Quiet

Quiet was a mute female sniper who was active during the 1980s. Eventually, she managed to save Big Boss, and effectively surrendered herself into Diamond Dogs custody. Because of this, despite Kazuhira Miller's insistence that they kill her due to her being too much of a liability due to discovering the location of Mother Base, Ocelot and Big Boss instead suggested that they lock her up, although Big Boss agreed that she might have to be killed if she proved to be too much of a threat to Diamond Dogs' existence, adding that he would be the one to kill her. At some point, she was tortured by Ocelot and managed to take down three Diamond Dogs soldiers on Mother Base.

Behind the scenes
Quiet first appeared in the E3 2013 trailer of Metal Gear Solid V: The Phantom Pain, in which she is described as being "A Sniper deprived of her Words." In the extended trailer, she is seen being tortured by a soldier and Ocelot via electrocution while having a bag over her head. Quiet's voice and motion capture will be provided by the Dutch-born Japanese model and actress, Stefanie Joosten.

When asked about Quiet during a interview with Famitsu, Hideo Kojima replied: "In the game, Quiet is the main heroine. Whether she is friend or foe has yet to be revealed so I had to be careful when casting her role. MGS normally has old timers and old guys (laughs). Stefanie is very skilled in action but since she never held that type of gun, we asked her do some training at home." He also told 4Gamer: "With Stefanie, we had to make sure to focus her 3D motion on capturing her facial and body language and not her voice, since Quiet does not speak. She does make small sounds like “ugh” and “ah” though."

On September 6, 2013, in response to the mixed reaction concerning Quiet's characteristics, Kojima clarified exactly what he meant when he asked lead designer Yoji Shinkawa for a "more erotic" character. Speaking through a translator, he said: "Maybe the phrase 'erotic' wasn't really [the correct word for] what I was trying to say. What I'm really trying to do is create unique characters. One of those is, of course, Quiet. She's a really unique character, I wanted to add that sexiness to her. It wasn't really supposed to be erotic, but sexy." He also said, "You're going to notice [when you play,] but there's limited dialogue with the [Metal Gear Solid 5], and for that reason we really want to show the characteristic from each character. Sexy could be for guys, weapons, vehicles, it's really that characteristic." Shinkawa also weighed in at the Q&A, saying, "From my perspective, it's not just the characters, but often I look at a weapon or a vehicle and think 'That's really sexy.' It's not just the characters, but the mechs and weapons [as well]." When asked for her thoughts on Quiet's design, Joosten stated, "Of course, I was surprised to see Quiet's outfit at first. But, you know, it fits in the Metal Gear universe, I think. I don't think I'm allowed to say a lot about this, but, well, Mr. Kojima has his reasons for deciding why Quiet [is] wearing what she's wearing. Players will just have to look forward to that."

On September 8, 2013, Kojima stated, "I know there's people concerning about 'Quiet' but don't worry. I created her character as an antithesis to the women characters appeared in the past fighting game who are excessively exposed. 'Quiet' who doesn't have a word will be teased in the story as well. But once you recognize the secret reason for her exposure, you will feel ashamed of your words & deeds. The response of 'Quiet' disclosure few days ago incited by the net is exactly what 'MGSV' itself is."

On November 7, 2013, some concept art for The Phantom Pain was leaked on the Tumblr account "european-extreme." One of the concept arts for Quiet strongly resembled Paz Ortega Andrade though Paz was killed in Metal Gear Solid V: Ground Zeroes.

With The Phantom Pain still in development, a fan theory has circulated on the Internet that Chico, due to the trauma of his incarceration at Camp Omega, and the death of Paz in Ground Zeroes, underwent a sex change to become the female Quiet. Konami employees expressed their surprise and humor at the theory in the sixth episode of the English version of Kojima Productions' webseries, Kojima Station, but chose to not confirm or deny it in order to avoid spoilers. In the ninth episode of the Japanese version of Kojima Station, Stefanie Joosten addressed the theory, saying that "Quiet is definitely a female, while Chico is a male."

On September 11, 2014, Kojima Station featured a short clip focused on Quiet. The clip revealed that Quiet possesses the ability to become invisible, shown by her vanishing while escaping from a Diamond Dogs helicopter, only to later reappear behind the soldiers onboard Mother Base. According to Kojima, her ability and arrival on Mother Base was intended to be an homage to Metal Gear Solid 2: Sons of Liberty, more specifically the infiltration entry paths for Solid Snake and Raiden during the Tanker and Plant Chapters, respectively.

On September 18, 2014, during the TGS demo of The Phantom Pain, Quiet was shown to be one of many "buddy" characters available to the player during the course of the game. When arriving at a location set by the player, she will contact the player via radio and hum to indicate that she arrived at the destination. The demo also unveiled more of her abilities, more specifically she also possessed superhuman speed. During the demo, Kojima commented that Quiet had a weakness that tied into the story. He also implied that the full extent of her abilities depends on her bond with the player, and that the player, depending on their actions, may never even meet her at all. In an interview with Dengeki Online after TGS 2014 ended, Kojima stated that the concept behind Quiet's design was nudity, "a naked sniper," and reiterated his statement that her reason for looking this way will surprise the audience. He also confirmed that Quiet is not Chico. Furthermore, he stated that characters in the game will question Quiet's appearance as well, and reiterated that she had the design for a reason. Finally, he revealed that Quiet, like all AI-controlled buddies such as the horse and D.D., will be permanently removed from the roster if they are killed during a mission, although this won't impact the game's story. In a later interview, Kojima confirmed that Quiet will not be the only character with supernatural powers. He also revealed that Quiet and any other AI controlled buddy soldiers will not be played independently of Snake.

Quiet isn't the first character in the Metal Gear series with supernatural abilities, even though hers seem to be more extreme than those previously depicted. In Metal Gear Solid 3: Snake Eater alone, the entire Cobra Unit, save The Boss herself, has superhuman abilities (though The Boss possibly has some supernatural force permeating her, evidenced when the lilies turn red and her scar moves out of her body when she dies), along with Colonel Volgin, who commands lightning from his body.

The Video Game Awards 2014 Metal Gear Online trailer displayed Big Boss using similar powers as Quiet to escape being pinned down during combat.

The Official PlayStation Magazine and Xbox: The Official Magazine confirmed that Quiet is one of four partners the player can select to accompany them on missions. It also revealed that recruiting Quiet may have the downside of causing low morale among the troops at Mother Base. It also mentioned that radio chatter can be picked up about Quiet and her "bloody trail."

Videos
Character making of Quiet