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.
Mega Man Zero seriesIn the Mega Man Zero series Zero is the protagonist. He looks different but that is explained in the games.
|Mega Man characters|
|Mega Man series||Mega Man • Dr. Light • Dr. Wily • Proto Man • Bass • Roll • Rush|
|Mega Man X series||Mega Man X • Zero • Axl • Sigma • Vile • Dr. Cain • Iris • Alia • Douglas • Signas|
|Mega Man Zero series||Dr. Ciel • Copy X • Elpizo • Dr. Weil • Omega|
|Mega Man Battle Network series||Lan Hikari • Mayl Sakurai • Dex Oyama • Yai Ayanokoji • Eugene Chaud • Mega Man.EXE • Roll.EXE • GutsMan.EXE • Glide.EXE • ProtoMan.EXE • Bass.EXE|
|Mega Man Star Forces series||Geo Stelar • Sonia Strumm • Luna Platz • Bud Bison • Zack Temple • Solo • Star Force Mega Man • Omega-Xis • Lyra • Vogue • Taurus • Pedia • Laplace|