M. Bison, known as Vega (ベガ, Bega?) in Japan, is a video game character created by Capcom. First introduced in Street Fighter II: The World Warrior, the character is a recurring boss and antagonist in the Street Fighter series of fighting games.

A would-be world dictator, Bison's ambition is to control the world's governments through his covert crime syndicate, Shadaloo (シャドルー, Shadorū?, sometimes spelled as "Shadoloo", "Shadowloo" or "Shadowlaw"). He serves as the host of Street Fighter II 's fighting tournament and is the last opponent fought in the game. Several Street Fighter characters — including Guile, T. Hawk, Cammy, Rose and Chun-Li — have their personal vendettas against M. Bison and have entered the tournament in the hope of having a shot at him. M. Bison wields Psycho Power, an evil energy which manifests as blue or purple flames and electricity. The character was named the 30th most diabolical video game villain of all time by PC World.

Source: Wikipedia