Fire Man is one of the Robot Masters from the original NES Mega Man game. He was designed by Dr. Wright and reprogrammed by Dr. Wily.
Fire Man ambushed Kevin, Duke, Princess Lana, and Mega Man as they made their way to the end of Cuts Man's stage. He was destroyed by a single blast from Kevin's Zapper.
Along with the other Robot Masters, he was later recreated with the power of the Three Sacred Treasures, but destroyed again by Kid Icarus' Fire Arrow.
Aside from some color variations, Fire Man's appearance in Mega Man is very similar to his appearance in Captain N.