King Flyer (キングフライヤー) is a giant fly Mechaniloid that appear as a sub-boss in the Mega Man ZX series. It's operated by remote control and uses a special chemical fuel called Methanhydrate (メタンハイドレート a mistranslation of methane hydrate). It was put into production a short time before Mega Man ZX and only a few exist. In Mega Man ZX they are green and in Mega Man ZX Advent they are blue.
Fly Chopper
Fly Chopper, known as Fly Copter (フライコプター) in Japan, is a small fly Mechaniloid released by King Flyer in sets of three. In Mega Man ZX Advent they also appear without the King Flyer.