Mousubeil

Mousubeil (マウスベール) is a small robot mouse enemy introduced in Mega Man 5 that is used to search for Mega Man. They slide low on the ground, making it difficult to hit them, but a charged shot or Special Weapons like Napalm Bomb, Crystal Eye, Napalm Bomb and Gyro Attack can reach them if Mega Man is on the same ground level as them, or attack from a different ground level if possible. In Mega Man 5 they appear in Stone Man's, Charge Man's and Crystal Man's stages, and in the second Wily Castle stage. They appear in Charge Man's stage in Mega Man IV and Stone Man's stage in the Game Gear Mega Man game.

It Super Adventure Rockman, a Mousubeil reveals Mega Man's location to Dr. Wily.

Other media
Mousubeil appears in the first episode from Mega Man: Upon a Star, being one of the robots that attacks an amusement park in Japan and combines into Samurai Man.

Trivia

 * Mousubeil's name is derived from the words "mouse" and the Japanese word "suberu", which means to slide.