X-ario, the Lucario also known as Mega Riu X, or just X, is the successor to the original Mega Riu and is Khurzu's other creation. He is a Maverick Hunter who fights alongside his partners, Zero-ark and Axl, to protect humans and Reploids alike from Mavericks, though X would like for nothing more than the fighting to stop. X is able to possess free will, sentience, and independent thought, no longer requiring restrictive programming or rules to dictate his behavior. 