King Boo: Difference between revisions

[[File:LM 3DS Bowser King Boo.png|thumb|200px|The fight in the 3DS remake]]

[[File:King Boo Artwork - Luigi's Mansion Dark Moon.png|thumb|180px|King Boo's appearance in ''Luigi's Mansion: Dark Moon'']]

King Boo appears as the final boss for ''[[Luigi's Mansion Arcade]]'', leading his ghosts in an uprising to get revenge on Luigi and Professor E. Gadd. However, after Luigi has sucked in all of his minions with the [[Poltergust 5000]], King Boo assaults Luigi on the [[Terrace (Luigi's Mansion: Dark Moon)|terrace]] of the [[Treacherous Mansion]]. Protected by a magical barrier, he can only be attacked once he lets his guard down. King Boo throws bombs at the player, moves very quickly and clones himself multiple times over the course of the fight. However, only the original has the power-enhancing gem on his crown. Just like in ''Luigi's Mansion: Dark Moon'', he escapes the Poltergust 5000 two times before being defeated for good.

[[File: LM3 E3 screen 04.png|thumb|275px|King Boo chasing Luigi down a hallway]]

King Boo reappears in ''[[Luigi's Mansion 3]]'' with the same design as in ''Luigi's Mansion: Dark Moon'', but with more detail on his crown and a more expressive scowl. King Boo is one of the two main antagonists, having been released by the other main antagonist [[Hellen Gravely]], the owner of [[The Last Resort]] hotel and a big fan of his, in order to impress him. Seeking revenge on Luigi for his previous defeats, he traps Professor E. Gadd, Mario, [[Princess Peach]], and the three [[Toad (species)|Toads]] in portraits before going after Luigi, who manages to escape his capture by going down a laundry chute. He later ends up entrusting Hellen Gravely with Mario's portrait, although it's implied that he intended for Luigi to win both due to Gravely's failures by that time and so he could capture both alongside Peach by using the latter as bait, also recapturing the Toads and Professor E. Gadd just after Mario was freed. However, he ultimately fails to capture Luigi atop the hotel due to [[Polterpup]] shoving him out of the way of King Boo's portrait, and then proceeds to battle Luigi. To defeat King Boo, Luigi must throw a bomb from a spiked ball King Boo throws into his mouth, then pull on his tongue with [[Gooigi]]'s help and slam him repeatedly. Upon doing so, King Boo will then generate a clone that attacks alongside him. After this is done twice, King Boo will enlarge the painting, and Luigi will then have four minutes to attack King Boo one last time. The battle ends with King Boo being recaptured by Luigi and placed in a containment jar alongside Gravely, much to his frustration. As the purple gem in his crown was taken by Luigi after the final battle, it is missing from his crown.<ref>ProsafiaGaming. (October 30, 2019). [https://youtu.be/GYyMEi0iTZw?t=643 Luigi's Mansion 3 - All Endings & Ranks + Credits]. ''YouTube''. Retrieved November 20, 2019.</ref>

[[File:KingBoo SuperMarioKun.jpg|thumb|left]]

[[File:Petey Piranha and King Boo - Mario Kart Double Dash.png|left|thumb|175px|King Boo and [[Petey Piranha]] in ''Mario Kart: Double Dash!!'']]

King Boo is an unlockable character in the racing game ''[[Mario Kart: Double Dash!!]]''. This is his first appearance in a spin-off, and also his first playable appearance, resulting in further appearances in the [[Mario Kart (series)|''Mario Kart'' series]]. Despite being a ghost, King Boo is classified as a heavyweight driver due to his large size. His partner is [[Petey Piranha]], and both have the ability to use almost any other character's special item (if they are going to get a special item, it is randomly chosen, based on their race position). They cannot receive the [[Green Fireball]] or the [[Birdo's Egg]], however. These characters are unlocked by winning the [[Star Cup]] in Mirror Mode.

 

King Boo's personal kart is the [[Boo Pipes]], which is a gray version of Petey's [[Piranha Pipes]] kart, but with an image of a Boo instead of a Piranha Plant where the item-using partner stands. However, the more important difference between the two is that, while the Piranha Pipes has high speed and low acceleration, the Boo Pipes is vice versa, with low speed and high acceleration. The only other heavy kart like this is the [[Offroader]] in ''Mario Kart Wii''.

 

King Boo appears to slightly shrink when he becomes the driver. On the second "Thanks for Playing!" screen (after beating the Special Cup with a Gold Trophy while all other cups already have a Gold Trophy), King Boo appears in the background chasing [[Wario]] and [[Waluigi]].

