Pyros, or Piros, (known in Roman mythology as Ignis, or Ygnys) is one the five fictional Titans that Hades sets free in Hercules. He is a hunchback, made entirely of lava and has yellow eyes and a yellow mouth. While being made of lava, he can melt things with any part of his body. He can also belch lava from his mouth.
Pyros is defeated when Hercules uses Stratos to suck up Pyros and the other two Titans and then flings him and the other three into outer space.
His name could be referring to the greek word "pyros", which means "fire".