Guts man is one of the 6 robot masters in Mega Man. Originally built for construction, he was reprogrammed by Dr. Wily in his attempt to rule the world. As his size suggest, Guts man have great physical strength, which he relies on during battle. His very jump is enough to make the ground shake. He is generally impatient and hot-tempered, but is more smarter and polite than he appears. He is very passionate at his work and cares deeply about his colleague's well-being.

In his boss fight, Guts man will frequently jump around which, although stuns Mega Man for a few seconds, does not harm him. His main attack is throwing a huge boulder at Mega Man, which can break into smaller pieces. His weakness in the Hyper Bomb and defeating him grants Mega Man the Super Arm.