Decay
Regeneration
Block
Break Tackle
Guard
Tackle
Little is known about Vega's youth and his early years, even as to when he was born (most game manuals list his birth year as unknown), but he appears to be in his late 30's to mid 40's although he could be much older. His first appearance, chronologically speaking, was in Street Fighter Alpha, as the head of an elusive criminal and military organization known as Shadaloo. Along with his aspirations for world conquest, Vega had been working on perfecting a lethal and deadly energy that would exponentially increase his fighting ability, an inherently evil energy he refers to as "psycho power". During the events of Street Fighter Alpha, Shadaloo came to the attention of Interpol, and the latter organization sent Chun-Li (an operative with a personal vendetta against the crime lord, who had killed her father) to thwart Vega's plans. Chun-Li and Vega eventually confronted each other and battled, and although Chun-Li defeated him, Vega escaped on his helicopter at the end of their battle, promising to kill Chun-Li in the same manner that he killed her father. During the events of Alpha or Alpha 2, Vega also came into conflict with Rose, a mysterious woman who wielded soul power, the opposite of Vega's psycho power. This fact and the fact that her quest was to stop any and all of Vega's evil plans indicate the intricate connection between the two, and would later be revealed in Street Fighter Alpha 3.
Most likely during the events of Street Fighter Alpha 2, the psycho power began exceeding the limits of his body. Having predicted this event, Vega had his scientists engineer a body that he could transfer his essence to, but that body, Cammy, escaped from Shadaloo's conditioning. Vega then turned his sights to Ryu, one of the most powerful fighters in the world, and the personal nemesis of Vega's former underling, Sagat. Vega captured Ryu and subjected him to intense psychological conditioning; when Sagat objected, Vega turned Ryu on him, telling him he could finally have his rematch. While Sagat battled Ryu, Ryu's friends Ken and Sakura fought Vega. Outmatched, Vega retreated to the Psycho Drive, which restored his power. In Street Fighter Alpha 3, USAF officers Charlie and Guile on a mission to stop the dictator from using his new creation, a satellite (featured in Street Fighter Alpha 3), which can enhance his psycho drive abilities. Guile and Charlie are joined by Chun-Li, and the three of them battle Vega. In order to take down Shadaloo's leader, Charlie keeps fighting him while the base is set to explode, and eventually sacrifices his own life. Vega's soul, however, ended up surviving the explosion and took control of Rose. It is revealed that, while trying to master psycho power, Vega had to expel all the humanity and good in his soul to accommodate and supplant the intense energy the power gives him, and that Rose is actually the formation of all of Vega's good energy. He stayed inside of Rose's body until his Shadaloo scientists could forge a new body for him, the body seen in Street Fighter II. This body, however, was much weaker, since, having inhabited his "good side's" soul for a period of time, he retained both his good and evil energies as he transferred to his new body, thus making his psycho power considerably less effective.
Vega held the second Street Fighter tournament to get revenge against the people who had destroyed the Psycho Drive. His new body was much weaker than the previous, but he was still very powerful. In the end, he was destroyed by Akuma, who killed him with the Shun Goku Satsu and sent his soul to hell to be destroyed. Vega was not heard of in Street Fighter III, and according to Chun-Li's ending in that game, Shadoloo had been destroyed between Street Fighter II and Street Fighter III.