Though the series has a large variety of characters with their own unique style of play, the most popular characters have always been Ryu and Ken, because of their signature fighting style and appearances. It is also mistaken that Ryu is always the main character in the Street Fighter games, because he is the most recognizable.
Street Fighter-Originally focused around a Japanese fighter named Ryu, a student of the martial art form known as Ansatsuken(mistaken for Shotokan karate in the US). Ryu wins the first Street Fighter tournament against Sagat, when he transforms into Satsu no Hadou Ryu("Evil Ryu"), delivering a Shoryuken so powerful Sagat bears a huge scar on his chest.
Street Fighter Alpha series-A prequel to the events occured in Street Fighter 2. Composes of two main storylines: Ryu deciding whether he should accept the Satsu no Hadou that Akuma gave into or not, and the rise, fall, and ressurection of M.Bison, the leader of Shadowloo. Ryu decides to not give into Satsu no Hadou, and M.Bison is destroyed, thanks to Charlie's sacrifice by destroying Bison's source of power.
Street Fighter 2-Official storyline of Street Fighter 2 is in Super Street Fighter 2: Turbo Revival. M.Bison is revived by having his soul transferred into a new body, and he holds the second Street Fighter tournament to find strong opponents and for a new body host. While there is no real main character in SF2, it is suspected that Guile is the winner of the tournament, because while everybody's ending happens, Guile's is the only one that requires him defeating Bison, so by logic, that would make him the winner. Bison is officially killed by Akuma after the tournament.
Street Fighter 3-Storyline doesn't officially start until 2nd Impact. Gill, leader of a cult called "Illuminati" who also seems to have a really bad case of the Jesus complex, holds the 3rd Street Fighter tournament to find those worthy to be saved by Illuminati. The hero of Street Fighter 3 is Alex, who is officially the winner of the 3rd tournament. Gill declares Alex to be "the one", and pursues him thereafter.
Street Fighter 3: 3rd Strike-Epilogue of 2nd Impact, and currently the last Street Fighter game in the series, regarding storyline. In the style of the Alpha series, 3rd Strike shows what everyone has been up to one year after the 3rd tournament has ended. The main character is Chun-Li, who is out to search for a girl that was kidnapped by Urien.
2) Movies done by Sonny Chiba, seen recently on "Kill Bill".
The origins of the word are vague, but it is believed to have been in use in the UK sometime before the Streetfighters magazine branched away from its sister publication BSH. Various people have claimed that they were the first to use the word, and all have subsequently been beaten around the head with a 916 tailpiece and told to shut the feck up.
"If this fart comes out now, i will totally street fighter you. be prepared."