First appearance Main game: New Super Mario Bros. (2006)

Appearance:
small
Color: Blue
has 5 white spots around the head
Has eyes
No body, just the head
Isn't alive, but the eyes is open so it looks like it's alive
Doesn't speak, because it's an inanimate object.
No mouth

How it moves:
It slides on the ground slowly

What it does:
It shrinks you 0.5x the size, and you have a floaty jump

If you get hurt or injured, even a tiny bit, you revert back to your normal size
(Based on the TSMB Movie)