Editing Boo

|latest_portrayal=[[Sanae Uchida]] ([[List of games by date#2004|2004]]–present)

'''Boos''', originally known as '''"Boo" Diddlys'''<ref>{{cite|date=1990|title=''Super Mario Bros. 3'' instruction booklet|publisher=Nintendo of America|language=en-us|page=38}}</ref> (a nod to American R&B singer {{wp|Bo Diddley}}) and later '''Boo Buddies'''<ref>{{cite|date=1991|title=''Super Mario World'' instruction booklet|publisher=Nintendo of America|language=en-us|page=24}}</ref><ref>{{cite|date=1991|title=''Yoshi'' (NES) instruction booklet|publisher=Nintendo of America|language=en-us|page=5 and 12}}</ref><ref>{{cite|date=1991|title=''Yoshi'' (Game Boy) instruction booklet|publisher=Nintendo of America|language=en-us|page=4 and 11}}</ref><ref>{{cite|author=Miller, Kent and Terry Munson|date=1995|title=''Super Mario World 2: Yoshi's Island'' Player's Guide|publisher=Nintendo of America|language=en-us|page=[[media:SMW2 Guide 126.jpg|126]]}}</ref><ref>{{cite|date=January 1998|title=''[[Nintendo Power]]'' Volume 104|author=Tilden, Gail, et al.|page=16|quote=Still haunting the Yoshis, the Boo Buddies bust back onto the scene.|publisher=Nintendo of America|language=en-us}}</ref><ref>{{cite|author=Hodgson, David S J|date=October 21, 2003|title=''Super Mario Advance 4: Super Mario Bros. 3'' Prima's Official Strategy Guide|publisher=[[Prima Games]]|language=en-us|isbn=0-7615-4425-9|page=19, 35, 45, 56, 57, 66, 71, 82, 85, 97, 102, 103, 104, 121, 122, 125, and 126}}</ref> or simply '''Ghosts''',<ref>{{cite|quote=The candle in this contraption scares Ghosts into covering their eyes, so you can safely walk your Mini right through them.|url=play.nintendo.com/news-tips/tips-tricks/mini-mario-friends-amiibo-challenge-items|title=Mini Mario & Friends: amiibo Challenge Items|publisher=Play Nintendo|language=en-us|accessdate=March 31, 2020|archive=web.archive.org/web/20200816215214/https://play.nintendo.com/news-tips/tips-tricks/mini-mario-friends-amiibo-challenge-items}}</ref> are recurring ghost enemies that first appear in ''[[Super Mario Bros. 3]]''. They are a type of white spherical ghost with menacing and normally open mouths. They are known for their large tongues and small stubby arms. However, the most distinctive characteristic of the Boos is their shy personality, as they cover their faces when someone looks directly at them, but then uncover and move after the character when their back is turned; this exact behavior is used by {{iw|wikirby|Mumbies}} in the ''{{iw|wikirby|Kirby (series)|Kirby}}'' series.

"Boo" Diddlys<ref>{{cite|date=1990|title=''Super Mario Bros. 3'' instruction booklet|publisher=Nintendo of America|language=en-us|page=38}}</ref> appear in ''Super Mario Bros. 3''. They are first encountered in {{world link|2|fort|World 2-Fortress}}, and are largely found in fortress stages, though are not exclusive to them. A "Boo" Diddly shields its face if looked at, but chases the player character if not looked at. "Boo" Diddlys can be defeated only from either the effects of a [[Hammer Suit]] or a [[Super Star|Starman]], or from a [[Koopa Shell|Koopa shell]]. "Boo" Diddlys are depicted with either a dark-blue or dark-red outline in the [[Family Computer]] and [[Nintendo Entertainment System]] version, depending on the level.

"Boo" Buddies (called "Boo" Diddlys earlier in development)<ref>{{cite|author=TCRF|title=[[tcrf:Development:Super Mario World (SNES)/Background Graphics and Tilemaps/Credits#Enemy Cast List|Development:Super Mario World (SNES)/Background Graphics and Tilemaps/Credits § Enemy Cast List]]|publisher=The Cutting Room Floor|language=en|accessdate=August 6, 2020}}</ref> appear in ''[[Super Mario World]]'' and [[Super Mario World: Super Mario Advance 2|its reissue]]. They are solely encountered in the [[Ghost House]] levels. "Boo" Buddies behave identically but move slower than before, a consistency retained throughout the [[Super Mario (series)|''Super Mario'' series]]. "Boo" Buddies appear to have multiple tails. "Boo" Buddies change their face very briefly if looked at for long enough, and groups of them make a variety of facial expressions. More varieties are introduced in the game, including [[Block Boo|Boo Buddy Block]]s, [[Boo Buddy Snake]]s, [[Boo Crew]]s, [[Boo Buddies|Circling Boo Buddies]], [[Eerie]]s, [[Disappearing Boo Buddy|Disappearing Boo Buddies]], and the [[Big Boo]], though Stretches are absent. A "Boo" Buddy is defeated only from the effects of [[Super Star]]s or being hit by a [[Grab Block]].

