Boo
A Boo is a type of ghost in the Mario series. They first appeared in Super Mario Bros. 3, but in Super Mario World, there were Ghost Houses, which contained many Boos.
The Boo's Mansion in Paper Mario was a bigger version of the Ghost Houses, which had many puzzles involving Boos in it. After solving these puzzles, Bow, the princess of the Boos, joins Mario's team. In Paper Mario: The Thousand Year Door, she and Bootler are on vacation in Poshley Heights after Mario and his teammates defeat the Shadow Queen.
In Luigi's Mansion, there are 66 Boos which Luigi must suck up in his Poltergust 3000. There are 50 regular Boos, 15 others make up Boolossus, and there is also King Boo.
In the Mario Kart series, the Boo is used as an offensive and defensive item. When activated, the Boo selects a random target, steals his item and gives it to you, and then makes you invisible and invulnerable for a short period of time.
In Paper Mario: The Thousand Year Door, the Boos live in a tower called Creepy Steeple. When Mario Spin Attacks them, they merge into the Atomic Boo.
Boo appears as a playable character in Mario Party 5, Mario Party 6, Mario Party 7, Mario Golf: Toadstool Tour, Mario Superstar Baseball, and Mario Power Tennis.
Its unknown if Boos are the ghosts of formerly living beings or if they are an actual species.
Sub-Species
- Balloon Boo: A balloon-like Boo, which inflates when looked at and deflates when looked away from. Seen in New Super Mario Bros. in level 4-Ghost House.
- Dark Boo: A purple stronger Boo that's found in Poshley Sanctum.
- Stretch: A platform made of ghosts.
- Boo Man Bluff: A blindfolded Boo that moves toward your noises.
- Boo Balloon: Hit it three times with eggs to defeat it.
- Boo Blah: A ghost that moves on floors and ceilings, then pops up.
- Boo Block: A Boo that turns into a block if you look at it.
- Boo Buddy Snake: A chain of Boo's that bounce off surfaces endlessly.
- Big Blue Boo: Boss of Doughnut Plains Secret Ghost House.
- Big Boo: A huge Boo that acts the same as regular Boo's.
- Circling Boo Buddies: A circle of Boo's with a small gap to let you pass through.
- Disappearing Boo Buddies: A large group of vannishing Boo's
- Fishin' Boo: A boo that holds a fishing rod with an item, or flames, attached to the end, much like the fishin' Lakitu
Notable Boos
- Bow - Paper Mario
- Bootler - Paper Mario
- Big Boo - Super Mario World
- Bigger Boo - Yoshi's Island
- King Boo - Luigi's Mansion
- Lahla - Paper Mario: The Thousand-Year Door
- Peeka - Paper Mario: The Thousand-Year Door
- Stanley - Paper Mario