In ''[[Mario Kart DS]]'', King Boo, along with six other bosses from ''Super Mario 64 DS'', re-appears as one of the bosses of the Mission Mode. King Boo is the boss of the fourth level, with the playable character being [[Princess Peach|Peach]]. Peach attempts to collect 50 [[coin]]s on the [[Lava Arena]] within the time limit, but after a few seconds King Boo appears, surrounds her, and then attacks her, stealing ten of her coins and making all uncollected coins disappear, before teleporting to another area of the arena. To take them back, Peach has to drive and bump into King Boo, making him transparent. Then, she can drive through him again, retrieving her coins and making the other coins reappear. However, King Boo soon reappears a few moments later to get the coins again. After collecting all fifty coins, Peach finally defeats King Boo. Additionally, the [[Bowser]] and King Boo painting from ''[[Luigi's Mansion]]'' appears in the [[DS Luigi's Mansion|Luigi's Mansion]] race course, although only Bowser can be seen in the painting.{{br|left}}

King Boo makes a cameo appearance in ''[[Mario Kart Arcade GP 2]]'' on the [[Yoshi Park 2]] course in the Horror House. Here, a large picture of him appears near the end of the course where it inhales many ghosts and the racers. As the player drives into his mouth, they are warped back to the beginning of the course.

[[File:MKW SNES Ghost Valley 2 Screenshot 2.png|thumb|King Boo in ''Mario Kart Wii'']]

King Boo returns as a playable character in ''[[Mario Kart 8 Deluxe]]'', the enhanced port of ''[[Mario Kart 8]]'' released for [[Nintendo Switch]]. He is among the lightest of the five heavyweight groups, sharing his statistics with [[Rosalina]], [[Link]], and [[Pauline]]. He has the lowest top speed and weight of all the heavyweights, all while sharing similar acceleration as other heavy groups. However, his handling is amongst the best of the heavyweights (shared with the [[Metal Mario|metal]] [[Pink Gold Peach|characters]] and Petey Piranha). He also has the strongest mini-turbo boost of the heavyweights. Finally, his traction stat is noticeably strong, being far and away the best in his weight class, and the third best base traction stat in the game. Additionally, his horn sound is the sound that [[King Boo (Super Mario Sunshine)|King Boo]] from ''[[Super Mario Sunshine]]'' makes when hit by a [[pepper]]. He is the 150cc Staff Ghost for {{classic-link|GBA|Boo Lake}} and the 200cc Staff Ghost for three courses: [[Twisted Mansion]], {{classic-link|GBA|Snow Land}}, and {{classic-link|3DS|Rosalina's Ice World}}. Initially, King Boo did not have a [[rival]] character for Grand Prix mode, but upon release of Wave 5 of the ''[[Mario Kart 8 Deluxe - Booster Course Pass|Booster Course Pass]]'' DLC, King Boo was given a rival in the form of Petey Piranha and also became Petey Piranha's rival, likely a nod to their status as partners in ''[[Mario Kart: Double Dash!!]]'' He is the only base game character to gain a rival through the ''Booster Course Pass''.

[[File:MKT King Boo Luigi's Mansion.jpg|thumb|left|170px|'''King Boo (Luigi's Mansion)''' in ''Mario Kart Tour'']]

[[File:SM64DS BBH Kingboo.png|thumb|Mario encountering King Boo in ''Super Mario 64 DS'']]

King Boo appears in ''[[Super Mario 64]]''{{'}}s [[Nintendo DS]] remake, ''[[Super Mario 64 DS]]'', imprisoning [[Luigi]] behind a [[painting]] in [[Big Boo's Haunt]]. When [[Mario]] enters the [[Big Boo Battle]] level to save Luigi, King Boo greets him. From there, the player must listen for King Boo's cackle and enter the door where it is loudest. Eventually, the player reaches the end and fights King Boo to free Luigi. To defeat King Boo, the player has to follow King Boo's movements in the arena's mirror and [[stomp]] him when he comes close enough. Defeating him results in King Boo giving out the [[Luigi Key]]. The player can fight him again as different characters, notably Luigi (who can be fought before unlocking him with [[Luigi Cap|his cap]]) and [[Wario]]. When Luigi meets King Boo, he is confused but proceeds to attack him anyway. When Wario fights him, King Boo is alarmed by his appearance and attempts to scare and attack him.  