Boo Buddies appear in the [[Pumpkin Zone]] levels of ''[[Super Mario Land 2: 6 Golden Coins]]'', in addition to their introduced [[Ghost Goomba]] variants. Boo Buddies move in a slower, wave-like pattern than before. They can be defeated by a [[Koopa Shell]].

Boos (also called '''Baby Boos''')<ref>{{cite|author=Prima Bath|date=April 7, 1999|title=''Nintendo 64 Game Secrets, 1999 Edition'' Prima's Official Strategy Guide|publisher=Prima Games|isbn=0-7615-2103-8|page=84-87}}</ref> appear in ''[[Super Mario 64]]'' and ''[[Super Mario 64 DS]]''. They use their design from ''[[Mario Party 4]]'' in the latter version. Boos are encountered in the [[Courtyard (Peach's Castle)|courtyard]] of [[Peach's Castle]] and in [[Big Boo's Haunt]]. Big Boos are recurring mini-bosses in the latter location, as well as a different [[King Boo|Big Boo]] in the [[Big Boo Battle]] stage in the remake only. When Boos are looked at, they become partially visible, but are fully opaque otherwise and follow the player character. Boos take away two units of [[Health Meter|health]] on contact. The Boos in the courtyard hold a [[coin|Yellow Coin]] each, and those in Big Boo's Haunt each have a [[Blue Coin]]; the remake changes the former instance to [[Red Coin]]s until the player collects all eight and then the [[Power Star]]. Boos are defeated from either a [[punch]], a [[kick]], a [[Ground Pound|Pound the Ground]] attack, or [[Luigi]]'s [[Spin Jump|spin jump]] in the remake only. Boos cannot be defeated by [[Yoshi]] in the remake, and it is spit out if Yoshi attempts to do so.<ref>{{cite|quote=You...can't...EAT...ghosts! Eee hee hee!|author=Boo|date=2004|title=''Super Mario 64 DS''|publisher=Nintendo|language=en}}</ref> A line of dialogue displays each time a Boo is defeated in the [[Go on a Ghost Hunt|first mission]] of Big Boo's Haunt.<ref>{{cite|quote=Ghosts...don't...DIE! Heh, heh, heh! Can you get out of here...alive?|author=Boo|date=1996|title=''Super Mario 64''|location=Big Boo's Haunt|publisher=Nintendo|language=en}}</ref> A Big Boo appears in the hallway of the Mushroom Castle after twelve Stars are collected, or 15 in the remake, while the remake additionally features a normal Boo in the same position after eight Stars are collected, disappearing if the eight [[Red Coin]]s in the courtyard are collected and being replaced with the Big Boo either way once 15 are collected. In several missions of the remake, a Boo wearing a [[Luigi Cap|Luigi's cap]] appears in the stage.

Boos appear in ''[[Super Mario Bros. Deluxe]]''. They are competitors in the "You VS. Boo" mode, competing to reach the [[Goal Pole|flagpole]] before the player can. Boos do not damage the player character on contact. If the Boo is defeated within a time frame, it flies away, being replaced by a faster green Boo, then by a faster red Boo, and lastly a '''Black Boo'''<ref>{{cite|date=1999|title=''Super Mario Bros. Deluxe'' instruction booklet|publisher=Nintendo of America|language=en-us|page=20}}</ref> with a yellow outline. The Black Boo travels in a way mimicking the player's best time.

Boos return in ''[[Super Mario Sunshine]]''. They have a different design consisting of drooping eyelids, blue circles around their black pupils, and long, coiled tails, due to being made of [[goop]].<ref>{{cite|author=Sakai, Kazuya (Ambit), et al.|date=October 19, 2015|title=『スーパーマリオブラザーズ百科: 任天堂公式ガイドブック』 (''Super Mario Bros. Hyakka: Nintendo Kōshiki Guidebook'')|publisher=[[Shogakukan]]|language=ja|location=Tokyo|isbn=978-4-09-106569-8|page=107}}</ref> They are encountered in [[Sirena Beach]] only, inside of [[Hotel Delfino]]. Two varieties of Boo appear, [[Block Boo|Pink Boo]]s and [[Sleepy Boo]]s, and the boss fought below Hotel Delfino is [[Big Boo (character)|King Boo]]. Boos move around in slow, swooping motions. They do not react if looked at. There are Boos that are mostly invisible, besides a distorted visual effect, but spraying them with water makes them become increasingly visible. The invisible Boos take on disguises such as Yellow Coins or Blue Coins, differentiated only from not spinning at a constant pace, or [[Shadow Mario]], differentiated by appearing lighter colored, lacking the [[magic brush]], and the Shadow Mario theme not playing. If a disguised Boo is approached, it laughs and bumps into Mario, unless it has been sprayed prior.

Boos appear in ''[[Super Mario Galaxy]]''. Normally, Boos become transparent when the player character looks at them but are opaque and go after the player character if they are not looking. There is also an underwater type that simple floats back-and-forth a short distance oblivious to the player character. A Boo can be defeated mainly from any ray of light or when touched by [[Rainbow Mario]]. Boos can be spun off course from a spin attack. Varieties that appear include [[Big Boo|Atomic Boo]] and the debuting [[Bomb Boo]]s, and there is an Atomic Boo character who is raced, the [[Spooky Speedster]]. One of the power-ups, [[Boo Mario]], has the player character become a Boo, retaining only his face and cap. Boos are attracted to Boo Mario and follow him. If a Boo hits Boo Mario, he does not take damage but does lose the power-up.

