"You will pay dearly for your futile resistance, Zero!"
Sage Harpuia is a member of the Four Guardians of Neo Arcadia in the Mega Man Zero series. He was created from X's DNA towards the end of the Maverick War with the task of cleaning the skies and atmosphere of toxic gases after the war had ended. Some time later, he became a military general of Neo Arcadia, commanding the Rekku Army (literally Army of the Fierce Sky), Neo Arcadia's military air force. Though Harpuia for the most part serves as a major antagonist, he's not a true villain.
- Harpuia proves to be one of the most popular characters in the Zero series, possibly due to his extensive character development.
- Harpuia's gender was a subject of discussion in the English speaking Mega Man community when he made his first appearance in Mega Man Zero. Due to his mythological background of being a harpie and Ogata Megumi's voice acting, he was thought to be a female, which is not true. However, even today, Harpuia's gender is still being confused by players not familiar with the series.
- The Robot Master from Mega Man 9, Tornado Man, bears a striking resemblance to Harpuia. In an interesting nod to this, the character is seen standing side by side with Mega Man, possibly referring to X and Harpuia, in which the latter matured into a character similar to the former, personality-wise.
- It's revealed in the Mega Man Zero: The Official Complete Works that the name Harpuia was originally meant to be the name of his swords, not his actual name.