Mad Boo

Mad Boos are Boos that appear in Super Princess Peach. Mad Boos' behavior are the opposite of that of a regular Boo; Mad Boos do nothing when Princess Peach turns her back to them, but if she faces them, they will attack her. They also appear in a rarer Big Boo form called Mad Big Boo.

Trivia

 * In the nighttime Ground theme in Super Mario Maker 2, Boos have the same behavior as Mad Boos.

Names in other languages
Boo Furia