Boos appear in ''[[Super Mario Galaxy 2]]''. They behave identically to their appearance in ''Super Mario Galaxy'', with both the normal and underwater types reappearing. Besides Bomb Boos returning, two variants make their debut: [[Octoboo]]s, a cross between an [[Octoomba]] and Boo, and [[Mega Boo]]s, larger than even Big Boos.

Boos are course elements in ''[[Super Mario Maker]]'', [[Super Mario Maker for Nintendo 3DS|its port]], and ''[[Super Mario Maker 2]]''. They have newly designed sprites for the ''[[Super Mario Bros.]]'' style, but are otherwise the same as in other entries of the ''Super Mario'' series. Boos can be inserted into [[Bill Blaster]]s, [[Block]]s, a [[Koopa Clown Car]], [[track]]s, or [[Warp Pipe]]s. Boos can be shaken to become [[Boo Buddies]] or dragged on to platforms to become [[Stretch]]es. Applying a [[Super Mushroom]] to a Boo changes it into a Big Boo, while giving it wings gives it faster movement. Boos in Koopa Clown Cars affect the vehicle to stop and close its eyes when looked at and sneak up on the player while they are not looking. In ''Super Mario Maker 2'', Peepas also appear in the ''Super Mario 3D World'' style, replacing Boo Buddies.

Two Boo Diddlys appear in "[[Misadventures in Babysitting]]", where they are found in the dungeon sneaking behind and spooking [[Junior (The Adventures of Super Mario Bros. 3)|Junior]]. The same Boos are scared off by Luigi who makes a scary face at them. They are seen once more fleeing from lava caused by [[Ludwig|Kooky]]. In the episode, the Boos have deep, menacing laughs but high-pitched screams.

Boo Buddies are one of six types of falling objects in ''[[Yoshi (game)|Yoshi]]''. They are based on their appearance in ''[[Super Mario World]]''.

'''Ghosts'''<ref>{{cite|date=1992|title=''Super Mario Kart'' instruction booklet|publisher=Nintendo of America|language=en|page=14}}</ref> are items in "2 Player" mode and background elements of [[SNES Ghost Valley 1|Ghost Valley 1]] [[SNES Ghost Valley 2|Ghost Valley 2]], and [[Ghost Valley 3]] in ''[[Super Mario Kart]]''. Using a Ghost item makes the user become transparent temporarily as the Ghost steals any item available from an opponent. Ghosts in the background laugh as the player character drives by.

Boos (named '''Ghost Bonuses''' on one occasion)<ref>{{cite|date=April 1997|title=''Nintendo Magazine System'' (AU) Issue 49|publisher=Catalyst Publishing|language=en-au|page={{file link|NMS Australia 49 MK64 drivers and items.jpg|39}}}}</ref> are items as well as background elements of [[N64 Banshee Boardwalk|Banshee Boardwalk]] and [[N64 Rainbow Road|Rainbow Road]] in ''[[Mario Kart 64]]''. Boos can be obtained by racers in one of the top two positions. When used, a Boo makes the user both invisible and invincible temporarily as it selects an opponent to steal an item from, unless the racers have no items. A player character affected by a Boo can pass any items, course obstacles, and racers by going through them. The CPUs also use Boos, but they do not steal items.

Boos, also named "ghosts",<ref>{{cite|author=Walsh, Doug|date=August 21, 2001|title=''Mario Kart: Super Circuit'' Official Racing Guide|publisher=BradyGames|language=en-us|isbn=0-7440-0091-2|page=92}}</ref> are items, background characters in [[GBA Boo Lake|Boo Lake]], and obstacles in [[Broken Pier]] in ''[[Mario Kart: Super Circuit]]''. When used as an item, the Boo makes the user invisible for about five seconds and slows down the leading racer. A CPU can now use a Boo to potentially steal the player's item and coins. The transparency effect lasts for five seconds. The Boos in Boo Lake hold candles to guide player characters, while the Boos on Broken Pier take the coins

Boos, named '''Boo Hoo''' in British English,<ref>{{cite|date=2005|title=''Mario Kart DS'' European English instruction manual|url=cdn02.nintendo-europe.com/media/downloads/games_8/emanuals/nintendo_ds_21/Manual_NintendoDS_MarioKartDS_EN.pdf|format=PDF|publisher=Nintendo|language=en-gb|page=12}}</ref> are items, background characters in {{classic link|N64|Banshee Boardwalk}}, and cameo in portraits in [[DS Luigi's Mansion|Luigi's Mansion]] in ''[[Mario Kart DS]]''. When used, a Boo makes the user partly invisible while stealing an item from the nearest racer. Using a Boo item does not slow the user while on offroad surfaces. Boos are obtainable by racers between 3rd to 7th place. The Boos in {{classic link|N64|Banshee Boardwalk}} only let out a laugh as a player character drives by.

