Story.
Ryu is a warrior trained in a form of non-lethal Ansatsuken, utilising elements of judo, karate and koppo to form a solid fighting style. On hearing about the first Street Fighter tournament (Street Fighter 1), Ryu eagerly enters himself in to prove his prowess. Quickly advancing to the final bout against the host of the tournament, Sagat, where he began to have trouble. As it seemed that Sagat would win, Ryu became consumed by his own desire to win and felt himself get overtaken by a mysterious force that propelled him to tear through Sagat with a vicious Metsu Shoryuken. Leaving his opponent with a large scar upon his chest, Ryu had achieved victory. Confused by what made him win that battle he returned to his sensei's training grounds, hoping he would have an answer, but when he returned he discovered that his sensei had been killed by a warrior named Gouki. Sensing Gouki's energy, Ryu travelled to find him. (Street Fighter.)
Finally meeting up with Gouki at his island of Gokuento. He fights with the warrior and, after a long battle, Gouki explains that Ryu wields the same power as he does, the Killing Intent (Satsui No Hadou), and says that once it awakens within him he will become more powerful than ever before. Left more confused, he remains focused despite Gouki's words, and resorts on a journey to better himself and find out the meaning of the Killing Intent (Street Fighter Alpha 2.)
Wavering between himself and succumbing to the Killing Intent, he continues his journey to find the answers and to accept new challenges from potential opponents. One day, a mysterious woman named Rose came up and warned him of a man named M.Bison- the leader of a vast organized crime syndicate- who was tracking Ryu down. She goes on to advise Ryu that he must fight with his soul and not his physical self or he will lose to Bison's will. Despite her warning, Bison finally found Ryu- telling him that if he did die, his soul would remain for ever more within Ryu. Feeling Bison's power trying to take him over, Ryu discovers the Killing Intent within him, but soon succumbed to Bison's brainwashing. Defeated by Sagat, disgusted by Bison's control of Ryu, he managed to overcome the control over his mind as Bison disappeared. Realising that giving into the want to just win is not the way to go, he overcomes the Killing Intent and goes on confident of the future matches and potential he will soon face. (Street Fighter Alpha 3.)
Entering both the Street Fighter 2, and then the Street Fighter 3 tournament later on, he continues to hone his skills. After losing to Oro in the 3rd tournament, he decides to use the loss to motivate himself to become stronger after realising what power Oro contains. But first, he travels to Oakland in America to seek out his friend and former training partner Ken, before finding him in New York. Winning against Ken, and then against Alex, he encourages the both of them to keep on fighting before resuming his quest to better himself. (Street Fighter 3: 3rd Strike.)
 

Moves.
Hadouken - QCF+Any Punch Button.
Dragon Punch- DPM+Any Punch Button.
Hurricane Kick- QCB+Any Kick Button.
Shakunetsu Hadouken- HCF+Any Punch Button.
Joudan Sokutou Geri- HCF+Any Kick Button (in the Street Fighter 3 games).

Super Combo's.
Shinkuu Hadouken- QCF, QCF+Any Punch Buttom.
Shinkuu Hadouken- QCF+Two Punch Buttons together (in the Marvel and Street Fighter crossovers).
Shinkuu Tatsumaki Senpu Kyaku- QCB,QCB+Any Kick Button.
Shinkuu Tatsumaki Senpu Kyaku- QCB+Two Kick Buttons together (in the Marvel and Street Fighter crossovers).
Shin Shoryuken- QCF,Down,Down/Forward+Any Kick Button. (Level 3 super move).
Metsu Shoryuken- QCF,QCF+Kick. (in Street Fighter Alpha 3).
Denjin Hadouken- QCF,QCF+Any Punch Button (hold to charge, then release to fire) (in the Street Fighter 3 games).

Meteo Combos (in the Street Fighter EX games).
Shin Shoryuken- QCF,QCF+All Kick Buttons.