X

X may refer to:


 * Mega Man X, the main protagonist of the Mega Man X series. In Mega Man Zero series he's the true Neo Arcadia leader, known as Original-X to distinguish from Copy-X.
 * Copy-X, the main antagonist of Mega Man Zero. He's a copy of the Original-X designed and built by Ciel to be supposedly perfect copy of the original, he's the Neo Arcadia leader in Mega Man Zero series timeline, taking over Original-X's rules.
 * Model X a Biometal created by Ciel.