In English and other localizations, King Boo is incorrectly called [[Big Boo]], even though he is clearly different from the Big Boo of Big Boo's Haunt. Internally, they do use the same model, with a modifier denoting the presence of the crown.

[[File:SMBWKingBoo.png|thumb|King Boo in ''Super Mario Bros. Wonder'']]

In ''[[Super Mario Bros. Wonder]]'', King Boo appears in the levels [[Light-Switch Mansion]] and [[The Final Battle! Bowser's Rage Stage]], where he chases the player(s) in a similar manner to [[Boohemoth]] in ''[[New Super Mario Bros. 2]]''.<ref name=CM>Nintendo 公式チャンネル (September 28, 2023). [https://youtu.be/SiLFeqd99cw スーパーマリオブラザーズ ワンダー CM ワンダー篇]. ''YouTube''. Retrieved September 28, 2023.</ref> In Light-Switch Mansion, King Boo appears once the [[Wonder Flower]] is collected and the [[Wonder Effect]] "A Night at Boo's Opera" is activated. King Boo then chases the player(s) through the level while singing with an operatic baritone voice. If he is looked at, he will cover his face and continue singing, albeit with a voice distortion filter. Once the [[Wonder Seed]] is collected, King Boo's crown will fall off as he shrinks into a regular Boo.<ref>YTSunny. (October 19, 2023). [https://youtu.be/KWRFFbE5OXc Super Mario Bros Wonder - All Songs / Music Levels]. ''YouTube''. Retrieved November 4, 2023.</ref> In The Final Battle! Bowser's Rage Stage, King Boo appears once the player(s) reach the Jack-o-Lantern pumpkins, acting as he does in the other level. Once players enter the zero-gravity section, King Boo again loses his crown and shrinks into a regular Boo, although he floats away off-screen surrounded with music notes.<ref>Mixeli. (October 19, 2023). [https://youtu.be/jRiP86jxIME Super Mario Bros. Wonder - Final Boss Bowser Battle and Ending (HQ)]. ''YouTube''. Retrieved November 4, 2023.</ref>

King Boo is a playable character in ''[[Mario Superstar Baseball]]'' and a member of [[Wario]]'s baseball team, the [[Wario Greats]]. He is a default character, meaning he does not need to be unlocked. He is a power hitter, using his white, crowned, Boo-like baseball bat to hit long outfield drives and even homeruns. King Boo has good chemistry with [[Boo]] and [[Petey Piranha]], and he has bad chemistry with [[Luigi]] and [[Baby Luigi]]. However, like Boo, his hits are usually very curved, and this causes them to be fouls most of the time.

[[File:MSS King Boo Batting Screenshot.png|thumb|King Boo batting at [[Yoshi Park]] at night]]

King Boo reappears in ''[[Mario Super Sluggers]]'' and is one of the few characters on Wario's team in both games, along with [[Boo]] and [[Waluigi]]. He is once again a power hitter, and he also excels in pitching, with both stats being his highest, though his running and fielding are still rather poor. In Challenge Mode, he appears immediately after the player defeats [[Bowser Jr.]] at the [[Wario City]] stadium, stating that he turned invisible and was watching the whole game. However, he is uninterested in joining the player's team unless the team has some [[Boo]]s with them. This is accomplished by both recruiting Boo and finding the [[Mini Boo]] item. King Boo has good chemistry with [[Petey Piranha]], [[Boo]], [[Wiggler]], and [[King K. Rool]], but he has bad chemistry with [[Mario]], [[Luigi]], [[Yoshi]], [[Baby Mario]], [[Baby Luigi]], [[Baby Peach]], and [[Baby Daisy]].

 

His baseball bat no longer has a physical crown on it. In this game, it is represented as a crown picture above the "Boo mouth" picture. As well, in this game only, the colors of the jewels on his crown are reversed.

[[File:Shriek Mansion 3-6.png|thumb|left|[[Princess Peach]] battling King Boo in ''Super Princess Peach'']]

King Boo aids Bowser in ''[[Super Princess Peach]]'' by appearing as the boss of [[Shriek Mansion]]. After adventuring through [[Vibe Island]], Peach discovers where King Boo is and engages him in combat. During the battle, King Boo fires blue homing [[Fireball|fireballs]] at Peach and chases her regardless of whether she looks at him or not. Peach can damage King Boo with direct light, which is made by having his own flames light the candles spread throughout the room. After a few attacks, King Boo uses his [[Gloom]] vibe, which causes him to cry, which extinguishes the candle flames. After enough attacks, King Boo is eventually defeated. With King Boo eliminated, Peach rescues the Toad and continues against Bowser's forces.

