Big Boo's Creeps

Big Boo's Creeps are anomalous enemies found in some personalized copies of Super Mario 64, often found in levels that are considered "scary", such as Big Boo's Haunt and Big Boo's Forest. They are described as enemies with the regular Boo model but with green eyes and a green tongue. They are usually spawned by a Big Boo, but can appear in place of regular Boos, often before a Big Boo is defeated.

Big Boo's Creeps function the opposite of a regular Boo, going invisible and stopping when not looked at, and becoming solid and going towards the player while the player is looking at it. They can also teleport, similarly to Bowser in his Bowser in the Fire Sea boss fight. They are defeated by either being ground pounded while being invisible, or making a Big Boo run into them, which will make them disappear.