Boos are background characters in the course {{classic link|SNES|Ghost Valley 2}} and cameo in [[Bowser's Castle (Mario Kart Wii)|Bowser's Castle]] in ''[[Mario Kart Wii]]''. In the former, they only laugh as racers drive by before disappearing eventually, while in the latter, artwork of Boo and [[Dry Bones]] from ''[[Mario Party 7]]'' is shown. King Boo has a much larger role again as a playable character.

Boos are background characters of the course {{classic link|DS|Luigi's Mansion}} and spectators on [[3DS Toad Circuit|Toad Circuit]] and {{classic link|N64|Luigi Raceway}} in ''[[Mario Kart 7]]''. The Boo portraits in {{classic|DS|Luigi's Mansion}} replace every portrait ghost portrait, and they push against their paintings as player characters drive nearby.

Boos are obstacles in the course [[Twisted Mansion]] in ''[[Mario Kart 8]]'' and ''[[Mario Kart 8 Deluxe]]'' as well as items in the latter. The Boos near the gliding section of Twisted Mansion can be landed on, and the course also has [[Hammer Knight]]s towards the end. Boos also float around in {{classic link|GCN|Luigi's Mansion}} in ''Mario Kart 8 Deluxe'' and {{classic link|GBA|Boo Lake}} in the ''[[Mario Kart 8 Deluxe – Booster Course Pass]]'', replacing candle Boos from the original iteration in the latter course.

As items, Boos steal an item from a random opponent in front of the user, even if they are under invincibility effects. They can no longer be used to take off-road shortcuts. If there is no item to steal, the Boo gives the user a Mushroom. Only one Boo can be used on a course at once, excluding if an opponent is still under invisibility effects. A Boo can steal any timed or multiple usage item, except for a [[Crazy Eight]], [[Piranha Plant]], or [[Bullet Bill]], and the duration or usage is not carried over to the player character.<ref>{{cite|author=Mankalor|date=May 8, 2017|url=youtu.be/OUdaqb7Cj2I|title=Mario Kart 8 Deluxe Tips - Boo Item Analysis|publisher=YouTube|accessdate=May 9, 2017}}</ref>

Boos<ref>{{cite|date=1993|title=''Yoshi no Road Hunting'' instruction booklet|publisher=Nintendo|language=ja|page=21}}</ref> (misnamed "Big Boo" in the English manual)<ref>{{cite|date=1993|title=''Yoshi's Safari'' instruction booklet|publisher=Nintendo of America|language=en-us|page=20}}</ref> are enemies in ''[[Yoshi's Safari]]'', where they are encountered only in [[Ghost Mansion]]. Unlike most enemies in the game that can be shot with the [[Super Scope]] to be defeated, shooting a Boo stops it in its tracks. While stunned, [[Yoshi]] can then run into it to defeat it. Defeating a Boo adds 500 points to the player's score (1,000 in Hard Mode), the highest amount of points earned from regular enemies. A [[Big Boo]] serves as the boss for the level.

Boos<ref>{{cite|date=1995|title=マリオクラッシュ (''Mario Kurasshu'') instruction booklet|publisher=Nintendo|language=ja|page=20}}</ref> (misnamed "Big Boo" in the English manual<ref name=ClashBoo>{{cite|date=1995|title=''Mario Clash'' instruction booklet|publisher=Nintendo of America|language=en-us|page=21}}</ref>) are enemies in ''[[Mario Clash]]''. Boos can become transparent and therefore invulnerable, but while opaque, Boos are vulnerable to being defeated by a [[Koopa Shell|Turtle Shell]]. Boos are referred to by feminine pronouns in localized manuals.<ref name=ClashBoo/>

'''Boo Buddies'''<ref>{{cite|date=1994|title=''Hotel Mario'' instruction book|page=16}}</ref> are enemies in ''[[Hotel Mario]]''. Besides behaving similarly as in the platforming games, Boos wander diagonally while the player character is in an elevator. Some other Boos are normally transparent and wander in a similar manner, regardless of where the player character is looking, and sometimes become visible and quickly charge at him.

Boos return during the events of ''[[Super Mario RPG: Legend of the Seven Stars]]'' and [[Super Mario RPG (Nintendo Switch)|its remake]]. They are misnamed as "The Big Boo" in the original English translation, whereas the remake matches their usual Japanese name and simply calls them Boos. These Boos, like other Boos that appear in previous games, hide behind their arms when stared at. However, some Boos teleport around the room, attempting to scare Mario and his friends. Boos live in [[Kero Sewers]] along with many other ghouls, including [[Hobgoblin]]s and [[Shadow (enemy)|Shadows]]. Often, these three undead monsters will assist each other in battle. Boos have no physical defense, making them extremely weak enemies (for reference, a [[Goomba]] is the weakest enemy encountered and it has three defense points). However, Boos make up for their lack of defense with high evasion, meaning that most attacks against Boos will miss. In battle, Boos command powerful lightning magic, including the attacks [[Lightning Orb]] and [[Bolt (move)|Bolt]]. Boos also know the special attack [[Scream]], which cuts a party member's [[fear|attack and defense in half]]. When not using magic, Boos approach one of Mario's party members and make a face, damaging that character. In this game, there is also a stronger Boo variation called [[High Boo]]s, which are the same size as their normal counterparts but have blue tongues, similar to the first appearance of [[King Boo]]. The only true appearance of a Big Boo in this game is the one used in [[Bowser]]'s [[Terrorize]] attack.<ref>{{cite|date=1996|title=''Super Mario RPG: Legend of the Seven Stars'' instruction booklet|publisher=Nintendo of America|language=en|page=41}}</ref> One Boo lives in [[Monstro Town]] as part of the [[Three Musty Fears]].

