first to escape, but can only do it two times.
- Bullfight Boss: When forced to fight on their own, their only means of offense is a charging attack that renders them vulnerable though they each have their own spin on it.
- Demonic Possession: They fight like this, possessing things in order to fight against Luigi.
- Underground Monkey: Though varying in tactics, they're all physically identical to one another save for the number of horns on their heads.
Mansion: Gloomy ManorThe one-horned Possessor that takes control of a massive spider in the basement, having its children spread webs all around the Manor.
Mansion: Haunted TowersThe two-horned Possessor that lurks in the tree house of the Tower, which is sealed away by a pinwheel gate and great wood door. It fights by possessing a staircase.
Mansion: Old ClockworksThe three-horned Possessor that hides within the Clockworks's clock tower, hidden behind a clockwork gate. It fights by controlling a clock and sending groups of enemies at you while spinning its hands as a hazard.
- Flunky Boss: Most of the fight is spent battling various enemies for 12 waves, one for each number on the clock. After every fourth wave, the possessor will fight you itself while still manipulating the clock hands to function as a hazard.
- Time-Limit Boss: Every wave of enemies has to be defeated before the minute hand makes a full clockwise rotation or else the wave will reset. The minute hand can be turned back using the vacuum to pull the minute hand counterclockwise.
Mansion: Secret MineThe four-horned Possessor that lurks in the in the Secret Mine's Workshop where he is first seen trying to harass a Fuzzball by throwing bombs at it. When Luigi manages to reach it, it possesses the frozen ground to become an ice monster in an attempt to escape with the Dark Moon piece, causing Luigi to chase it down the pit.
Tough PossessorThe five-horned Possessor and last guardian of the Dark Moon shards. It lurks within the Paranormal Dimension that can only be accessed by using the portal within the Treacherous Mansion. It fights by splitting itself up and possessing multiple suits of armor at once, before taking possession of a massive suit.
- Animated Armor: Possesses multiple suits of armor with various weapons. In the last phase it possesses one giant suit of armor.
- Me's a Crowd: Splits itself up to possess multiple suits of armor at once before possessing one giant suit of armor.
- Shock and Awe: Outside of the suits of armor, his charging attack sends out trails of electricity.
Last Resort GhostsThe ghosts that appear in Luigi's Mansion 3.
- Friendly Ghost: After King Boo's gemstone is destroyed following the collapse of the Last Resort, the ghosts stop being hostile to Luigi and co. They even agree to E. Gadd's offer to build a new hotel for them so they have a place to live.
- Oh, Crap!: While they have this when getting sucked up, a bigger case of this is the ending, when their home, the Last Resort Hotel, is destroyed, before being saddened at their apparent homelessness.
- Took a Level in Jerkass: For the Mooks of the series in general. The ghosts in the first game were living art created by Vincent Van Gore, and aside from their ever-present smiles didn't emote too much, while the ghosts of Evershade Valley were driven mad from King Boo's interference in Dark Moon. These ghosts, however, constantly show that they delight in trying to scare, harm, and bully poor Luigi, and they're all in their right mind the whole time. They do pull a HeelFace Turn at the end, once King Boo's crown disappears, as King Boo was using it to make them hostile.
GoobsBlue, Casper-like ghosts that haunt the many floors of The Last Resort.
- Elite Mook: Come in a number of more tricky variants, having glasses, shields, or hats that need to be removed before they can be sucked up. Some have to be vacuumed off, while others require multiple suction shots to knock off their headgear or a burst and quick timing with the flashlight while their headgear is blasted above their head.
- The Goomba: The most basic variety of ghost.
- Metal Slime: The Gem and Golden Goobs drop a ton of money if you can manage to suck them up. Gem Goobs will only drop the gems they guard, but they are treasure. They both also have different types of exceptional durability. Golden Goobs have 250 health (as much as the first half dozen bosses of the game), while Gem Goobs don't lose health just by being tethered and have to be slammed to hurt them.
- Suspiciously Similar Substitute: To Greenies from Dark Moon. The Gem and Golden versions even had the same panicked "swimming for dear life" animation that Gold Greenies did.
HammersRed, large, squared, and brutish, these ghosts are first found in the Hotel Shops floor.
- Dumb Muscle: As is to be expected.
- Smash Mook: Their tactics consist of smashing and/or charging at Luigi.
- Shockwave Stomp: They often slam themselves into the ground, creating small shockwaves.
- Suspiciously Similar Substitute: Of Slammers from Dark Moon. Not only do their names sound similar, they look and sound nearly identical, only being more squarish with two tails. However, they differ in that they have exceptionally high health (250 as opposed to Slammers' 30), and their two tails allow Luigi and Gooigi to team up on them.
Yellow, thin ghosts that love to hide and throw things. These ghosts are first found in the Mezzanine floor.
- Lean and Mean: They're very skinny ghosts and make things difficult for Luigi.
- Suspiciously Similar Substitute: To Hiders from Dark Moon. They're both long and thin, and both hide and throw stuff at Luigi. They're both primarily drawn out by finding the thing they're hiding with and interacting with it, too. The only real difference is the amount of health they have - 100 for Oozers and a mere 15 for Hiders. Their habit of leaving tripping hazards is similar to Dark Moon's Gobbers as well, and more specifically similar to the first game's Garbage Can Ghosts, as their hazards are banana peels.