King Boo makes his first appearance in a ''[[Mario Party (series)|Mario Party]]'' game in ''[[Mario Party 8]]''. He gives out [[Star (Mario Party series)|Stars]] on his own board [[King Boo's Haunted Hideaway]]. He hides in one out of three altars and gives the player a Star for ten coins if they can find him where he is hiding. If the player is able to buy the Star, he starts to "summon the bizarre" and disappears, causing the player to jump into a [[Warp Pipe]] that returns them to the starting point. This "makeover mojo" causes the whole layout of the course to change. However, if they do not have enough coins, King Boo causes a pitfall to appear under the player, causing them to return to the starting point and allowing the next player that reaches him to buy the Star. Additionally, if the player fails to steal anything from the board event Pickpocket Pinball, the hosting [[Little Mouser|mouse]] sounds like King Boo. The player can purchase King Boo sounds from the [[Fun Bazaar]], along with a figurine titled "King Boo's Revenge". When the player presses {{button|wii|A}} on the figurine during the Figurine Parade, King Boo floats up and gives off a brilliant glow, as if he is a light bulb.

[[File:MP9 King Boo's Puzzle Attack 1.png|250px|thumb|left|King Boo in ''Mario Party 9'']]

 

[[File:King Boo's Tricky Tiles MP10.png|thumb|King Boo as he appears in ''Mario Party 10'']]

King Boo reappears in the next title, ''[[Mario Party 10]]''. He returns as a boss in the minigame [[King Boo's Tricky Tiles]]. In order to defeat him, the player must remember which platforms are false, and then run around until they can jump on a light switch (one is worth 3 points, and another worth 1 point). Like other bosses, King Boo gets angered after the players deplete his health halfway. The technique that King Boo uses is that he swaps Boos with platforms and he blocks the camera, so the player can't see the platforms very well and remember which ones are false. He can also be seen on the [[Luigi Board]], which appears in the game's amiibo Party mode.

King Boo appears in ''[[Mario Party Superstars]]'' on [[Horror Land]], replacing the Big Boo found on the original board.<ref>Nintendo. (September 23, 2021). [https://www.youtube.com/watch?v=dG9fAtmYdlM Nintendo Direct - 9.23.2021]. ''YouTube''. Retrieved September 23, 2021.</ref> He summons Boo lackeys to steal coins (for free) or Stars (for 150 coins) from all opponents who have any. As with the Big Boo in the original, he can only be encountered at night and only through a path that requires a [[Skeleton Key]].

[[File:KingBoo MASATOWG.png|thumb|A screenshot depicting King Boo in the Nintendo DS version of ''Mario & Sonic at the Olympic Winter Games'']]

In the [[Mario & Sonic (series)|''Mario & Sonic'' series]], King Boo typically has the role of being a rival. In the [[Wii]] version of ''[[Mario & Sonic at the Olympic Winter Games (Wii)|Mario & Sonic at the Olympic Winter Games]]'', King Boo is both the first and sixth (in Individual Festival mode only) rival. King Boo races the player in the [[Alpine Skiing Downhill]] event in both Individual and Group Festival modes, but he only races the player in Giant Slalom in the Individual Festival mode, making him the only rival that can potentially be faced more than once. King Boo has no skis so he goes down the hill smoothly. If the player loses to him, the guide (either [[Cream (character)|Cream]] or [[Toad]]) says that it is unfair because King Boo has no skis. In the Wii version of ''[[Mario & Sonic at the London 2012 Olympic Games (Wii)|Mario & Sonic at the London 2012 Olympic Games]]'', King Boo is one of the rival characters that can be found in the London Party mode, and when he is encountered, he challenges the player to the [[Dream Sprint]] event, with stickers being offered as a reward for beating him. In ''[[Mario & Sonic at the Sochi 2014 Olympic Winter Games]]'', King Boo is a rival in the [[Mario & Sonic at the Sochi 2014 Olympic Winter Games#Legends Showdown|Legends Showdown]] mode, appearing in Area 4, and is raced against in [[Short Track Speed Skating 1000m]].