Ghosts<ref>{{cite|quote=You'll lose points by clicking on Goombahs, Ghosts, or Bowser -- especially Bowser.|date=March 14, 1997|title=''Mario Net Quest''|author=How to Play dialogue|publisher=IBM}}</ref> are obstacles in ''[[Mario Net Quest]]'' that cost the player 1,500 if clicked on.  

The normal Boo<ref>{{cite|date=February 20, 1998|title=「ヨッシーストーリー 任天堂公式ガイドブック」 (''Yoshi's Story Nintendo Kōshiki Guidebook'')|publisher=Shogakukan|language=ja|isbn=4-09-102619-2|page={{file link|Yoshi Story Shogakukan P7.jpg|7}}}}</ref> is misnamed as a Big Boo<ref>{{cite|author=Leung, Jason, Terry Munson, and Scott Pelland|date=1998|title=''Yoshi's Story'' Player's Guide|publisher=Nintendo Power|language=en-us|page=10}}</ref> in the ''[[Nintendo Power]]'' guide.

Boos are non-playable characters in ''[[Mario Party Advance]]''. Four of them haunt [[Boo Cemetery]]. They mention a crime when [[Shroomlock]] appears to assist them, shortly after the player's arrival. At the mention of a theft, the Boos worriedly ask for help to find the [[golden Boo statue]], which they consider a symbol of their friendship. The Boos find that there are four of them instead of the usual three.<ref>{{cite|quote=That's right! We three Boos are best--|author=Boo|date=2005|title=''Mario Party Advance''|publisher=Nintendo|language=en}}</ref><ref>{{cite|quote=When did we pick up a fourth?|author=Boo|date=2005|title=''Mario Party Advance''|publisher=Nintendo|language=en}}</ref> When the Boo with a slightly moveset and rhythm is selected by the player, the false Boo is revealed to be [[Koopa Kid]], who escapes, leaving behind the statue, and the Boos give the player the [[Predictotron]] as a reward. The Boos are said to haunt [[Horror Condo]] regularly in the epilogue.

Boo is a playable character in ''[[Mario Party 7]]''. It is partnered with [[Dry Bones]]. Red Boos have similar roles as in ''Mario Party 6'' since Boo is playable. Boo's special orb, shared with Dry Bones, is the [[Magic Orb]], which doubles their dice roll and grants temporary invisibility and invulnerability to traps for the next two turns.

Boo is a playable character in ''[[Mario Party 8]]''. Its partner is Dry Bones again. Red Boos take the role of the Boo species once more. [[King Boo]] hosts one of the boards, [[King Boo's Haunted Hideaway]].

In ''[[Super Mario Party Jamboree]]'', Boo returns as a playable character and a board element, retaining the latter's function from ''Mario Party Superstars''. This is the first game that Boo appears in a playable and non-playable capacity, unlike other games that used other characters for stealing functionalities. If the playable Boo meets the non-playable Boo, the latter will say "Wah! It's like looking into a mirror..."<ref>{{cite|author=God is a Geek|date=September 9, 2024|url=youtu.be/f623bkogUO0?t=466|title=Super Mario Party Jamboree is the biggest entry in the series yet {{!}} Hands-on preview|timestamp=07:46|publisher=YouTube|language=en|accessdate=September 9, 2024}}</ref> and if the latter steals from the former, the latter will say, "Kinda weird, but fun!"

Boos return as enemies in ''[[Super Paper Mario]]''. They become invisible if looked at, but if they are not looked at, Boos become opaque and pursue the player character Boos can be defeated by attacking them from behind. Boos, Dark Boos, and Atomic Boos are all featured in the minigame [[Mansion Patrol]], where the goal is to shoot them for points. After being saved from a Boo, a [[Toad (species)|Toad]] often appears to give power-ups. Lady Bow also makes three cameos.

====''Luigi's Mansion: Dark Moon'' / ''Luigi's Mansion 2 HD''====

Boos are enemies in ''[[Luigi's Mansion: Dark Moon]]'' and ''[[Luigi's Mansion 2 HD]]''. There are a total of [[List of Boos in Luigi's Mansion: Dark Moon|32 Boos]], all serving [[King Boo]], who returns as the main antagonist; ten of the Boos merge into the [[Big Boo]] fought in the [[Treacherous Mansion]]. The regular Boos all have names that play on "Boo," like in the previous game. Every mission has a Boo hidden in an invisible object that can be revealed only from using the [[Dark-Light Device]]. Once all five Boos are caught in a mansion, a bonus mission for it is unlocked. Boos can create [[Spirit Ball]]s, which make objects invisible, and appear from certain ones only after [[Luigi]] has vacuumed all of them in. A Boo is captured by pulling back on its tongue using the [[Poltergust 5000]] and releasing it by pressing {{button|3ds|A}}, damaging the Boo as it bounces around the room. When it reaches 0 [[Heart Point|HP]], the Boo can be forced into the Poltergust 5000 when attached to the nozzle and shoved inside by Luigi. All captured Boos are located in the Boo Canister in the [[E. Gadd's Vault#Boo Canister|Vault]], each being sent down there after Luigi returns to the [[Lab|Bunker]] from a mission.

