Tatebo

Tatebo (ターテーボ) is a cannon enemy in Mega Man 6 that appears Knight Man's stage, the first stage from Mr. X's Castle and the first two Dr. Wily stages. Tatebo is an improved version of Tatepakkan that shoots at an arc and, once its shield is moved up, shoots straight. It can only be hit when the shield is not in front of it.

Trivia
Tatebos can be seen in the exterior part of Blade Man's stage in Mega Man 10.