"In the end, there is only me."
Kaiser Sigma is the Emperor of the Maverick Empire and the God of the Reploid race. Sigma defeated his Repliforce brothers and has overseen the near-extermination of the human race, leaving Reploids as the dominant species on the planet. All of his dreams have been achieved beyond even the wildest dreams of his early followers. Ultimately, his victory over his foes was his personal defeat, as he threw away his morals in favor of a more expedient route to victory. Any hint of the Reploid revolutionary he once was has been crushed by the cruel autocrat that his victory has made him into. Sigma is the ultimate power of his world, fueled by the resources of an entire planet into a seemingly invincible juggernaut. Yet, despite his absolute domination on the battlefield, Sigma now rarely leaves his chambers. The day-to-day rule of the Empire has fallen to Lady Viris, who joyfully took on the responsibility after the death of Magistrate Vile. Some say this is because the Emperor is beginning to plan the final campaign against Fortress Angeles to rid the planet of humanity once and for all. In reality, Sigma has imprisoned himself within his chambers in one of his final lucid acts. The madness that has plagued Sigma since he was initially infected with the Maverick Virus has all but consumed him, making Sigma the greatest threat to his own Empire. He rages now, contained within his inner sanctum, against the only enemy he remembers clearly -- X.
Kaiser Sigma has appeared twice; once during the first dimensional event in 2213, with his other appearance being during the third dimensional event in 2219. On both occasions, the Kaiser was defeated by the heroes of Earth. He is believed to have been finally destroyed during the second incursion. Some people think he was grateful.