In the [[Super Smash Bros. (series)|''Super Smash Bros.'' series]], Boos mostly appear in the form of collectible items. In ''[[Super Smash Bros. Melee]]'', a Boo appears as a collectible [[Trophy (Super Smash Bros.)|trophy]]. In ''[[Super Smash Bros. Brawl]]'', there is another trophy of Boo, as well as a [[Sticker (Super Smash Bros. Brawl)|sticker]] depicting its artwork from ''Mario Tennis''. In both ''[[Super Smash Bros. for Nintendo 3DS]]'' and ''[[Super Smash Bros. for Wii U]]'', Boos once again received their own collectible trophy; furthermore, ''Super Smash Bros. for Wii U'' gave one an item in {{iw|smashwiki|Smash Tour}}, where using it allows the player to begin a battle while invincible. In ''[[Super Smash Bros. Ultimate]]'', there is a Novice-class Neutral-type primary [[Spirit (Super Smash Bros. Ultimate)|spirit]] of a Boo, using its artwork from ''[[New Super Mario Bros. U]]'', and it can be enhanced to [[King Boo]] at level 99. In [[smashwiki:Adventure Mode: World of Light|World of Light]], the Boo spirit appears in the [[smashwiki:Dracula's Castle (World of Light)|Dracula's Castle]] sub-world of the {{iw|smashwiki|Dark Realm}}. The spirit battle takes place on the [[Mushroom Kingdom U]] stage, with an invisible grayscale [[Kirby]] as the puppet fighter.

Boos appear in the [[Mario Clash (microgame)|Mario Clash]] microgame in ''[[WarioWare, Inc.: Mega Microgame$!]]'' and ''[[WarioWare Gold]]'', exclusively in the second level. The only other microgame they appear in is [[Boo (microgame)|Boo]] in ''[[WarioWare: D.I.Y. Showcase]]'', which involves starting at both Boos without touching them.<ref>{{cite|quote=Keep the Boos at bay. By looking.|date=2009|author=In-game instructions|title=''[[WarioWare: D.I.Y. Showcase]]''|publisher=Nintendo|language=en}}</ref>

Boos are enemies exclusive to [[Bowser's Castle]] in ''[[Mario & Luigi: Superstar Saga]]''. As usual, Boos hover in Mario and Luigi's direction when they are faced away but look away if they are looked at. For its turn, if a Boo makes a face, it targets Luigi, but goes after Mario otherwise. During battle, the Boo can attack by either teleporting in front of Mario or Luigi and to try and bite him or by flying up and swooping at him, possibly [[Prohibited Command|prohibiting the use of certain moves or items]]. The former attack can be countered with a [[hammer]] and the latter dodged or countered with a jump. Boos are weak to [[Firebrand]] and [[Fire Bros. (move)|Fire Bros.]] Boos have low HP but very high defense.

Boos are in levels 4 and 5 of [[Mysterious Mine Carts]] (levels 3 and 5 in the remake). They wear mining helmets and brandishing pickaxes. If they touch Mario, he loses a diamond. Boos slowly shrink until disappearing by pointing a flashlight at them.

There are also [[Boo Statue]]s which become invisible and cannot be interacted with when looked directly at. Mario and Luigi must use the [[Tickle]] move to push them while facing backward.

 

The [[Boo Biscuit]] item appears only in the [[Mario & Luigi: Superstar Saga + Bowser's Minions|remake]]. Additionally, for the ''[[Minion Quest: The Search for Bowser]]'' mode, Boos appear as flying troopers. Their evasion can be increased from their [[Special Skill (Mario & Luigi series)|Special Skill]], Evasion Cloak, based on how much the corresponding meter is filled. Boos attack by ramming into enemies. [[Captain Boo]] is also a playable caption, and Big Boo and [[Tail Boo]] also return. As a captain, Boo can attack the other captain from behind, using [[Sneak Attack]].

During the events of ''[[Mario & Luigi: Partners in Time]]'', Boos appear in [[Bowser's Castle (Mario & Luigi: Partners in Time)|Bowser's Castle]] of the past. Their [[Dark Boo]] varieties also appear, in the [[Gritzy Caves]]. Outside of battle, Boos behave the same as before, though they behave differently in battle. Before attacking, Boo chooses target either Mario if its right eye is pointed at him or at Luigi with its left eye.<ref>{{cite|quote=If he opens his right eye he’ll attack Mario: an open left eye means Luigi will be the target.|author=Hoffman, Chris|date=November 18, 2005|title=''Mario & Luigi: Partners in Time'' Player's Guide|publisher=Nintendo of America|language=en-us|isbn=1-59812-006-9|page=19}}</ref> Afterward, Boo appears behind its target and charges, although its attack can be either dodged or countered with a jump. While battling [[Sunnycide]], if it is on its back, Sunnycide can summon a Boo to attack Mario or Luigi,<ref>{{cite|quote=When the Yoshis knock Sunnycide on its back, it'll sometimes turn out the lights and send out a Boo.|author=Hoffman, et al.|title=''Mario & Luigi: Partners in Time'' Player's Guide|language=en-us|page=42}}</ref> who can counter using their hammer. While battling a [[Handfake]], if it has a [[Bowser]] sign, either Boo or a [[Fly Guy]] carries a flame from Bowser's mouth.

