Ken Masters is one of the main characters in the Street Fighter franchise. He is the best friend and rival of the series main protagonist, Ryu. While Ryu is more serious when it comes to a fight, Ken shows a huge ego and often brags about his greatness but still has a pure heart.

When he was twelve, his father, a rich tycoon, sent Ken to train with Gouken to teach his son discipline so Ken wouldn't become a spoiled brat. Training with Gouken allowed Ken to meet Ryu and learn about honor.

Since both Ryu and Ken both seek to fight strong opponents, this draws them to the Street Fighter tournaments. At the end of Street Fighter 2, Ken marries his girlfriend, Eliza. At the end of Street Fighter 4, Eliza gives birth to a son named Mel.

Ken is often recognized as one of the best Street Fighter characters.