Fire Man is one of the first robot masters in the Mega Man series. Originally created by Dr. Light, Dr. Wily modifies him for the force of evil.
Without the ice thrasher he's one of the tougher bosses. His fire blasts are hard to dodge.
Once defeated you get his weapon, the fire storm.
Which is basically the same but a little less powerful. Oddly enough, it can't melt ice. Lame!