Purple, lanky creeps that love to stay invisible and attack from behind. These ghosts are first found in the Garden Suites floor.
- Suspiciously Similar Substitute: To Sneakers from Dark Moon. They look similar and have an identical method of catching Luigi by surprise. They can also grab Luigi and hold on like the Grabbing Ghosts in the first game.
Massive orange ghosts with two tongues that try to catch unfortunate people who cross their paths. They can only be beaten by using both Luigi and Gooigi.
- Spare Body Parts: Has two tongues.
- Suspiciously Similar Substitute: Trappers have similarities to Creepers, being anchored ghosts that can catch Luigi and requiring a strong attack to defeat them because they have no HP. Their general undetectability is also reminiscent of Ceiling Surprises or Purple Bombers from the first game, whom Creepers are derived from.
- Amazing Technicolor Population: They come in a variety of "skintones", which is justified by them being ghosts.
- Ambiguously Evil: Hellen aside, it's unknown if they are actual villains, innocent ghosts under King Boo's influence or just employees following Hellen's orders.
- Ambiguous Situation: Unlike with the Portrait Ghosts of the first game, it's unclear whether the boss ghosts were once living humans or if they're the kind of ghosts who were always ghosts.
- Arc Villain: Each one acts as the main adversary of their floor. Some of them (such as Dr. Potter, Clem, and the magician sisters) have a constant presence throughout the floor, causing trouble at various points up until their boss fight.
- Speaking Simlish: They all make sounds that sometimes can be vaguely interpretated as words (like Hellen calling for Luigi or the magician triplets' magic words), but are otherwise mostly nonsense. This applies to even the ones that DO have text dialogue (Hellen, Steward and Morty).
- What Happened to the Mouse?: Except for Hellen and Polterkitty, none of them appear in the game's ending.
Floor: Master Suites
- Beehive Hairdo: How she styles her hair. It falls down and becomes messy when angered.
- Big Bad Duumvirate: The purpose of her Evil Plan might be solely to earn King Boo's approval, but in the end, the hotel and its staff are still hers to command while King Boo watches from the sidelines for most of the game.
- Big Bad Wannabe: Everything she does is just to please King Boo, who is far more dangerous and has bigger plans.
- Cleavage Window: Surprisingly, since it's in a Mario game. It's subtle, but it's there. Between that and her name, she's probably the most E10+ character in the metaseries.
- Cosmetic Horror: Hellen is actually not so pretty and graceful without her makeup.
- Fangirl: Hellen is a HUGE King Boo admirer, being primarily motivated by his opinion on her. Everything in her personal quarters is designed after his image, from paintings to furniture.
- Ghostly Glide: Hellen wears a floor-length dress and glides smoothly around the hotel.
- Graceful Loser: Surprisingly, Hellen herself is this when Luigi manages to finally defeat her; as soon as she stops resisting, she takes a moment to freshen up her hair and makeup right before she's sucked into the Poltergust G-00.
- Improbable Weapon User: She attacks and defends herself with a hand mirror. A bit unimpressive by itself, but combined with her security system, it works well enough.
- It's All About Me: Even though she places herself below King Boo and has no intention to betray or use him, Hellen is demonstrably quite vain herself, with expensive attire, frequent makeup application, and decorations in her floor-sized suite that depict her ruling as a pharaoh alongside King Boo (possibly explaining why the Tomb Suites are in the hotel as well—she might see Egypt as an ideal of wealth and power).
- Know When to Fold 'Em: When Luigi finally defeats her, she knows she can't stop Luigi any longer and takes a moment to freshen up her hair and makeup right before she's sucked into the Poltergust G-00.
- Laser Hallway: Her Master Suite is filled with lethal security lasers and her Boss Room is no exception. Most of her boss fight involves either dodging lasers or deactivating laser barriers to make it easier to vacuum her up.
- Loony Fan: While already a huge Fangirl of King Boo, it reaches disturbing heights once Luigi gets to the Master Suite. The entire floor is basically a Stalker Shrine to King Boo, filled with paintings of her and the King together and shelves upon shelves of trophies in the King's likeness. Even the gems for the floor are shaped like him.
- Mad Love: Hellen is deeply infatuated with King Boo and does everything to impress him. King Boo clearly doesn't care about her efforts, valuing only the immediate results of her plan.
- Names to Run Away from Really Fast: Luigi probably should've hightailed out of the building the moment Hellen Gravely introduced herself.
- Purple Is Powerful: She's purple and the boss of the Hotel's ghosts, who she refers as her staff. At 600 HP, she currently has more HP than any other boss in the entire series.
- Puzzle Boss: Her primary weapon is not her hand mirror or ghostly powers... it's her high-tech security system, turning the boss fight into more of a management challenge as you try to maneuver Gooigi around the workings to shut off all the laser barriers while keeping Luigi out of harm's way.
- Rage Against the Reflection: The vanity in her bedroom has a broken mirror, and it's strongly implied by her frequent makeup use and true appearance that she lashed out at the mirror in anger at her appearance.
- Red Eyes, Take Warning: Her real face sports these.
- Rich Bitch: She owns a luxury hotel, dresses in fine clothing, lives in the swankiest suite on top of the hotel, and is a very angry woman who lured Luigi and co. to her hotel with the intent to give them over to King Boo so he would give her recognition.
- Sinister Shades: Wears a pair during her introduction. The obvious intent is to hide her ghostly eyes.