King Boo has had a role in some of the series' single-player campaigns. In the [[Mario & Sonic at the Olympic Winter Games (Nintendo DS)#Adventure Tours story|Adventure Tours]] mode in the [[Nintendo DS]] version of ''[[Mario & Sonic at the Olympic Winter Games (Nintendo DS)|Mario & Sonic at the Olympic Winter Games]]'', King Boo is the mid-boss of [[Polastraits]], and when Mario/Sonic approaches him, King Boo tells then that he must race someone who is afraid of him. He selects Luigi and they must race in Giant Slalom. In this version, King Boo is transparent and the player can ski through him. He also appears slightly larger than in his other appearances. In the [[Nintendo 3DS]] version of ''[[Mario & Sonic at the London 2012 Olympic Games (Nintendo 3DS)|Mario & Sonic at the London 2012 Olympic Games]]'', King Boo appears in the Story Mode, where he helps guard the [[Phantasmal Fog]] at the [[Tower of London]], and teams up with a Boo to challenge [[Sonic]] and [[Tails]] in [[Badminton (Doubles)]]. When defeated, he and the Boo flee, and King Boo later appears at the opening ceremony for the games.

Additionally, in the Nintendo 3DS version of ''Mario & Sonic at the London 2012 Olympic Games'', a [[List of badges in Mario & Sonic at the London 2012 Olympic Games (Nintendo 3DS)|badge]] of King Boo can be obtained from the badge machine.

King Boo makes a cameo appearance in ''[[Mario Golf: World Tour]]'' on Hole 4 of [[Bowser's Castle (golf course)|Bowser's Castle]]. He is floating in the background alongside other [[Boo]]s, and he is also much larger than in other games. His name can also appear on the tournament scoreboard.

There are a few items of King Boo in the [[Super Smash Bros. (series)|''Super Smash Bros.'' series]]. In ''[[Super Smash Bros. for Nintendo 3DS]]'', there is a [[Trophy (Super Smash Bros. series)|trophy]] of King Boo. In ''[[Super Smash Bros. Ultimate]]'', King appears in his ''Luigi's Mansion: Dark Moon'' design as an Advanced-class Neutral-type primary [[Spirit (Super Smash Bros. Ultimate)|spirit]], which is enhanced from the Boo spirit after it has reached level 99. When equipped, the spirit grants the fighter slower fall speed after jumping and has 3 support slots. King Boo is listed as the 49th spirit, though he was listed as the 121st spirit alongside the rest of the spirits from the ''Luigi's Mansion'' series in version 1.0.0.<ref>BeardBear (December 6, 2018). [https://youtu.be/CiK68gO5XQM?t=336 Super Smash Bros. Ultimate - All 1297 Spirits]. ''YouTube''. Retrieved December 23, 2018.</ref>

The splitting attack used by King Boo is a reference to (if not a direct copy of) the [[Dark Star]]'s splitting attack in ''[[Mario & Luigi: Bowser's Inside Story]]'', except King Boo takes damage if countered unlike the Dark Star's version due to it being invincible. As well, if the Mario Bros. continue to attack King Boo without freeing Paper Mario, his slapping Paper Mario may be an allusion to [[Lady Bow]] and her slap attacks<ref>https://www.youtube.com/watch?v=74SYLTwZ2Aw</ref>. Also, King Boo's voice clips from ''[[Mario Kart Wii]]'' are reused.

King Boo appears in ''[[Dr. Mario World]]'' as assistants, added on November 14th, 2019.<ref>DrMarioWorld_EN. (November 14, 2019). [https://twitter.com/Drmarioworld_EN/status/1195137397639536641 ''Twitter'']. Retrieved September 28, 2020.</ref> He is a battle box-exclusive assistant, only obtainable from battle boxes for tier 7 or above in versus mode. In versus mode, he has a chance of sending 2 extra rows of viruses to the opponent if the attack lands. In stage mode, he grants a chance of 5 extra capsules being added when 5 capsules are remaining, which will have a chance to activate again if the condition is met again but didn't activate earlier. However, it won't activate for the rest of the stage if this effect has successfully activated.  

King Boo has a minor appearance in ''[[The Super Mario Bros. Movie]]'' at Bowser and Peach's wedding with his ''Super Mario'' design. He is seen sitting a few rows behind [[King Bob-omb]]. He does not have any role in the climax nor does he speak. He disappears once Peach, Mario, and [[Donkey Kong]] crash the wedding. Compared to his usual design, his face is smaller and is more expressive, taking up less space on his overall body. He is also the only Boo that appears in the movie.

