Yang

Yang (ヤン) is a character in the Street Fighter series. He first appeared in Street Fighter III and is voiced by Koji Tobe in New Generation and 2nd Impact and by Masakazu Suzuki in 3rd Strike. However, Yang is selectable only as a "palette swap" of his brother Yun in New Generation. In the latter two games Yang is a separate character with his own unique set of Special Moves and Super Arts. He has been confirmed to be a playable character in the upcoming arcade version of Super Street Fighter IV.

Story
The Lee Brothers were only relatives to their long-lost uncle Lee who fought in the first World Tournament (his wherabouts after that was unknown but he did request Gen to train them). With his twin brother Yun, he entered the third World Warrior tournament to show his skills. They later found and fought Gill, who appreciated their effort and granted them leadership of their town. They passionately turned down his offer, since they only fought him to stop his maniacal plans.

Alternate Story
In his non-canonical appereance in Street Fighter Alpha 3, he and his twin brother Yun are searching around the world for the legendary movie star Fei Long. So they would become famous movie stars in their own hometown. They have run-in with Dee Jay (who by chance is known to associate with Fei Long) and so Yun fought him and won their match. Yun also heard rumors of Fei-Long works with drug dealers (which was Shadowlaw). But Dee Jay knows he is nice, a great fighter and would never associate with these kind of people and so he told Yun where he would find Fei Long. They finally found Fei Long and fought to know the truth about him. After Lee Brothers won, Fei Long told Yun and Yang that was infiltrating the drug deals til these all leads to Shadowlaw and Bison. The Lee Brothers decided to help Fei Long in order to save their hometown from Shadowlaw. Lee Brothers and Fei Long were caught by Shadowlaws. Fei Long let Yun finish off the rest of members of Shadowlaw's The Dolls and he finds and finish Bison. Yun finds Fei Long defeated at Bison's feet. Bison ask Lee Brothers to join him and Shadowlaw, but they refused. And so they fought and Lee Brothers became victorious and with help Fei Long. They finish Bison once and for all. Fei Long thanks and in return Lee brothers got their wish to become movie stars and starred on their own movie Street King 2: Three Dragons (in which became box-office smash hit) and spread through the streets of Hong Kong.

Super Street Fighter IV
He has been confirmed to be a playable character in the upcoming arcade version of Super Street Fighter IV and will come as DLC for the home versions.

here is all the information that is known so far:
 * Yang's Super is his Seiei Enbu (Custom Combo) from Third Strike.
 * Yang's Ultra 1, Raishin Mahhaken, makes him throw out a single attack — if it connects cleanly, animation follows. If not, the ultra ends there — similar to Makoto's Ultra 1. This will only connect from close range.
 * Ultra 2, Tenshin Senkyuu, makes Yang roll forward along the ground and then go up in the air with a rising kick. If he connects cleanly on the ground with the roll portion, the rest of the animation kicks in. This Ultra will pass under fireballs and it has some tracking properties. If his Ultra 2 is started while the opponent is in the air, Yang will rise up with kicks where they're jumping, but in this scenario it won't lead to full damage.
 * He also has his Third Strike target combos.
 * Yang's command dash was in and crossed up like Ibuki's in SSF4.
 * His EX Fist Slashes looked like a great move, crazy fast.
 * His Focus Attack looks similar to the 2 hit overhead move that Gen has.
 * Color 1 is pinkish, Color 2 is purple.

Stage Theme
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Trivia

 * Yun and Yang are collectively known as the Lee Brothers. Out of the twins, Yang is younger.
 * He appears in Chun-Li's opening movie in Street Fighter IV with Yun. The twins also make a brief appearence in Chun Li's Super Street Fighter IV ending. The duo would later become playable in the arcade version of Super Street Fighter IV.
 * Lee is stated to be Yun and Yang's uncle.
 * Yang bears a strong resemblance to Trowa Barton from Gundam Wing.