Zero (Mega Man)

Zero is one of the three protagonists in the Mega Man X series, the other two being X and Axl.

Zero's Beginings
He was a robot built by Dr. Wily to destroy Mega Man and Bass but Dr. Wily never used him as he had the maverick virus, a virus that causes reploids to turn evil, so he sealed him in a capsule. He later was revived and was eventualy was defeated by Sigma and the virus was passed to Sigma so Zero changed sides and eventually became one of the most skiled maverick hunters.