Vacuum Helmet

The Vacuum Helmet is a device used by Fawful in Mario & Luigi: Superstar Saga and Mario & Luigi: Bowser's Inside Story. It is used to get Fawful around and attack the Mario bros. It is also noticed to have many functions and is Fawful's most used invention.

Mario & Luigi: Superstar Saga
In Mario & Luigi: Superstar Saga, Fawful uses the Vacuum Helmet to suck up Princess Peach's voice before the onset of the game. He uses the Vacuum Helmet's fireball ability to battle Mario and Luigi when they come to reclaim Peach's Voice; he then uses the attack to destroy Bowser's Koopa Cruiser. Later, when Cackletta is defeated by the Mario bros., Fawful sucks her soul up with the Vacuum Helmet and deposits it inside Bowser's unconscious body, thus saving her from death.

During the final battle of Superstar Saga, Fawful and his Vacuum Helmet are seen in one of Cackletta's attacks, but in ghost form. In the attack, the Vacuum Helmet will shoot fire balls at both bros. If Fawful is in front of Mario, the Vacuum Helmet will first shoot at Luigi first, then Mario. On the other hand, if Fawful is in front of Luigi, the Vacuum Helmet will shoot at Mario first.

Mario & Luigi: Bowser's Inside Story
In Mario & Luigi: Bowser's Inside Story the Vacuum Hemet is used by Fawful to suck the power out of the Dark Star and become Dark Fawful. Afterwards the helmet is fought in the battle against Dark Fawful where Bowser can inhale it and the Mario Bros. will fight it from inside him. In this game, the helmet is less important, although it is much more life-like than before. So far, the helmet's last appearance was in Bowser's Inside Story.

Functions
The Vacuum Helmet has many functions, and is primarily used by Fawful to fly around or hover. The Vacuum Helmet's nozzle can both shoot fiery balls of energy at Fawful's opponents and vacuum up other things, which are then stored within the Vacuum Helmet.

Mario & Luigi: Bowser's Inside Story introduces more functions, including the Vacuum Helmet's ability to function independently from Fawful. It is also revealed that the Vacuum Helmet's nozzle can morph into a kind of basket, inside of which Mario or Luigi can be trapped and drained of their HP. While Fawful is fighting Bowser, he may use his Vacuum Helmet to avoid some of Bowser's attacks or he can revive some of his own HP. The Vacuum Helmet also morphs it's nozzle into what looks like teeth, allowing Fawful to grab onto objects and swing from them. At some point, the Vacuum Helmet will fly above Fawful's head on the top screen, where Bowser can use his vacuum ability to suck it up into his body, where the bros. will fight it. After taking a certain amount of damage, the Vacuum Helmet will explode and cease to exist, making its last appearance.

Trivia

 * It is unknown if the Vacuum Helmet has a life of its own. However, during the battle against Dark Fawful, the Vacuum Helmet can be seen blinking giving more evidence that it has it's own life.
 * The top of the Vacuum Helmet in Mario and Luigi: Bowser's Inside Story makes it resemble R.O.B.
 * Although this device is called "Vacuum Helmet" in Bowser's Inside Story, Fawful still calls it his Headgear, its name in Superstar Saga. It is unknown if this was an error made by the developers of the game or not.
 * It should be noted that in a few cutscenes the Vacuum Helmet is shown to be able of locating the Dark Star, in conjunction with a radar-like device.
 * The Vacuum Helmet somewhat resembles F.L.U.D.D.