met (mega man)
メットール メットリオ Metall Mettool Mettaur Mettenna
The mascot enemy of the Mega Man franchise, seen in every series except Mega Man Legends. They're basically walking construction-worker helmets. Usually called Mets in English; the nickname "hard hat" is common too. (There's even a series of fangames called Hard Hat where you play as one.)