Crimson Viper

Crimson Viper(クリムゾン・ヴァイパー), also known as Maya (マヤ), is an American fighter employed by S.I.N., and presumed head of the "Battle Suit" Project. In reality, Crimson Viper is a secret agent under the employ of a U.S. government agency, presumably the CIA. She enters and participates in the latest world tournament under the guise of acquiring data for the Battle Suit for S.I.N., though her true motives are to acquire data from the BLECE Project (Pronounced Blees), in addition to eliminating "Number 15".

Battle Suit
Crimson Viper wears a specially designed Battle Suit for the tournament, developed and manufactured by S.I.N.. When inquired by an Executive as to the reason for her participation in the tournament, she states that she's the only test subject to utilize 100% of the suit's capabilities effectively, and thus is the prime candidate for the field test. The suit is remarkable in the sense that it resembles an ordinary business suit, though two weapons lurk within the accompanying gloves and boots.

The gloves have metal knuckles that can be electrically charged, creating visual arcs of electricity when enough power is supplied; these can stun or damage an opponent quite heavily at higher settings, which combined with Viper's natural speed and agility pose an incredible danger to fighters of all skill and size. The boots hold jets inside the arc between the heel and sole, with a switch on the side of the boot activating the temporary jet propulsion. The boots are capable of granting the wearer a much greater jumping ability, though Viper frequently fires them up and uses them in a defensive kick, burning anyone within distance.

The suit does not provide the wearer with any sort of ranged attacks or abilities in the traditional sense. No fireball or sonic-boom like projectiles. But the gloves when switched to a particular setting allows C.Viper to unleash the "Seismic Hammer," a ground explosion from beneath her opponent that she causes by punching the ground with the glove. A very deceptive attack considering it travels beneath the floor. The Battle Suit does not (presumably) protect the wearer from damage; it was designed for stealth and ease of concealment, not Battlefields or War Zones.

Street Fighter IV
Crimson Viper was first introduced in Street Fighter IV as a new character and foil to Chun Li & Cammy (Home Release). Though employed by S.I.N., in reality she is a mole for an American Intelligence Agency investigating the BLECE project while assassinating a select group of targets. It is revealed through her story that her target is Seth, one of many constructs designed to serve as an unstoppable army for M. Bison, in addition to the fact that he is number 15 of a presumed 41 others (assuming she is killing them in order; this is never confirmed). In addition to assassinating Seth, she's also to acquire the data on BLECE and turn it over to her employers after the tournament. Unfortunately, the data pertaining to BLECE is destroyed by Cammy before Viper has a chance to copy it, resulting in several years of investigation disappearing into thin air. The data linking Shadaloo to S.I.N. is not destroyed, however, and is recovered by Chun Li prior to the Facility's destruction.

It is unknown if C. Viper's endings are canonical, though considering her role in the endings of several other characters, it is assumed there is some degree of legitimacy to them.

Viper also has a young daughter not depicted in the game, but Viper will speak to over cell phone at the end of battles, showing a softer and more humanlike tone in her voice and generally cold personality. Her daughter is unaware of the double-life she leads. Her daughter is shown briefly in Street Fighter: The Ties That Bind when Viper goes to pick her up from school.

Video
Crimson Viper vs Sagat in Street Fighter IV

Crimson Viper's ultra combo in Street Fighter IV