Mario Kart Racing Wiki
Mario Kart Racing Wiki
Starman (Mario Kart Wii).png This article is not to be confused with the replays of previous Time Trial attempts known as, Ghosts. Starman (Mario Kart Wii).png
Starman (Mario Kart Wii).png This article is not to be confused with the items that steal other items, Boo. Starman (Mario Kart Wii).png

King Boo is the king of all Boos, and although he is not the biggest Boo, he is the most powerful of his kind. He is very sneaky and can summon anyone's special item in Mario Kart: Double Dash!!. He is an unlockable character in his Mario Kart debut in Mario Kart: Double Dash!! and his return Mario Kart Wii. King Boo was a playable character during a limited-time event campaign in Mario Kart Arcade GP DX held between October 18, 2017, and January 10, 2018. In the Japanese version, though, Bana Passport users could unlock him permanently by collecting three in-game stamps.

In Mario Kart DS, he is a boss in Mission Mode, and like all bosses, he came from Super Mario 64 DS, but was mistakenly called Big Boo in Super Mario 64 DS.

In Mario Kart Wii, his karts and bikes are black shaded (the same color as R.O.B.'s were in Mario Kart DS and Dry Bowser's in Mario Kart Wii). His signature vehicle is the Phantom.

Despite being an excellent handler, King Boo is a mid-tier character for his poor raising stats. King Boo is often used for courses with tight turns, such as Rainbow Road. Although in the mid-tier placing, King Boo has excellent rivalries with other characters and has excellent racing skills, making him a character with high-tier or highly possible, top-tier character categories since his handling stat raises any kart or bike, including the Spear. He was never a default playable character until Mario Kart 8 Deluxe.

King Boo - Mario Kart Wii.PNG

Unlocking Criteria


King Boo is the king of all the Boos. His body is a ghostly white color, most likely because he is a ghost. He has a round shape with two arms on either side of his body (or face, it's tough to tell), and he has a tail. He always has his mouth open in a haunting manner, so his tongue and sharp teeth can be seen quite clearly. King Boo has black eyes. So, with that being said, what makes him different from a regular Boo? To fit his role as the king of the boos, King Boo is noticeably bigger, and he has a royal golden crown with red and blue jewels encrusted in it.


Mario Kart: Double Dash!!

Mario Kart Wii

King Boo shares his karts with the other heavy characters in Mario Kart Wii.



Staff Ghost Tracks

King Boo's nature as a ghost made him the staff ghost of mainly ghost-themed tracks.

* - Retro track


  • Interestingly, King Boo is one of the heavyweight characters, despite being a floating, weightless ghost. This may mean that his crown weighs a lot or because of his large size.
  • Despite being a "weightless" heavyweight, King Boo is heavier than Wario and Waluigi, the same weight as Rosalina and slightly heavier than Dry Bowser.
  • King Boo is the only character in Mario Kart: Double Dash!! to not yell when being shot from the cannon in DK Mountain (though in Mario Kart Wii, he does).
  • It is unclear why Nintendo put King Boo in Mario Kart Wii since he's unable to drive any karts in the game due to having no arms or legs.
  • King Boo was confirmed as a returning character in Mario Kart 8 Deluxe, along with Bowser Jr. and Dry Bones.
  • He, along with Petey Piranha, can use every racer's special item in Mario Kart: Double Dash!!
  • He actually is not a racer in Mario Kart DS. However, he is a boss in the Boss Mode, where you have to defeat him.


Mario Kart: Double Dash racers
Light Baby MarioBaby LuigiToadToadetteKoopa TroopaKoopa ParatroopaDiddy KongBowser Jr.
Medium MarioLuigiPeachDaisyYoshiBirdoWaluigi
Heavy WarioDonkey KongBowserKing BooPetey Piranha
Mario Kart Wii characters
Small Baby MarioBaby LuigiBaby PeachBaby DaisyToadToadetteKoopa TroopaDry Bones
Medium MarioLuigiPeachDaisyYoshiBirdoDiddy KongBowser Jr.
Large WarioWaluigiDonkey KongBowserKing BooRosalinaFunky KongDry Bowser
Mario Kart 8 / Deluxe racers
Light Baby MarioBaby LuigiBaby PeachBaby DaisyBaby RosalinaToadToadetteKoopa TroopaShy GuyLakituLarry KoopaWendy O. KoopaLemmy KoopaIsabelle+ • Villager+ • Dry Bones* • Bowser Jr.*
Medium MarioLuigiPeachDaisyYoshiLudwig von KoopaIggy KoopaTanooki Mario+ • Cat Peach+ • Inklings*
Heavy WarioWaluigiDonkey KongRosalinaBowserRoy KoopaMorton Koopa Jr.Metal MarioPink Gold PeachLink+ • Dry Bowser+ • King Boo* • Gold Mario*
+ - denotes DLC. • * - denotes exclusivity to Mario Kart 8 Deluxe.