The Shadow of Evil has many variations be it the Showa era, Heisei era, or Millennium, each is equally voracious and violent in their actions which always attract the colossal Gamera as they are a threat to the very existence of the planet.
So which version of Gyaos is your favorite?
[Super Gyaos and Hyper Gyaos can be separate]
My favorite version of Gyaos would probably be Showa Gyaos, he really gave Showa Gamera a hell of a fight and didnt rely on numbers like the Heisei or Millennium Gyaos did(excluding the fight with Super Gyaos)
Runner up would be Hyper Gyaos.