Street Fighter II/Ken

While Ryu and Ken follow the same martial arts discipline, as the Street Fighter series evolved, the differences between the two characters was portrayed by their attacks: Ryu focused on technique while Ken opted for stylish unpredictability. Ken mainly focuses on the Shoryuken move, to the point where his Shoryukens set the opponent on fire. Ken's Tatsumaki Senpuukyaku does not allow him to dodge projectiles at the start of the spin, but spins faster, allows him to hit his opponent up to five times. Ken's Hadouken attacks are less concentrated than Ryu's, but Ken's Shoryuken is more powerful.

Background
When Ken was about 12 years old, his father, a rich hotel tycoon, thought that his son needed to learn about discipline, lest his son become a spoiled brat all of his life and try to leech onto the Masters' family fortune. In order to do so, the elder Masters sent Ken to Japan to train under his best friend, the mysterious karate master Gouken. At first, Ken was very hesitant to learn from Gouken, wanting to go back to the United States, but later began to respect his master. He even enjoyed the company of Gouken's adopted son, Ryu, since he had a foil to finally pull pranks on, although this got Ken into a lot of trouble. Ryu and Ken would later become best friends and each other's principal rivals.

When Ryu was 23, Gouken decided that both of his pupils had grown up to be fine fighters and decided that their training was over and could now leave the dojo. Ryu decided to travel the world in order to continue his training, whereas Ken was finally happy to be going back home to the United States after his years of straining his back for master Gouken and finally learning the meaning of humility. After coming home, Ken competed in many different Martial Arts tournaments held in the United States, winning most of them.

Ken did not participate in the first Street Fighter tournament; instead, he fought in (and won) the premiere U.S. Martial Arts tournament that had been previously won by Charlie, as well as meeting a very attractive girl named Eliza, who became his girlfriend. After winning the U.S. martial arts tournament, Ken returned to his training ground to tell his master Gouken the good news. There he witnessed his master's death at the hands of Akuma. Enraged and grief stricken, he attacked Akuma, only to be defeated.

Ken received an invitation to the second Street Fighter tournament, but since his last U.S. Martial Arts tournament, he had let himself spend too much time with his girlfriend, Eliza, rather than training. Only Ryu's personal challenge rekindled Ken's fighting spirit and persuaded him to enter the second World Warrior tournament. After the events of Street Fighter II, Ken is married to Eliza, something he vowed only to do after winning a decisive victory against Ryu. However it is unknown if the two fought during the tournament, or if Ken actually won. No details have been stated.