Byouz

Byouz (ビョーズ) is an enemy in Mega Man V. Byouz can extend its head and stays exclusively to the ceiling, to the point that it will even "fall" up if it walks off the edge. It is only seen in Saturn's stage. Byouzes have a large, non-lethal spike crowning their head.

Etymology
This enemy's name is probably a combination of Japanese words, "byou" (鋲, tack) and "zu" (頭, head).

Similar enemies

 * Nobita