- Spell My Name with an "S": "Helen" is normally only spelled with one L. See above in Names to Run Away from Really Fast.
- Villainous Breakdown: Happens to her slowly, as Luigi rescues more people and King Boo becomes increasingly displeased with her (in)competence. It all pays off when she finally comes face to face with Luigi on the final floor.
- Your Makeup Is Running: Hellen frequently reapplies makeup, especially when her literal ugly side is showing.
- Cowardly Lion: Is constantly nervous and is very clearly frightened during the fight but stands his ground. When he runs low on suitcases he'll even hide behind the concrete pillar in the background for a moment.
- Everyone Calls Him "Barkeep": He's only known as "Steward", which likely refers to his profession instead of an actual name.
- Glass Cannon: He's among one of the easiest boss ghosts encountered and his attack pattern is easy to figure out and avoid, but getting hit by one of those hefty suitcases he chucks at you will take off nearly half your health. Of course, getting hit by a fully-loaded suitcase, even one being thrown by a ghost as weak as him, is going to hurt.
- Hammerspace: The luggage he tosses respawns off screen so that he doesn't run out of things to fight with. That being said he can still run low on them and will hide when it happens.
- Improvised Weapon: The only reason he hurls luggage at Luigi is because he didn't really have much else around. That said, they deal a great deal of damage and even protect him from Luigi's Strobulb flashes. Too bad he tires himself out every time he tosses one.
- Warm-Up Boss: Steward has the most basic battle tactic of any Boss Ghost. He attacks, you dodge, he takes a short break, you flash his light on him. He's even easier and faster if you realize you can Burst the luggage out of his hands.
Floor: RIP Suites
A maid/housekeeper ghost who is fought in the RIP Suites fifth floor. She takes an interest on E. Gadd's briefcase and attempts to escape from Luigi after swallowing it up.
- Beehive Hairdo: Sports one.
- Cowardly Boss: If Luigi damages her enough, she will just retreat to another suite.
- Creepy Housekeeper: By virtue of being a ghost.
- Discard and Draw: With E. Gadd's briefcase in her stomach, she becomes immune to the Poltergust's suction, but this also makes her vulnerable to the Suction Shot (and, subsequently, the Slam) since the briefcase is wide enough to provide a surface for Luigi to shoot plungers at.
- Early-Bird Cameo: You can catch a glimpse of her in the Mezzanine when Luigi is entering the hotel.
- Let's Get Dangerous!: After getting repeatedly slammed twice, she switches from panicking to trying to engage Luigi in a fight.
- Meaningful Name: Her name is based on the French word for "room", chambre, or the more antiquated term "chambermaid".
- Ninja Maid: Downplayed. She's not that much of a fighter since her one attack is a weak tackle, but must be pursued across half of the floor during her fight.
- Stomach of Holding: She can keep a solid object within her body by just swallowing it. The only disadvantage is that it makes phasing through walls harder, although that's still possible somehow.
Floor: Hotel Shops
A fat security guard/mall cop ghost who is fought in the Hotel Shops third floor. He loses a key that allows Luigi to explore his floor, and then battles Gooigi with a water pistol he happened to have confiscated in his office.
- Acrofatic: Basically the opposite of this. It's clear that he can't really pull off those cool-looking Unnecessary Combat Rolls gracefully due to his girth getting in the way.
- Cowardly Lion: He's probably as much of a scaredy-cat as Luigi is, but becomes more confident with the right tools.
- Donut Mess with a Cop: Referenced. He's overweight and named after the cruller, a type of donut pastry. Kruller himself is just a security guard, but his actions and body language do seem to suggest that he likes to pretend he's something more.
- Harmless Villain: Due to the way his battle is set up, he has no way of defeating or even damaging Luigi. The most he can do is delay his progress in defeating him by hitting Gooigi with water.
- Laughably Evil: A stand-out example in a game filled with rather goofy foes. He's cowardly, bumbling and is constantly trying to act like he's in some sort of 70's cop movie, performing clumsy combat rolls throughout the fight.
- Large Ham: Think Paul Blart, but as a ghost.
- Sinister Shades: Wears a pair of aviator sunglasses that provide him protection from the Strobulb, so those have to be removed first before you can flash him. He will lose them permanently after being weakened enough, using a pair of star-shaped shades first, and then Groucho glasses as a permanent replacement once those are broken.
- Water Guns and Balloons: His Weapon of Choice is a water pistol he happens to find in a nearby cardboard box. It would be rather useless against Luigi, but since only Gooigi (who melts upon contact with water) can access the combat zone, it ends up being an effective weapon.
- Zero-Effort Boss: It is impossible to be killed by him since only Gooigi can face him. Even if Gooigi is hit with a water blast, he can just respawn endlessly and walk back into the fight while Luigi is safe to watch from a distance.
A messy French chef ghost who is fought in the Mezzanine second floor kitchen, after Luigi accidentally makes him drop the food he was cooking.
- Berserk Button: You don't want to mess with his cooking.
- Chef of Iron: He shows Luigi the business end of his frying pan for making him drop the fish he was cooking.
- French Cuisine Is Haughty: His name is based on a French dish and he makes stereotypical "hohn hohn" sounds, and is a chef with a very poor temper.
- Frying Pan of Doom: His main weapon. Also serves as his method of defense against Luigi's flashlight.
