
He has a pet robot wolf named Velguarder, his One-Winged Angel form in the first game is a large robotic wolf, and his symbol is the Greek letter Sigma designed as a wolf. He then extends this attitude towards earlier reploid models for the sake of the Next Generation ones.

However, later games would establish that Sigma went Maverick after his fateful encounter with Zero, which would get the former infected with the Maverick Virus to merge with Sigma's mind to form the Sigma Virus. Ambiguous Start of Darkness: From the first game's manual, it was always established that he led his Maverick rebellion as he believed that humans were limiting the evolution of Reploids.
