Popo Heli

Popo Heli (ポーポーヘリ) is a shielded flying flamethrower enemy from Mega Man 9 that appears in Magma Man's stage. It's vulnerable at the back but its face shield can be penetrated by the Laser Trident. Unfortuanately, it's very hard to destroy, as they appear from the top of the screen, come over to you, and dumb fire at you. Plus, they often do this while you're on a narrow platform, making it even harder to hit. They're a severe pain in the neck if you don't have the Laser Trident.