Knight Man is one of the Robot Masters that appears in Megaman 6.
Megaman 6
Knight Man was built based on an medieval knight in a fairly sturdy armor. It is said that he defeated more than 1000 robberies at once. Then he was reprogrammed by Mr. X to help him dominate the world. Megaman infiltrates his base to find out about Mr. X, they then faced each other, eventually Megaman defeats Knight Man. In the fight, Knight Man will throw his iron ball into the Megaman and leap toward the Megaman, this can be avoided by deciphering on his attack. He is vulnerable only when he attacks. His weakness is the Yamato Spear.
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