Met

Mets are enemies in the Mega Man series. They got the word from Hel'met

Met
A Met is a helmeted enemy which walks like a Goomba. Mega Man must shoot it once to defeat it.

In Super Adventure Rockman, Mega Man ignored a Met family with a mother, father and baby Met.

Flying Mets
Flying Mets appear in some stages, like the one in Nitro Man's stage and when he hears a large truck honking, Mega Man must shoot up to defeat it.

Metty
Metty is a large Met. He is the boss in Wily's Fortress. Mega Man must shoot him and slide to avoid the jumping.

Other Media
The Met only appeared in The Beginning. He is an anti-villain and works for Roll. He talks by making funny sounds. His models were later used for Eddie.