Kouker Q

Kouker Q (コーカーＱ) is an enemy in Mega Man 5 that was designed after the development of Rembakun. It flies slowly across the screen, but the instant the player is under it, it stalls its engine, folds its propellers, reveals its spikes underneath, and dives like a weight. The spikes won't kill Mega Man in one hit, but they are often placed where platforms drop into bottomless pits. It is found in Gyro Man's stage and the third stage from Proto Man's castle.

Other Media
Kouker Qs make a brief appearance in the first episode of Mega Man: Upon a Star as one of the robots that form Samurai Man.

Trivia

 * Kouker Q's name is derived from the Japanese word "kyuukouka", which roughly means "nose dive".
 * Even though there are spikes on them, they do not instantly kill.

Similar enemies

 * Rembakun
 * Crusher