|Full Name||Fly Guy|
|First Appearance||Super Mario World 2: Yoshi's Island (1995)|
|Latest Appearance||Yoshi's Island DS (2005)|
A Fly Guy is a sub-species of Shy Guy that have propellers on their head. They are not to be confused with Flying Shy Guys or Sky Guys. Flying Shy Guys often carry coins, 1ups, keys, and in rare cases, hazardous objects like bombs. Some even mock Yoshi by swooping down and daring Yoshi to hit them, and if Yoshi fails to do so, they laugh maniacally. And on the game Super Mario World 2: Yoshi's Island and its remake, Yoshi's Island DS, if Yoshi lost hold of Baby Mario for more time then the gauge in the upper right corner, some Fly Guys kidnap him, unless Yoshi attacks them or gets the baby first.
Fly Guys also appear as support for Boom Guys or Elite Boom Guys. If a Boom Guy were to lose its cannon, a pair of Fly Guys would come and give them a new cannon. This is the same case for Elites but instead a blue pair of Fly Guys appear, which are extremely rare. Fly Guys, like Shy Guys, also participated in some social events like Mario Power Tennis, although they do not appear as much, being more serious members of the Koopa Troop and having not much sense of fun.