Sigma

Sigma is an evil robot that, like X, has a free will. Unfortunately he uses that free will to wage a war against the humans. He wishes to destroy all humans to make robots the supreme masters. Sigma once was a former Maverick Hunter, but he got infected by the virus Zero had with him in the battle when he found Zero damaged and out of control in some ruins. Later, Sigma created the Sigma Virus. He seens to know that a lot about Zero, like that he is Dr. Wily's last creation. Sigma and Zero were destroyed in the end of Mega Man X5, but Gate ressurected Sigma in Mega Man X6. Sigma is destroyed for good in Mega Man X8, as Lumine is revealed to be the first of the "turn-Maverick-at-will" Reploids.



Fun facts
appearance was largely inspired by Doc Robot from Mega Man 3, one of the few antagonists in the series not designed by Inafune himself. He then stated that although Mega Man 3 is his personal favorite of the original series titles, Sigma is the only creation of his or any of his staff to borrow from that game's wealth of characters.
 * Sigma (Σ) is the 18th letter of the Greek alphabet.
 * Sigma is called Cigma in the Mega Man cartoon series.
 * According to Keiji Inafune, Mega Man's creator, Sigma's