- Hoist by His Own Petard: If you run out of melons in the kitchen, the fish he uses as projectiles against Luigi can in turn be used as projectiles against him, stunning him and giving Luigi an opening.
- Lost Food Grievance: The fight begins because Luigi accidentally made him drop the fish he was cooking.
- Punny Name: Note the "soul" slipped into it.
- Shamu Fu: If the frying pan attack doesn't work, he can toss fish at Luigi too.
- Twitchy Eye: He does one after dropping his fish, and subsequently attacks Luigi to start the fight.
Floor: Great Stage
A pianist ghost who is fought in the Great Stage fourth floor by possessing a grand piano. The first ghost that guards a painting as well (in this case, Red Toad).
- Chairman of the Brawl: Spends the first phase of his battle magically throwing the audience chairs at Luigi.
- Creepily Long Arms: When outside his piano, he's able to extend his arms to attack Luigi.
- Flunky Boss: The second phase of his fight involves tutu-wearing Goobs entering the stage and attacking Luigi with ballet moves.
- Graceful Loser: Once Amadeus realizes he's been defeated, he takes a bow before he gets sucked into the Poltergust.
- Instrument of Murder: He becomes one by possessing his piano and attacking through it.
- Madness Makeover: Once sufficiently angered, his neat, straight hair unravels into a mess and he makes some deranged facial expressions during his last phase.
- Musical Assassin: His music can make chairs levitate and summon enemies and he actually gets to attack with flaming music notes at some points.
- No Historical Figures Were Harmed: His name is a rather obvious play on Wolfgang Amadeus Mozart, while his demeanor is more like a pastiche of Ludwig van Beethoven.
- Piano Drop: Attempts to pull this on Luigi throughout the third phase of his boss fight.
- Recurring Element: The 3rd pianist ghost boss fight in the series after the library Poltergeists in Dark Moon and Melody Pianissima in the first game.
- Shockwave Stomp: His piano monster phase will perform this after a series of regular ground stomps, and Luigi must use the Burst move to jump over it.
- Shows Damage: Not Amadeus himself, but his piano; it gradually gets more and more beaten up the further along the third phase of the fight goes, right up until the third smash, which completely destroys the piano.
- Tactical Suicide Boss: Provides Luigi with a generous amount of bombs that can be launched back into his piano, including ones with delayed fuses that give him time to make a shot.
- Villainous Breakdown: Introduced as calm, serene and confident, only showing mild annoyance at Luigi's presence and smirking when he scares him off the stage with his aggressive piano playing. Once Luigi captures his ballet-dancing ghosts, he completely loses his temper and spends most of the third phase in an Unstoppable Rage.
- Wake-Up Call Boss: Wolfgeist presents the first REAL fight of the game since no ghost before him has a complex attack pattern or multiple phases like he does.
- Unique Enemy: The ballet-dancing Goobs are exclusive to his fight, and in fact can't be found anywhere else outside of it and the occasional revisit to his stage.
Floor: Castle MacFrights
A medieval Scottish king ghost fought in the Castle MacFrights sixth floor. He challenges Luigi to a duel for the seventh floor elevator button.
- Annoying Arrows: By raising his lance up to the air to make the tip shine, he can signal to some of his goons to unveil some launchers hidden in the arena wall, which will soon shoot these at Luigi.
- Animated Armor: Possesses a suit of armor for his fight against Luigi. It must be destroyed before he can be captured.
- Authority in Name Only: Implied with how his castle is just a floor in a hotel and the audience during his boss fight consists of a bunch of cardboard cutouts with pre-recorded applause and booing.
- Bullfight Boss: He charges at you in a joust while wearing the armor, and must be stunned and slammed around.
- Clipped-Wing Angel: Once his armor is destroyed, he equips a sword...which, given the pitiful Spin Attack he uses like this, is VERY clearly not a weapon he's good with.
- Dash Attack: He mainly rides around the arena in a circle on his armored horse, bowling over Luigi if he happens to be in the way. On occasion though, he will stop to try and rush at the plumber with his lance. This presents an opportunity to counter his rush with a flash to stun him.
- Egopolis: His floor has many, many, many statues and busts built on his image.
- I Shall Taunt You: The moment he meets Luigi, the first thing he does is wave his button around, as if to say to Luigi "You want it? Come and get it!"
- Jousting Lance: The king's preferred weapon of choice.
- Lean and Mean: Surprisingly, he subverts Adipose Rex.
- Luckily, My Shield Will Protect Me: He can only be stunned when he peeks over his shield during the first phase, or when he drops it during the second.
- Violent Glaswegian: Or, well, whatever the equivalent of Scotland in the Mushroom Kingdom is, but he's definitely got the violent part down when he takes on Luigi in a duel for the button.
Floor: Garden Suites
An old botanist ghost fought in the Garden Suites seventh floor. One of his plants ends up eating the eighth elevator button, so he makes it grow gigantic to keep it away from Luigi's reach.
- Defiant to the End: What does he do before getting fully captured? Throws his elevator button onto an unreachable leaf as a final "screw you" to Luigi. Fortunately, he drops his watering can and you can grow a ladder up to the button.
- Evil Old Folks: He's noticeably older than the other Boss Ghosts, but he's no less of a threat.
- Green Thumb: Whatever's in that watering can he carries around lets him do this.
- Jerkass: He messes with Luigi a lot more than most of the other boss ghosts do.
- Man-Eating Plant: Uses one to fight, and will grow a new one for each round, replacing the ones you cut down.
