From the Super Mario Wiki, the Mario encyclopedia
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Foos are white cloud-like enemies that first appeared in New Super Mario Bros. Wii. They produce fog that can obscure the player's view. Foos can be defeated with any kind of attack. Their name comes from Fwoosh, a similar enemy from Super Mario 64 and its remake that blows wind. Additionally, Twisters from Super Mario Maker 2 were originally going to have a Foo-like design.
Super Mario series
New Super Mario Bros. Wii
New Super Mario Bros. U
New Super Luigi U
Mario Party 10
Foos play a role in the Mario Party 10 minigame Foo Me Once, where they blow fog to obscure the buttons displayed on the platforms which the players need to remember in order to safely traverse across.
Dr. Mario World
In Dr. Mario World, Foos appear in the background of World 15 once an area has been cleared.
Names in other languages