Tatepakkan

Tatepakkan (タテパッカン) is a shielded cannon enemy in Mega Man 5. They can only be hit when they raise their shield to fire. They appear in Gyro Man's and Stone Man's stages, the second and third Proto Man's Castle stages, and the first Wily Castle stage. They also appear in at least three colors but there is no difference between them. They are weak to Super Arrow in Mega Man 5 and Beat in Mega Man IV. In Mega Man 5, the Charge Kick is also a good weapon to use on it as it can go straight through its defense and destroy it with two hits, usually hitting them twice with one attack. It is possible to hit through their shields at point-blank range.

In Mega Man IV, the shield hitbox is considerably smaller, so charged shots and several weapons can damage it from below even when the shield is down. Additionally, they can be stood upon without taking contact damage.