Quiet is a female sniper / assassin. Her weapons include a lethal sniper rifle.
Metal Gear Solid 5 The Phantom Pain's producer and director Hideo Kojima was explicit when he said: "I've been ordering to the game's art director to make the Quiet character more erotic, to make people want to do cosplay. She's a really unique character. I wanted to add that sexiness to her. It wasn't really supposed to be erotic, but sexy".
Now that the video game is out in the stores, we can only be grateful to Hideo Kojima: Quiet is a character that has already been cosplayed by many artists.