Akuma (in Japanese, "devil"), known in Japan as Gouki (豪鬼 Gōuki, ごうき?), is a video game character from the Street Fighter series of fighting games. Akuma made his debut in Super Street Fighter II Turbo as a secret character and hidden boss. In the Street Fighter series storyline canon, he is the brother of Ryu and Ken's sensei Gouken. Gouken and Akuma studied under a man named Gotetsu. Over time, Akuma became obsessed with pursuing forbidden energies in search of invulnerability. Once he found a way to harness the power of the Dark Hadou, he embarked on a wave of carnage that began with the killing of his own master.

At some point he apparently killed Gouken, which causes Ryu and Ken to want to defeat Akuma. However, in Street Fighter IV, Gouken is shown to be alive. Since they all trained in the same school of martial arts, Akuma's fighting style resembles Ken and Ryu's. Akuma fights only to test his and his opponent's strength. This means that he will only fight opponents that will provide a challenge, hence his refusal to fight unworthy challengers under any circumstances.

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Guile (ガイル Gairu?) is a video game character in Capcom's Street Fighter series of fighting games. In the live action Street Fighter movie, Guile is given the full name of William F. Guile with the military rank of colonel, which was also used in the US Street Fighter cartoon, but was never adapted into the video game series. In the Udon Street Fighter comic book, Guile is the character's first name. Guile made his first appearance in Street Fighter II (1991) as one of the eight selectable characters featured in the original version of the game. A Major in the United States Air Force, he leaves his country and family to enter the World Warrior tournament and avenge his friend Charlie's death, who was killed by Bison, the tournament's sponsor sometime before the events of the game.

In his ending, he defeats Bison, but is dissuaded from killing him by his wife Jane (Julia in the Japanese version) and their daughter Amy (Kris in Japan). Guile spares Bison and returns home to his family. Guile is very often seen as the most logical character to have actually won the second World Warrior tournament due to its fit in official Street Fighter canon.

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M. Bison, known in Japan as Vega (ベガ Bega?), is a video game character created by Capcom. First introduced in Street Fighter II: The World Warrior, the character is a recurring boss and antagonist in the Street Fighter series of fighting games. A would-be world dictator, a pure incarnation of evil, M. Bison's ambition is to control the world's governments through his covert crime syndicate, Shadaloo (シャドルー Shadorū?, sometimes spelled as "Shadoloo", "Shadowloo" or "Shadowlaw"). He serves as the host of Street Fighter II 's fighting tournament and is the last opponent fought in the game. Bison first appears in the original Street Fighter II as the final computer-controlled opponent in the single-player mode, following the player's defeat of the other three Grand Masters. The battle takes place in the streets of Bangkok, Thailand in front of a crowd, where he poses with his cape prior to battle.

He was originally a non-playable character in the first edition of Street Fighter II, but became selectable from Champion Edition and onward, while maintaining his position as the final boss until Super Street Fighter II Turbo, in which a hidden character named Akuma defeats Bison and challenges the player as an alternate final boss.
The storyline through the numerous versions of Street Fighter II characterizes Bison as the leader of a terrorist organization called "Shadaloo" who sponsors the World Warrior tournament. A few characters who participate in the tournament have a personal vendetta against Bison. Chun-Li and Guile are both seeking to avenge the deaths of their loved ones (Chun-Li's father and Guile's best friend respectively), while T. Hawk wants to avenge both his homeland and his father, that were destroyed and devastated by the villain; the amnesiac Cammy, on other hand, believes that Bison is connected to her past and learns in her ending that she was once one of his agents.

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Chun-Li (チュンリー Chun-Rī?, based on Chinese [simplified: 春丽 traditional: 春麗] Chūn-Lì) is a video game character created by Capcom. First introduced in Street Fighter II. Her name in Mandarin is (chun 春 "spring", lì 丽 "beautiful"), meaning "spring beauty". Chun-Li made her debut in the original version of Street Fighter II as one of the game's eight playable characters and the sole female character in the game (before the addition of later characters such as Cammy, Rose and Sakura). Chun-Li's backstory centers around her quest to avenge her father's death, an undercover police agent who disappeared while investigating M. Bison's organization.

In her ending, she fulfills her revenge and decides to return to her life as an ordinary girl. In Super Street Fighter II, the player is given the option to make Chun-Li return to ordinary life or continue her work as a police officer.

Chun-Li is notable for being the first female playable character in a fighting game, and has acquired the nickname "First Lady of Fighting Games" among enthusiasts.

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Sagat (サガット Sagatto?, based on Thai สกัด) is a boss character from the early editions of Capcom's Street Fighter fighting game series. Sagat is very tall at 7'4" (224cm), two heads taller than Ryu in Street Fighter, a trait he uses to his advantage in his long-reaching attacks. He possesses a hulking, muscular build. His hands are massive enough to close around the entire head of many of his opponents. He is depicted as bald. In the Street Fighter II series, Sagat's in-game sprite does not display the highly muscular build of the Street Fighter Alpha series, although even at that time he had been consistently portrayed so in his Super Street Fighter II Turbo ending, and other Capcom artworks. Later on, the game graphics developed to match those of the comics.

Sagat wears an eyepatch over his severely damaged right eye, though the lack of depth perception and loss of peripheral vision do not seriously hamper his ability as a powerful fighter. Sagat lost his eye due to a fight with Go Hibiki, the father of Dan Hibiki, in the same fight in which Sagat killed Go.
The massive scar on his chest is a constant reminder of Ryu's victory. Sagat makes no attempt to conceal the disfigurement, and in fact draws power from the hateful memory it invokes; in Capcom vs. SNK 2, Sagat's scar glows while he charges energy for his S-Groove super meter.
Sagat wears traditional Muay Thai kickboxing shorts and classic wraps. The trunks have colors varying from purple with yellow trim in the original Street Fighter, to blue with red trim in Street Fighter II and to blue with yellow trim in Street Fighter Alpha. He wears tape around his hands and feet to protect his knuckles and shins.

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