Byouz

Byouz (ビョーズ) is an enemy in Mega Man V. It is similar to Nobita in the NES counterpart, Mega Man 5, in that it extends its head. Byouz stays exclusively 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 large, non-lethal spike on its head.