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Boos (originally known as Boo Diddleys and later Boo Buddies-but sometimes mistaken for King Boos without the
BooNSMBU
crown even though there's only one 
King Boo) are common ghost enemies in the Mario series that first appear in Super Mario Bros. 3.

They are a type of white spherical ghost with menacing and constantly open mouths. They are known for their large tongues and small "arms" of some sort. However, the most distinctive characteristic of the Boos is their shy personality, where they cover their faces when someone looks them directly at the face. They will uncover their faces once the subject turns around. It is revealed in Super Mario Galaxy that they speak in Booish.

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