- Morally Ambiguous Doctorate: He's definitely not your ordinary botanist, what with the giant pineapples and killer carnivorous plants.
- Punny Name: Dr. Potter. He's a botanist. Get it?
Floor: Paranormal Productions
- Finger Framing: He does this when realizing Luigi is the person he needs for his film.
- Friendly Ghost: He's the only ghost who doesn't antagonize Luigi, and in fact pays him some rather flattering comments after the plumber brings back his megaphone.
- Gag Nose: His admittedly large nose is the basis of his Japanese/Korean name, "Joe Nose".
- Notzilla: A Goob is dressed as one of these in his film, and acts as the "proper" boss fight instead of Morty.
- Token Good Teammate: Again, the only Boss Ghost that's not hostile to Luigi, and doesn't actually fight him.
- The Unfought: Downplayed. Despite being classified as a Boss Ghost, you never get to fight him directly, although he does provide a Boss Battle anyway by having Luigi confront a Notzilla so the player doesn't feel cheated out. If you try to capture him later, he will offer no resistance besides clinging to a table.
- Writer's Block: Suffering from this when Luigi meets him. The goal of the floor is to help him shake it off, and eventually, help him complete his film.
- Yank the Dog's Chain: After the Kaiju fight, Morty will be busy in the editing room giving his film the finishing touches. If you decide to capture him before he finishes, the film never gets completed. You can downplay this trope after facing Polterkitty, though.
- Zero-Effort Boss: If you decide to capture him, he has so little health (just 25 HP, exactly 1/4 of what a basic Mook has) that he doesn't have time to put up any significant resistance. In fact, Luigi will probably capture him before he can slam Morty even once.
Floor: Unnatural History Museum
A caveman ghost fought in the Unnatural History Museum ninth floor, where he possesses a T-Rex skeleton. The second ghost to guard a painting (in this case, Blue Toad).
- Attack Its Weak Point: His first and second phases involve hitting the glowing orb (implied to be Ug himself) in the T-Rex's ribcage.
- Attack the Mouth: In order to get at the above-mentioned weak spot, Luigi must vacuum up a fossilized egg dropped from one of two overhanging Pterodactyl exhibits, then launch it into the skeleton's mouth when Ug makes it open up to roar (or simply have Gooigi wander in front of him to trigger a bite attack). Doing so will make him briefly struggle with whatever he has in his mouth and allow Luigi to blast him with the spare egg.
- Background Boss: Until he breaks free of the pole, that is.
- Bad with the Bone: His third phase involves him swinging around a T-Rex bone like a club. He also uses it to block Luigi's Strobulb flashes.
- Boss Arena Idiocy: Possessing something as large as a T-Rex skeleton to finish off Luigi is actually pretty intelligent on Ug's part... it just so happens to be in a place littered with other exhibits that provide a lot of spare ammo once destroyed. Though Ug does wise up in the first phase by smashing apart one of the Pterodactyls to leave Luigi without a spare egg to blast him with, he doesn't account for Gooigi being just as effective a distraction.
- Clipped-Wing Angel: While not a pushover, Ug himself has a considerably simpler attack pattern and weakness than the T-Rex skeleton he was possessing.
- Dem Bones: The first two stages of his fight has him possessing a Tyrannosaurus skeleton, and you need to bust up its rib cage to defeat it.
- Just Eat Him: He eats Blue Toad's painting as the T-Rex skeleton right before the fight.
- Make Me Wanna Shout: In T-Rex form, Ug can unleash sound waves when he focuses some of his roars in order to attack Luigi from a distance.
- Shockwave Stomp: Slams the ground with his bone club using both hands. It's dangerous but it leaves him vulnerable if Luigi avoids it using his Burst move.
- Tyrannosaurus rex: Spends most of the fight possessing the bones of one. You don't even see what Ug himself looks like until the last phase.
A lazy mechanic ghost who is fought at the Boilerworks, in the second Basement floor. He floods the place up to mess with Luigi and halt his progress.
- Bald of Evil: Flashing a light on him will reveal that he hides a bald spot under his cap.
- Corrupt Hick: The guy's a redneck, sure, and a really mean one at that.
- Crouching Moron, Hidden Badass: While Clem is a pretty lazy and dumb ghost, his boss fight can be tricky if you don't know what you're doing.
- Deep South: He has a stereotypical hillbilly look and name, with his level and scenes being accompanied by banjo music.
- Hoist by His Own Petard: It's possible to use his mines against him by letting them blow while he's sufficiently close to the blast radius. This is a bit cumbersome though, so you're better off just letting him miss his own melee attacks as that leads to the same outcome anyway. Occasionally, while he's spinning around while stunned, he might get too close to one and prolong the stun period.
- Jerkass: He's one of the Boss Ghosts that likes messing with Luigi the most.
- Paper Fan of Doom: Aside from his mines, he mostly fights using a large paper fan that effectively blocks Luigi's Strobulb flashes.
- The Pig Pen: Clem's room in the Boilerworks is filled with junk, and it takes almost a full minute to fully vacuum the stream of detritus under his bed.
- Really Fond of Sleeping: Luigi walks in on him taking a nap twice. Heck, he does it in his battle if he gets bored enough, and naps in a pool floatie in his containment jar in the Gallery.
- Sea Mine: Spikey mines litter the waterways of B2 and he'll even toss them out during his boss fight. There are some on the sides of his arena as well.
