Harpuia is a main antagonist from Megaman Zero. He is a reploid serving as one of four guardians of Neo Arcadia, a human/reploid settlement under the rule of Copy X. He was created using X's DNA and given the role of general of an air battalion.

His appearance resembles X's although colored green and having extensions in parts showing his affiliation with wind and lightning. His helmet bears wing-like protrusion giving the look of a valkyrie helmet. He even has mounted thrusters on his back.

As one of the four guardians he possesses great fighting abilities being able to undergo a transformation "Armed Phenomenon" which changes his armor to that resembling a fighter aircraft and an eagle/harpy fitted for air combat. His preferred weapon are a set of dual triangle-shaped pink beam sabers which can conjure energy waves and cut with ease.