From the Super Mario Wiki
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Fawful also communicates with Bowser via Fawfulcopter at various points in the game, via a mouth that comes out of the bottom on a rod. As such, Fawfulcopters often appear during cutscenes when Bowser is being controlled. They also appear in Princess Peach's Castle, and hold keys which open certain doors in the castle.
In battle, Bowser can inhale them, and Mario and Luigi can fight them. In lieu of an attack, they flash a red light, which summons more enemies when fighting with Bowser; if inhaled, the alarm is effectively disabled. The Fawfulcopter doesn't have any attacks but it can escape Bowser's body if Mario and Luigi don't destroy it two turns.
The name "Fawfulcopter" may be a reference to the ROFLcopter.
Later on in the game when Bowser reaches Peach's Castle, he has to chase three Fawfulcopters each holding a key that unlocks a room in the castle. Once Bowser catches one, it flees and gives up the key.
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