Shy Guy Wiki
Boo Guys
YI Boo Guy
Full Name Shy Guy
First Appearance Super Mario World 2: Yoshi's Island
Species Shy Guy
Affiliation(s) Baby Bowser, Koopa Troop
Latest Appearance Yoshi's Island DS

These ghosts are the ghostly form of a Shy Guy. They are white in color and, are sometimes seen in Bowser's Kingdom. Appearing exclusively in the first, and fourth episodes, as two Shy Guys (the latter was named "Harry") died, and became Boo Guys. There is a stronger form of this called a Ghoul Guy.