King Boo is a mischievous villain who enjoys scaring and tricking his enemies by creating illusions and then overpowering and trapping them. King Boo often taunts Luigi and E. Gadd. In ''Luigi's Mansion 3'', for instance, King Boo mocks Mario and Luigi's Italian accent by saying, "It's-a me, King Boo!", and in ''Luigi's Mansion: Dark Moon'' he pretends to confuse between Luigi and Baby Luigi. In ''[[Mario & Sonic at the Olympic Winter Games (Nintendo DS)|Mario & Sonic at the Olympic Winter Games]]'', he insists on racing against Luigi, knowing how afraid he is of ghosts. King Boo also holds grudges, referring to his prior defeat in ''Luigi's Mansion'' sarcastically as "Good times" and he has stated that he is "sick to double death" of Luigi. In frustration, he recites the noise of the [[Poltergust 3000]], which he refers as a "disgusting machine", capturing him.

[[File:LM3 King Boo Final Battle.png|thumb|200px|In ''Luigi's Mansion 3'', King Boo can create clones and shoot fireballs from his crown.]]

===[[Luigi's Mansion (series)|''Luigi's Mansion'' series]]===

*"''White gloves! A cute little moustache! Soft shoes! How did you get out of my...? ... Huh? Wait just a second... Your clothes are...green... Hey, you must be Luigi! Whoa, you had me a bit confused for a moment there! What? You want me to release Mario? Riiiiight. No, no, no. I will not give up my favorite decoration. I like Mario just where he is. Hey, so what's that you got there? A Poltergust 3000?! Uh oh! What should we do, Boos? Good idea, guys! All Boos in this area, gather your strength! We'll blow him away!!! ... We'll take a big Boo breath... ...and blow you away!!''" - ''Luigi's Mansion''

*"''Aahh, I could just stare at my Mario painting for hours! It's true what they say about fine art...it takes utterly refined sensibilities to truly appreciate it! The way you plead for help, Mario... I find it so...satisfying. Perhaps that is merely because I remember how much trouble you've caused me in the past. ... Seriously, though, who would actually believe that mansions get given away in contests?! Talk about stupid! What do they feed you Mario brothers anyway...gullible soup? Your brother came all this way just to get turned into a painting... It's just terrific. However... This Mario painting looks lonely... I must have a Luigi painting as well! Then my gallery will truly be complete! Bleah HA HA! I am not afraid of you, fool! I fear only that infernal Poltergust 3000 you carry on your back! Stupid machine! But I am a KING among Boos! I swear it... I shall fear no mere house-cleaning device!! I must say...I despise the way you SHWEEERRPP-SHLOOOOP-WHOOORPP-SHLEEEOOORG-vacuumed up all my friends! Don't imagine that I'll flee... I'll fight you like a true Boo! Now join your brother... ...inside the painting!''" - ''Luigi's Mansion''

*"''Mwah ha ha! Now what do we have here? Why, if it isn't my old pal Luigi! Or is it [[Baby Luigi]]? I can't tell the difference. Hey, remember that time you trapped me in a painting for all eternity? Good times. But guess what? I GOT OUT! And now I'm painting the town RED! Yes, it was I who broke the [[Dark Moon]]! This power-enhancing jeweled crown of mine made it easy. And now that all the ghosts of [[Evershade Valley]] are under my control, it's time to take my rightful place as supreme ruler of your world! [[Luigi|You]], [[Professor Elvin Gadd|that annoying scientist]], and all your friends will look great hanging from the wall of my throne room! Aaaaaahahaha!''" - ''[[Luigi's Mansion: Dark Moon]]''

*"''Gwahaha! If it isn't my good friend, Luigi! It's me, your ol' pal KING BOO! Y-You're not telling me you FORGOT ME!? Well, I certainly haven't forgotten YOU! You, that ratty vacuum cleaner, and that stinky old geezer who made it! I haven't forgiven what you did to me, so I've led the ghosts here in an uprising! But you... you and that [[Poltergust 5000|DISGUSTING machine]] just SHLEEEERP-SHWOOOOOP-SWHLOOORPSHLOOOORP-SHWEEEERPed them all up! You think I'll let you get away with that!? You're going down this time, Green 'Stache!''" - ''[[Luigi Mansion Arcade]]''

