Ken Masters is a sub-protagonist in the Street Fighter series, first appearing in Street Fighter 1. He is the sworn brother, best friend, and rival of the main character Ryu. Trained under their teacher Gouken, Ken honed his skills and returned to the US, becoming the former All-American Fighting Champion and Vice President of the Masters Foundation. He wields the Shoryuken as his signature technique, sublimating it into his own style without being swayed by dark influences. Married to Eliza, he later faced accusations of organized crime, abandoned his position, and went into hiding. Renowned as a top expert and great rival to Ryu in the North American fighting world.