Boo Crew

Not to be confused with the groups of Boos from Super Mario World, also called Boo Buddies

A Boo Buddy is a miniature sub-species of Boos, known for grouping en masses to attack. They usually tend to group where other Boos may be found, such as in the Yoshi Sewers and the Ghost Castle. Boo Buddies first appeared in Yoshi's Story.

Boo Buddies appear only in Stage 2-3: Jelly Pipe as part of a Big & Little Boo and by themselves in Stage 6-3: Ghost Castle. In the Ghost Castle, Boo Buddies attack all at once in a cloud, similar to smaller versions of the Disappearing Boo Buddies from Super Mario World; however, they aren't a part of the background. Boo Buddies will stop and disappear in the same manner as a normal Boo.

Trivia

 * The term Boo Buddy has also been used sometimes to differentiate normal Boos from Big Boos.
 * Boo Buddies are named after the groups of normal-sized Boos from Super Mario World that attacked in arrangements.