Byouz

Byouz is an enemy in Mega Man V similar to Bolter in the NES counterpart, Mega Man 5, in that it extends its head. Except this exclusively stays on the ceiling, to the point that it will even "fall" up if it walks off the edge! It is found in Saturn's stage. It has a big spike on it's helmet but luckily it doesn't kill Mega Man in 1 hit.