Floor: Tomb Suites
A pharaoh ghost who haunts the Tomb Suites tenth floor. After waking up from her sarcophagus, she manages to make Luigi fall through a trapdoor that sends him into a gauntlet of deadly puzzle rooms.
- Animal Motifs: Everything about her references snakes in some way, be it her design, movements, floor, powers and even name.
- Giant Hands of Doom: Forms giant sandy hands to punch or smash Luigi.
- Graceful Loser: Upon running out of health, she just folds her arms as if she's going back into her sarcophagus.
- Nepharious Pharaoh: Sends Luigi to die in a sand pit at the bottom of her pyramid.
- Sand Blaster: Her primary method of fighting.
- Regenerating Shield, Static Health: She can continuously regenerate a sand mound to protect herself, even multiple times in one phase, but like every ghost, her health never comes back.
- Seductive Mummy: Close enough to a mummy to count. She blows a sandy kiss at Luigi, but solely to unnerve him before their fight.
- Shielded Core Boss: Hides inside a large moving sand mound in the likeness of her head, forcing Luigi to get up close and suck the sand away to reveal her.
- Shockwave Stomp: Her sand mound can leap into the air to perform one of these.
- Walk Like an Egyptian: This is how she attempts to escape from Luigi when being sucked in.
Nikki, Lindsey & Ginny
Floor: Twisted Suites
Mischievous, young magician ghost triplets who are fought in the Twisted Suites eleventh floor. They like to bully Luigi with their magic tricks as he progresses through their territory.
- Coordinated Clothes: The three of them all wear the same magician outfit. You can only tell who's who through their hairstyles.
- Cute Ghost Girl: They appear to be the youngest of the Boss Ghosts.
- Death Dealer: They launch giant playing cards as projectiles in their battle.
- Expy: Being a group of multiple young ghosts and a trio, they're reminiscent of Henry and Orville from the first game and the Three Sisters from the second.
- Meaningful Name: Their initials reference the game's developers, Next Level Games. Their Italian names are all references to magic - Magia ("magic"), Amalia (from "ammaliare", "spellbinding") & Divina ("divine").
- Nice Hat: They all wear large silk top hats fitting for a trio of stage magicians.
- No Name Given: A bizarre case. Their names are given, but it's never made explicit which girl has which name.
- Shell Game: They love moving around while inside their gigantic silk hats, so they can employ this naturally in their boss fight. After one of them gets captured, the remaining one(s) will replace the missing triplet(s) with a bomb, forcing the player to pay attention in order to avoid the trap next time. This becomes more difficult when there's only one sister left as the lights will start flickering once the hats start spinning around, requiring the player to account for the hats' motion during the brief blackout to keep tracking the correct one.
- Squishy Wizard: Each of the sisters has just 100 HP, enabling Luigi to vacuum/slam each of them down to 0 in a single go.
- Stage Magician: Their whole shtick.
- Trickster Twins: Triplets, rather. They don't really pose a danger to Luigi until their actual battle, preferring to annoy him with their magic instead. They're not harmless though, since poor Luigi still gets hurt by their antics.
- Wolfpack Boss: You fight all three of them together, although you can only attack and capture them one at a time.
Floor: The Spectral Catch
A shark pirate ghost fought in the The Spectral Catch twelfth floor, after possessing his own pirate ship. The third ghost to guard a painting (in this case, Yellow Toad).
- 13 Is Unlucky: He wears the 13th floor button in place of his missing eye.
- Buried Treasure: Once you defeat Fishook, youll be able to go the bridge of his ship. On a barrel is a map which leads to a buried treasure chest with a gem.
- Eyepatch of Power: Wears one above his aforementioned elevator button eye.
- Feed It a Bomb: That's how you get him to stop possessing the ship.
- Hook Hand: His right fin is one of these. It's also his main weapon.
- Ninja Pirate Zombie Robot: Ghost pirate shark!
- One-Winged Angel: After losing enough health, he goes from possessing the floor of his ship to possessing the entire ship.
- Shark Fin of Doom: The introductory cutscene before his fight has him approaching the pirate ship with just his fin above the water.
- Tactical Suicide Boss: Fishooks idea of possessing the ship is rather good- unfortunately, his decision to have some Oozers toss exploding barrels at Luigi ruins his entire plan.
- Tailfin Walking: Downplayed. At one point, Fishhook stands up on his tailfin, but otherwise moves around by floating like any ghost.
- Token Non-Human: The only non-human Boss Ghost (if you don't count Polterkitty), much like Spooky in the first game.
- Threatening Shark: A menacing character from the get-go, with little silliness surrounding him.
- Treasure Chest Cavity: As mentioned above, the 13th floor button is inside his left eye socket!
Floor: Fitness Center
An overly macho swimmer ghost fought in the Fitness Center thirteenth floor. He spends his time playing with volleyballs in an indoor pool while admiring his own physique.
- "Awesome McCool" Name: Johnny Deepend.
- Clipped-Wing Angel: After you drain the pool and trap him, the most Johnny can do is slam the ground whenever Luigi tries to suck up his goggles. It might not have much range and it's blatantly telegraphed, but it will hurt.
- Goggles Do Something Unusual: His swimming goggles can actually protect him from the Strobulb. Removing them during his first phase is impossible since Johnny can simply dive away from the Poltergust. In his second phase, however, he will be too helpless to do anything about it.
