Zero Suit Samus

Zero Suit Samus is an alternate form of Samus triggered by her Final Smash in Super Smash Bros. Brawl.

When Samus finishes her Final Smash, the Zero Laser, the force of the beam is so strong it causes all of Samus's armor to fall off, which was seen in the E3 Trailer. Once this happens, she turns into Zero Suit Samus. Now, she is easier to KO. Players can even pick up and throw her dropped armor, which now act similarly to items. Zero Suit Samus is, however, more swift and agile than her armored counterpart. She can now also use a gun that transforms into a laser.

Trivia

 * Zero Suit Samus, as her name suggests somewhat, is taken from Metroid: Zero Mission, where a certain scene forces Samus to wear a jumpsuit rather than her normal suit.