Boo

In Super Mario World, there are Ghost Houses, which contain many Boos. These Boos retain their usual pattern of attack from Super Mario Bros. 3 and sometimes make faces at Mario or Luigi. This game also introduces many new sub-species of Boo, the Boo Buddy Block, Boo Buddy Snake, Boo Buddy Swarm, Circling Boo Buddies, and Disappearing Boo Buddies. It also introduces a giant version of the Boo, the Big Boo, and a ghost-like Lakitu called a Fishin' Boo.