- I Know Madden Kombat: Johnny primarily fights by launching volleyballs at Luigi, in a tactic that E. Gadd describes as "dodgeball" (although it's clearly based on water polo).
- Jerk Jock: He is a muscle buff who loves taunting and showing off.
- Kill It with Water: Johnny is at least smart enough to figure out Gooigi's weakness from the get-go, considering he almost always just squirts water at him, requiring Luigi to stun him so Gooigi has enough time to turn the drain valve.
- Making a Splash: He's able to squirt water at Luigi/Gooigi. A mere annoyance to the former, but really troublesome to the latter.
- Paper Tiger: Despite his muscular build, he actually has the lowest HP of any Boss Ghost (save for Morty). This is justified as the circumstances of his fight allow for only one real chance to capture him.
- Puzzle Boss: Johnny is invincible as long as he's in his natural element, so his battle is a matter of taking him away from his pool (or, more accurately, taking the pool away from him).
- Top-Heavy Guy: Dude's built like a truck, and hits like one, too. Too bad it doesn't take long to capture him.
- Stationary Boss: After you drain Johnny's pool, he will get stuck in the drain at the bottom, unable to escape. He can still defend himself with ground pounds, but capturing him is a trivial effort by that point.
Floor: The Dance Hall
A funky, afro-wearing disco DJ diva ghost fought in the Dance Hall fourteenth floor. She plays for a troupe of breakdancing Goobs who hold the fifteenth elevator button.
- Blinding Bangs: Exploited. Her afro is big enough to cover her eyes, granting her protection from Luigi's Strobulb.
- Dance Battler: Her Goobs attack by breakdancing.
- Disco Dan: Her floor's aesthestic takes a lot of inspiration from disco imagery. She also performs the "Staying Alive" Dance Pose a few times. Her Goob crew is more inspired by old-school hip-hop and electro, as is the stage music.
- Everything's Better with Spinning: Fitting the imagery of records on a turntable, DJ Phantasmagloria's attacks mostly involve her rapidly twirling around the arena.
- Flunky Boss: If you count her breakdancing Goob crew.
- Funny Afro: Has a huge one. It's actually a wig; her real hair is much shorter. Her office behind the stage has several spare wigs.
- Graceful Loser: As shes being sucked into the Poltergust, she does a few last dance moves.
- Instrument of Murder: Employs vinyl records as projectiles and melee weapons.
- In the Hood: Her Goobs wear hoodies, protecting them from Luigi's Strobulb.
- Loud of War: Her speakers can release soundwaves that will push Luigi away, but this is otherwise a harmless annoyance, serving only to reset the first phase of her battle.
- Shell Game: Actually employed twice. The first time, a Goob will hide the button inside their hood, and the player will need to pay attention to the one Goob that's not dancing correctly. Once that one gets found out, they will toss the button to another Goob and the whole crew will start spinning/bouncing around, requiring the player to follow and then Burst the button receiver before Phantasmagloria resets the song.
- Unique Enemy: Much like Wolfgeist's ballet dancers, her breakdancers are exclusive to her fight. You can find a few Goobs with breakdancing attire later on, but they do not exhibit the same behavior as Phantasmagloria's ones, instead acting like regular Goobs.
- Visual Pun: Disco's dead, baby.
- Artificial Stupidity: When in her combat form, she actually disregards Gooigi completely and won't retreat if Gooigi is looking at her, making flashing her with Gooigi's strobulb quite a bit easier compared to trying to nab her with Luigi alone. Just face Luigi away and have Gooigi ready to hit her with the flash.
- Bakeneko and Nekomata: It's a multi-tailed ghost cat that can transform into a beast to attack. It's also accompanied by a Japanese-sounding Leitmotif and Background Music Override. Rather than two tails like it's normally depicted, Polterkitty has three. Since the split into multiple tails is said to happen when a nekomata gains power as it ages, having three suggests that it's exceedingly ancient.
- Cats Are Mean: In contrast to the excitable and affectionate Polterpup, Polterkitty is snobbish and aggressive.
- Cowardly Boss: Polterkitty is always on the run, only transforming and attacking after being cornered. And even then, it won't do anything but hiss from outside your reach unless Luigi's standing with his back turned, at which point it will attempt a sneak attack. The player can only counterattack at the very last second, otherwise it will just run away and wait for another opportunity to maul Luigi from behind.
- Evil Counterpart: To Polterpup, as it is Hellen's mean pet to Luigi's helpful one.
- Female Feline, Male Mutt: The female feline to Polterpup's male mutt.
- Hate Sink: Toys with Luigi by stealing elevator buttons, forcing him to backtrack to prior floors. Unlike the Polterpup, whose antics are played for laughs and is endearing, Polterkitty is purposefully made to be as obnoxious as possible.
- Mini-Boss: It's fought in six individual battles after it snatches and eats two of Luigi's elevator buttons over the course of the game.
- Multiple-Tailed Beast: Polterkitty has several tails that keep it from being sucked up- instead, Luigi tears off one of the tails. In the last encounter, he's able to grab the final tail and finally pull it into the vacuum.
- Panthera Awesome: It can transform into a panther-like form when fighting.
- Right-Hand Attack Dog: Though often seen resting on Hellen's lap while the latter watches Luigi, she sets off to make Luigi's life difficult a few times on her own.