*"''Mwah ha ha! Surprise, Luigi! It's-a me, King Boo! [[Professor Elvin Gadd|That old coot]] had me locked up tight in his lab... But guess what? I GOT OUT! The [[Hellen Gravely|hotel owner]] here was just dying to meet me, so she busted me out. Pretty lucky, huh? Anyway, I didn't think that you'd actually show up here. I was ready though, just in case. In fact, my vengeance is nearly complete! What do I mean by "vengeance"? Glad you asked! I'm trapping you and everyone in your vacation party... in frames! Awww, there there, Luigi. It'll be over soon. It's time for a family reunion! BOO-YA! [...] Mwah ha ha! Take THAT! Oh, and there's one more frame, of course. I saved it especially for you! Stay right there and put on your best terrified face, Luigi! This is [[Game Over|game over]]!''" - ''[[Luigi's Mansion 3]]''

*"''Mwa ha ha! How brash of you to come and face me, Luigi! You should have just run away while you had the chance! But instead you stayed and fought all the way up here to oppose me? How foolish! You may have made your way through the hotel using [[Poltergust G-00|E. Gadd's frustrating inventions]] to suck up all the ghosts in your path... You were all SHWEERRPP-SHLOOOOP-WHOOORPP-SHLEEOOORG! Ahem. Anyway, just because you vacuumed up all of those ghosts doesn't mean you can take me on! It doesn't matter that you beat the [[Hellen Gravely|hotel owner]]... Hellen Gravely! Ooooooo! She let all your friends get away! It's so frustrating when you trap something in a painting and it gets out, you know? Arg! Hellen Gravely... All those ghosts... Useless! I have to do everything myself! I'm sick of this! No more mercy for you, Luigi! No more tricks--no more carefully laid plans! Now it's time for raw King Boo gusto! You're all going in a painting! An ensemble portrait is your fate!''" - ''Luigi's Mansion 3''

*"''Mwa ha ha! Serves you right! Just a few left. Go on! Join them! My painting must be complete! Sorry to keep you waiting. Are you ready? I don't care!''" - ''Luigi's Mansion 3''

*"''...Hmm? One-two-three-four-five-six-sev-- WAIT! There should be seven! Who's missing!? [...] Luigi! What are you doing over there?! UGH! That's it! I'm sick to double death of you! You want to fight me? FINE! Let's go, Luigi! This is the end for you, once and for all! HERE I COME!''" - ''Luigi's Mansion 3''

===''[[Super Mario 64 DS]]''===

*(to Mario before getting Luigi's key) "''Eee hee hee! I am Big Boo, the spookiest of all the spirits! I locked up the whimpy green moustache man. And I'll do the same to you! Eee hee hee! Since I'm a ghost, I can turn invisible in the mirror's reflection. You'll have to attack me from behind to defeat me. But you'll die of fright before that ever happens! And then you'll be one of us!''"

*(to Mario after getting Luigi's key) "''Eee hee hee... I am Big Boo, the spookiest of all the spirits. I love scaring wimpy humans. Eee hee hee... You'll never sneak behind me!''"

 

*"''Now, how about my 10 coins? Fork 'em over. I've got that [[Star (Mario Party series)|Star]] right here...''"

 

===''[[Mario Super Sluggers]]''===

 

===''[[Mario & Sonic at the Olympic Winter Games]]''===

*"''You?! I might have known. Just what I need, some fool who ain't afraid of a ghost! My little Boos came crying to me about you... Outrageous!''" - ''Mario & Sonic at the Olympic Winter Games'' (DS)

 

===''[[Mario & Luigi: Paper Jam]]''===

*"''Look at this [[Paper Mario (character)|little scrap]]. Friend of yours, is he? Well, if you like your friend, you better stop attacking me! Now, don't go thinking it's OK to attack [[Paper Boo|my little minion]] either. Who knows what could happen if he dropped your little friend there... You got that?''"

{|class="wikitable sortable" width=100%

!width=20%|Description

!width=20%|Release date

|''[[Luigi's Mansion]]''

|Main antagonist, final boss

|2001

|[[Nintendo GameCube]]

|-

|''[[Mario Kart: Double Dash!!]]''

