|A Boo ghost laughing at his victim's fear (shutter).|
|Description||An Item that can steal another racer's Item and make the user invisible.|
|First appearance||Super Mario Kart (1992)|
|Latest appearance||Mario Kart 8 Deluxe (2017)|
A Boo, an haunting enemy in the Mario series, makes his appearance in Mario Kart series as an Item, first in Super Mario Kart, and then in Mario Kart 64, Mario Kart: Super Circuit, Mario Kart DS, and Mario Kart 8 Deluxe. The Item is also in the arcade games Mario Kart Arcade GP and Mario Kart Arcade GP 2.
Boos are also harmless (but still scary) characters that fly around in courses such as Ghost Valley 1, Ghost Valley 2, Ghost Valley 3, and Banshee Boardwalk. However, they are dangerous on the track, Broken Pier in Mario Kart: Super Circuit, because running into one will cause one to grab onto you and make you lose speed and Coins.
A Boo, probably the sneakiest Item in Mario Kart, temporarily turns the racer who is using it completely invisible to all other opponents. The player him/herself sees their Kart turn into a ghost, similar to the ones in Time Trials. While invisible, the racer can't be hit by any Items whatsoever, and they are also not hindered by driving off-road. However, they still slow down when they crash into walls (Sorry guys, no passing through walls. That'd be, like, cheating.) and you can drive off the track. But still, it is extremely convenient for cutting corners and avoiding incoming Items, making a Boo a great recovery and defensive Item.
In addition to invisibility, a Boo will go and fly off to another racer who has an Item. They can steal it, and then fly back to it and bring it to you (yeah, stealing is perfectly legal in Mario Kart)! It could be anything from a Star (great Item) or a Green Shell (an OK Item)-it just depends on whatever the other opponent have. If no one has anything, well.. too bad. No Item for you! But don't worry, Boo will still come back to say goodbye. He just won't deposit anything in your Item inventory.
Finally, exclusive to Mario Kart: Super Circuit, a Boo will do all the things mentioned above, but he also is a nice attack Item as he will fly over to the first place racer and latch on to them, slowing them down and stealing you're Coins (similar to these Shy Guys on Sunset Wilds in the same game). Too bad for the first place driver, being haunted and all.
- In the Super Mario Kart instruction booklet, Boo was called a Ghost.
- Players can actually race as a Boo, specifically the regal King Boo, in Mario Kart: Double Dash!!, Mario Kart Wii, and Mario Kart 8 Deluxe.
- Due to people hating the Boo, Nintendo removed him from Mario Kart Wii and so forth. He had a long absence of 3 games, but he will be returning in Mario Kart 8 Deluxe, and he's gonna be assumed to have the same abilities.
- Its also notable that King Boo will be a returning racer.