Zero (ゼロ) is the main protagonist of the Mega Man Zero series. After the Mega Man X series, Zero offered up his body for anti-virus research, resulting in the creation of the Mother Elf but also the cataclysmic Elf Wars. After helping stop the conflict, Zero sealed himself away again, only to be awoken by Ciel a century later to help the Resistance fight the tyranny of Neo Arcadia. In crossover games featuring this style of Zero alongside his original appearance from the Mega Man X series, this Zero is sometimes referred to as Mega Man Zero[2][3] or Zero (Z).[4] Zero lives on through Biometal Model Z in the Mega Man ZX series.