|Unlockable playable character

|2003

|Nintendo GameCube

|-

|''[[Super Mario 64 DS]]''

|Boss

|2004

|[[Nintendo DS]]

|-

|''[[Mario Superstar Baseball]]''

|Playable character

|2005

|Nintendo GameCube

|-

|''[[Super Princess Peach]]''

|Boss

|2005

|Nintendo DS

|-

|''[[Mario Kart DS]]''

|Boss

|2005

|Nintendo DS

|-

|''[[Mario Party 8]]''

|Non-playable character

|2007

|[[Wii]]

|-

|''[[Mario Kart Arcade GP 2]]''

|Cameo

|2007

|Arcade

|-

|''[[Mario Kart Wii]]''

|Unlockable playable character

|2008

|Wii

|-

|''[[Mario Super Sluggers]]''  

|Playable character

|2008

|Wii

|-

|''[[Mario & Sonic at the Olympic Winter Games (Nintendo DS)|Mario & Sonic at the Olympic Winter Games]]''  

|Rival

|2009

|Nintendo DS

|-

|''[[Mario & Sonic at the London 2012 Olympic Games (Wii)|Mario & Sonic at the London 2012 Olympic Games]]''

|Rival

|2011

|Wii

|''[[Mario & Sonic at the London 2012 Olympic Games (Nintendo 3DS)|Mario & Sonic at the London 2012 Olympic Games]]''

|''[[Mario Party 9]]''

|Boss

|2012

|Wii

|-

|''[[Luigi's Mansion: Dark Moon]]''

|Main antagonist, final boss

|2013

|Nintendo 3DS

|-

|''[[New Super Luigi U]]''

|Cameo

|2013

|[[Wii U]]

|-

|''[[Mario & Sonic at the Sochi 2014 Olympic Winter Games]]''

|Rival

|2013

|Wii U

|-

|''[[Mario Golf: World Tour]]''

|Non-playable character/cameo

|2014

|Nintendo 3DS

|-

|''[[Super Smash Bros. for Nintendo 3DS]]''

|Trophy

|2014

|Nintendo 3DS

|-

|''[[Mario Party 10]]''

|Boss

|2015

|Wii U

|-

|''[[Puzzle & Dragons: Super Mario Bros. Edition]]''

|Boss

|2015

|Nintendo 3DS

|-

|''[[Mario & Luigi: Paper Jam]]''

|Boss

|2015

|Nintendo 3DS

|-

|''[[Luigi's Mansion Arcade]]''

|Main antagonist, final boss

|2015

|Arcade

|-

|''[[Mario Party: Star Rush]]''

|Boss

|2016

|Nintendo 3DS

|-

|''[[Mario Kart 8 Deluxe]]''

|Playable character

|2017

|[[Nintendo Switch]]

|-

|''[[Mario Kart Arcade GP DX]]''

|Playable character <small>(during a limited-time event)</small><br>Unlockable playable character <small>(for permanent use, through a limited-time event)</small>

|2017

|Arcade

|-

|''[[Mario + Rabbids Kingdom Battle]]''

|Cameo

|2017

|Nintendo Switch

|-

|''[[Mario Tennis Aces]]'' (version 2.0.0)

|Boss

|2018

|Nintendo Switch

|-

|''[[Luigi's Mansion (Nintendo 3DS)|Luigi's Mansion]]''

|Main antagonist, final boss

|2018

|Nintendo 3DS

|-

|''[[Super Smash Bros. Ultimate]]''

|Spirit

|2018

|Nintendo Switch

|-

|''[[New Super Mario Bros. U Deluxe]]''

|Cameo

|2019

|Nintendo Switch

|-

|''[[Dr. Mario World]]''

|Assistant (update)

|2019

|iOS / Android

|-

|''[[Mario Kart Tour]]''

|Unlockable playable character (update)

|2019

|iOS / Android

|-

|''[[Tetris 99]]''

|Cameo in TETRIS x Luigi's Mansion 3 Event

|2019

|Nintendo Switch

|-

|''[[Luigi's Mansion 3]]''

|Main antagonist, final boss

|2019

|Nintendo Switch

|-

|''[[Mario Party Superstars]]''

|Non-playable character

|2021

|Nintendo Switch

|-

|''[[Mario Kart Live: Home Circuit]]'' (version 2.0.0)

|Non-playable character

|2021

|Nintendo Switch

|-

|''[[Super Mario Bros. Wonder]]''

|Enemy

|2023

|Nintendo Switch

|}

*King Boo's laugh originating from ''Luigi's Mansion'' is actually a pitched-up version of a stock laughing sound effect.<ref>(October 7, 2022). [https://soundeffects.fandom.com/wiki/Sound_Ideas,_CARTOON,_LAUGHTER_-_LOW,_THROATY_LAUGH,_HUMAN_01 Sound Ideas, CARTOON, LAUGHTER - LOW, THROATY LAUGH, HUMAN 01]. ''Soundeffects Wiki''. Retrieved October 10, 2022.</ref> A pitched-down version of the same effect was previously used for [[Bleak]].