Boos appear in [[Bowser's Castle]] in ''[[Mario & Luigi: Bowser's Inside Story]]''. They and the rest of [[Bowser's Minions|Bowser's minions]] have served Fawful ever since he took over the castle. One of the Boos is shown to be in love with a [[Koopa Troopa]] and vice versa if spoken to. Three Boos later force-feed Bowser lots of food after he defeats [[Midbus]], followed by Bowser becoming trapped in floor from his weight. Later on, Boos are among the brainwashed minions who push the Fawful statue against Bowser. When Bowser levels up, a Boo is shown holding the circle when choosing a bonus stat upgrade.

During the fight with [[Bowser Memory M and Bowser Memory L]], the latter has an attack of being chased around by a digital Boo. The Boo can be jumped on by either brother to stop the attack prematurely.

Boos return in [[Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey|the remake]], as well as Boo Biscuits, which are not in the base game. Additionally, they are enemies and recruitable allies in the ''[[Bowser Jr.'s Journey]]'' mode. Their Special Skill is Discord, which [[SPD-Down|lowers the speed]] of enemies. Captain Boo also returns as well as Big Boo and Tail Boo.

Boos are featured in a minigame of ''[[Mario & Luigi: Paper Jam]]'' where the player has run from a Boo while avoiding firebars and bombs to save a Toad. Boos retain their usual trait of pursuing while not looked at but covering their face if they are. Boos are also seen carrying Papercraft Boos, along with Papercraft King Boo. Boos also have [[Paper Boo|paper counterparts]], which are encountered in [[Gloomy Woods]], as well as [[King Boo]]. Boo Biscuits also return from ''Mario & Luigi: Dream Team''.

Boos appear in ''[[Mario & Luigi: Brothership]]'' as enemies in Bowser's Castle. In battle, Boos form into Boo Buddies and circle above a bro. while slowly descending, similar to [[Paper Boo|their paper counterparts]] in the previous game. The bro must jump on at least one Boo to end the attack. Boos can also create clones and each move towards the bros. The clones disappear before reaching the bros. but the real Boos must be countered with the hammer. A Boo is of Level 32. [[Boo Biscuit|Boo Biscuits]] also reappear, serving the same purpose as before and can be used in the fight against the [[Extension Corps]] to negate the effects of their [[Battle Plug]] at the end of the fight.

 

 

A [[Glohm]]-contaminated version of the Boo can be found later in the game, inside the hanger of the fortress [[Bowser]] and his army set up on [[Wayaway Island]]. These "[[Glohm Boo]]s" become more numerous when [[Reclusa]] goes on a rampage after being resurrected by [[Zokket]], and explode in a wave of fire that must be avoided when defeated.

In the [[Mario & Sonic (series)|''Mario & Sonic'' series]], Boos mainly appear in a few events, sometimes also as audience members. In the [[Wii]] version of ''[[Mario & Sonic at the Olympic Games (Wii)|Mario & Sonic at the Olympic Games]]'', Boos appear as an item in [[Dream Race (Mario & Sonic at the Olympic Games for Wii)|Dream Race]], where they temporarily follow whoever is in first place, or second if the player in the lead uses it, causing them to lose speed. It is possible for multiple Boos to follow a character at once, causing them to remain at a lower speed, but a [[High Speed]] item can remove them. In the [[Mario & Sonic at the Olympic Games (Nintendo DS)|Nintendo DS version]], Boos penalize the player if they perform two consecutive fouls in the [[100m (Mario & Sonic at the Olympic Games for Nintendo DS)|100m]], [[400m (Mario & Sonic at the Olympic Games for Nintendo DS)|400m]] or [[400m Hurdles (Mario & Sonic at the Olympic Games for Nintendo DS)|400m Hurdles]] events, and in [[Dream Basketball]], a Boo blocks one of the baskets if a [[Chaos Emerald]] is used. Both versions of ''Mario & Sonic at the Olympic Games'' include Boos as part of the audience in various events. In the Nintendo DS version of ''[[Mario & Sonic at the Olympic Winter Games (Nintendo DS)|Mario & Sonic at the Olympic Winter Games]]'', Boos are items in three events: [[Ski Cross Racing]], where they can steal [[Ring (Sonic the Hedgehog)|Rings]] and items from players ahead of the user; [[Extreme Snowboarding]], where Boos steal items from opponents in front and deplete the energy in their trick gauge; and [[Ski Shooting]], where Boos will simply steal an item from an opponent if they have any. In the Nintendo 3DS version of ''[[Mario & Sonic at the Rio 2016 Olympic Games (Nintendo 3DS)|Mario & Sonic at the Rio 2016 Olympic Games]]'', Boos appear in [[Archery Plus]], where they carry around the targets and disappear upon being shot.

