Big Boo

Big Boos are the mini-bosses of Big Boo's Haunt. They are larger versions of Boos that take 3 hits to defeat, and contain stars. They also appear in other Boo-related courses, such as Big Boo's Forest and Ghastly Garden. In Super Mario 64 DS, there is a variant called King Boo.

Big Boo's Key
Found in the files of Super Mario 64 is an unused key object that would be found inside of a Big Boo.