- Screw This, I'm Outta Here!: The first time Luigi sucks up all of its tails, the Polterkitty hurls up the elevator button it swallowed earlier and retreats.
- Swallow the Key: It catches and gobbles up two of the Last Resort elevator buttons to prevent Luigi from making progress, forcing him to take a detour and fight the feline fiend to force it to give up the buttons.
- Tertiary Sexual Characteristics: Her eyelashes and the necklace she wears.
A Blob Monster clone of Luigi who debuts in the Nintendo 3DS remake of the first game. Professor E. Gadd created him during the events of Dark Moon and sent him back in time to his past self for testing. In the remake, he simply serves as the second player in the Co-op mode, but in Luigi's Mansion 3 he takes center stage with Luigi, being integral to puzzles and boss fights as well as serving as player 2 in local co-op.
- All There in the Manual: Much of the backstory about Gooigi's creation is found online in Professor E. Gadd's Research Journal. Such details include why Gooigi is shaped as he is, how he can capture ghosts and why it's just as well Gooigi is weak to water.
- Ambiguous Situation: It's never really made clear whether he's a separate entity from Luigi, or if Luigi controls him. He has his own personality (i.e. none) and can act alongside Luigi in co-op. However, Luigi goes into a trance when the player controls Gooigi and vice versa (which one cutscene even lampshades), Luigi seems to always know what Gooigi is doing despite no communication, and E. Gadd talks about him like he's a tool rather than a person, especially in the tutorial.
- Ascended Extra: In Luigi's Mansion 3. While still used in multiplayer, he's also incorporated into the singleplayer mode, and using him is required to solve some puzzles and defeat some bosses.
- The Bait: In order to hit Ug's T. rex skeleton host the second time, you have to deploy Gooigi as a snack for the dino, shooting its ribs with a fossilized egg while it tries to chomp down. Gooigi is also excellent bait for Slinkers, as they'll shift to trying to grab him rather than Luigi when Gooigi is out, making them sitting ducks for Luigi as they constrict Gooigi's shoulders. Using Gooigi as bait is also useful for taking down Chest Monster ghosts that would otherwise swallow Luigi whole. The dynamic is inverted if you use him during the Polterkitty fights; it's much easier to stun it by using Luigi as bait and attack as Gooigi, whom the cat ignores.
- The Comically Serious: While he shares Luigi's happy reactions to acquiring items, and some of his animations, Gooigi is completely unresponsive to almost all stimuli. Ghost taps him, boss ghost gets mad, elevator button bounces off his head? He just stands there as still and emotionless as a statue, which annoys and confuses the ghosts. Granted, he is a blob of goo.
- Blob Monster: He's composed of green goo, and can liquefy and reform at will. If he loses his 25 hit points, he can respawn later without need of a Gold Bone.
- Death Is Cheap: In 3, no matter how many times he kicks the bucket he can always be reformed by Luigi. Justified, he is made of goo, after all.
- Evil-Detecting Dog: He's used like a radar to find the hidden Boos, something in composition resonates with Boos making him wiggle around like jelly when near one.
- Featureless Protagonist: Is talked about as if he's not sentient, and he doesn't react to things like jumpscares from Slinkers (though he can be grabbed). Fair enough, since he seems to just be a Luigi-shaped mass of psycho-reactive slimenote . However, he is key to solving several puzzles and can visit places Luigi isn't able to by squeezing through grates or spikes. While his multiplayer aspect was heavily advertised prior to release, he's essential in single player as well.
- Footprints of Muck: More watery than mucky but he leaves them behind in 3. Justified since he's made out of a slimy goo.
- Holler Button: In 3, Gooigi can also call out for Mario just like Luigi, and call out to teammates in the Scarescraper.
- The Lancer: Luigi's sidekick throughout 3. He even gets to be on the box art!
- Logical Weakness: Unlike Luigi, Gooigi can be harmed by water and fire. However, Gooigi can not be harmed by sharp objects, especially arrows, that Luigi might get hurt by. He also has 25 hit points instead of 99, but can respawn later if he loses his hit points (unlike Luigi, who needs Gold Bones to get Polterpup to revive him; if Luigi's lost all hit points with no Gold Bone for Polterpup, it's Game Over). He can also regenerate if he avoids damage long enough.
- Gooigi's gelatinous body lets him easily pass through bars or grates, but it also means he's incapable of climbing ropes and ladders or standing on terrain like scaffolding without falling straight through.
- Not So Above It All: In 3, on The Dance Hall level during the battle against the dancer Goobs, while Gooigi doesn't move his feet to the beat like Luigi does, even he can't resist snapping his fingers to the music.
- Not So Stoic: During the ending, he does show some emotion when the hotel collapses with him and Luigi still on it by waving at him before the two plummet, though it comes off more as Dissonant Serenity given the circumstances (he slams against the concrete, since Polterpup could only catch Luigi, of course with Gooigi being made of goo he's perfectly fine). After all the chaos and destruction, Gooigi's only response is to give Luigi a thumbs up. Additionally, during the ending cutscene, he waves goodbye to Luigi and co. after some hesitation, implying he may have developed sentience over the course of the story.
- Regenerating Health: Unlike Luigi, Gooigi regains health after a short while if he takes no damage.
- Weaksauce Weakness: He'll completely melt if he gets wet, and unfortunately, water is a pretty common substance, especially on the Boilerworks level of 3, which is almost entirely flooded and also a level where Gooigi is vital to get through.