Boo is a playable character in ''[[Mario Sports Superstars]]''. This Boo is a starter captain-type who is billed a Technique player, giving it an advantage in accuracy or horse control, except in tennis, which bills it a Tricky type. Boo's rallies curve in tennis, making the trajectory of its shots less predictable. Boo has a default drive of 213 yards and shots that travel medium-low in a draw trajectory in golf.

Additionally, in the Super Mario Mash-Up Pack in ''[[Minecraft]]'', Ghasts are replaced by Boos.

Boos [[List of Super Mario Odyssey pre-release and unused content|were going to appear physically]] in ''[[Super Mario Odyssey]]'', as one is seen in concept art for the game, but they were removed from the game,<ref>{{cite|author=Brian|date=October 3, 2018|title=New Super Mario Odyssey concept art shows a ton of scrapped costume ideas|url=nintendoeverything.com/new-super-mario-odyssey-concept-art-shows-a-ton-of-scrapped-costume-ideas/|publisher=Nintendo Everything|language=en}}</ref> making this game the first game in the ''Super Mario'' series to not contain Boos since ''[[Super Mario Land]]''. However, [[Princess Peach|Peach]] wears a Boo mask on the side of her head when she visits [[Bowser's Kingdom]], a common way to wear masks of ''{{wp|yōkai}}'' in festivals in Japan.

Boos were planned to appear in the film, as they can be seen in early concept artwork for the [[Dark Land]]s, but they were removed from the final release.<ref>{{cite|author=GameXplain|date=April 23, 2023|title=Toadsworth & Toadette were in the Super Mario Bros. Movie?! Concept Art LEAK Reveals Cuts & Changes|url=www.youtube.com/watch?v=b2KZXJg3ncA|publisher=YouTube|language=en|accessdate=April 23, 2023}}</ref> However, their leader, [[King Boo]], makes an appearance during the wedding between [[Bowser]] and [[Princess Peach|Peach]].

{{:Super Mario RPG (Nintendo Switch) bestiary|transcludesection=Boo}}

|Jpn=テレサ<ref>{{cite|author=Shogakukan editors|date=2006|title=「敵キャラクターリスト」in『ニュー・スーパーマリオブラザーズ: 任天堂公式ガイドブック』|url=i.imgur.com/rilbHbm.jpg|language=ja|location=Tokyo|publisher=Shogakukan|isbn=4-091063-07-1|page=18}}</ref><ref> [[:File:Card 37.jpg|''Super Mario RPG'' trading card]] </ref>

|JpnR=Teresa

|JpnM=From「{{ruby|照|て}}れ{{ruby|屋|や}}」(''tere-ya'', a very shy person) and possibly「~さ」(''-sa'', a nominalizing suffix meaning "-ness") Romanized in ''Super Mario World'' as "''Telesa''".

|Jpn2=テレサ（{{ruby|小|しょう}}）

|Jpn2N=''Yoshi's Island DS''

|Jpn2R=Teresa (Shō)

|Jpn2M="Boo (Small)", in comparison to [[Big Boo]]

|Jpn2C=<ref>{{cite|quote=「テレサ（{{ruby|大|だい}}・{{ruby|小|しょう}}）」|date=April 11, 2007|title=「ヨッシーアイランドDS任天堂公式ガイドブック」 (''Yoshi's Island DS Nintendo Kōshiki Guidebook'')|publisher=Shogakukan|language=ja|isbn=978-4-09-106361-8|page={{file link|YIDS Shogakukan P22.jpg|22}}}}</ref>

|ChiS2C=<ref>{{cite|author=无敌阿尔宙斯|date=August 28, 2013|deadlink=y|archive=web.archive.org/web/20170227153847/http://tieba.baidu.com/p/2560204606|title=神游 超级马力欧世界 敌人官译|publisher=Baidu Tieba|language=zh-hans|accessdate=July 27, 2024}}</ref>

|Ger2=Buu-Baby<ref>{{cite|author=Menold, Marcus, Claude M. Moyse, and Andreas G. Kämmerer, editors|date=1993|title=''Der offizielle Nintendo Spieleberater "Super Mario World"''|location=Großostheim|publisher=[[Nintendo|Nintendo of Europe GmbH]]|language=de|page=19}}</ref>

|ItaC=<ref>{{cite|title=''Super Mario Bros. 3'' Italian instruction booklet|url=www.mariocastle.it/risorse/manuali/super-mario-bros-3/39.jpg|format=JPG|publisher=Nintendo|language=it|page=38}}</ref>

|RomC=<ref>{{cite|date=May 20, 2015|url=ok.ru/videoembed/26892634756|title="Reign Storm", dubbed in Romanian by KidsCo|publisher=Odnoklassniki (OK.ru)|language=ro|accessdate=May 24, 2024}}</ref>

|Rom3C=<ref>{{file link|McDonaldsRomania2016Banner.jpg|McDonald's Romania, Summer 2016 Happy Meal promotion}}</ref>