Propeller Shy Guy

Propeller Shy Guys, also known as Flying Shy Guys, are a variant of Shy Guys that first appeared in Yoshi's Story. They fly via a helicopter-like pack that they carry on their back consisting of a two-blade propeller (on top of the pack), which spins on a horizontal axis, and an eight-blade propeller (at the back of the pack), which spins on a vertical axis. These propellers are powered by the Propeller Shy Guys themselves, who continuously pedal with their feet to remain airborne, although the pedals are not visible.

Yoshi's Story
Propeller Shy Guys debut in Yoshi's Story, where they fly above Baby Yoshi carrying fruit. They will continue to fly back and forth across the area where they appear in, but will immediately fly off-screen if Yoshi eats the fruit they are carrying.

Propeller Shy Guys may appear alone or in a swarm. When swarming, they will alternate between moving across the background and the foreground in a loop. They can be defeated by Baby Yoshi like any other Shy Guy (with the exception of the Black Shy Guy, which has its own characteristics).

Super Smash Bros.
In Super Smash Bros., they appear occasionally in the background of Yoshi's Island stage, sometimes carrying fruit.

Super Smash Bros. Melee
Propeller Shy Guys appear as a stage element, and as a trophy in Super Smash Bros. Melee. They appear as enemies on the Yoshi's Island: Yoshi's Story stage, carrying food. When attacked softly, or if an object is thrown at them, the Propeller Shy Guy drops his food and flies off the screen; if they are knocked out with an attack, they drop the food they are carrying, and spin downwards off the screen. If food is disabled in the item switch, they do not bring food. They also sometimes appear in the background of the Yoshi's Island stage from Super Smash Bros., renamed Past Stages: Yoshi's Island.

Super Smash Bros. Brawl
Propeller Shy Guy is one of the many characters to appear as a Sticker in Super Smash Bros. Brawl.

Super Smash Bros. Ultimate
Propeller Shy Guys reappear in Super Smash Bros. Ultimate, where they return as stage elements in the Yoshi's Story stage from Super Smash Bros. Melee.