Ballonboo

Ballonboo (バルンブー) is a balloon enemy from Mega Man 9 that appears in Tornado Man's stage.

Normally, it will just float up and down and try to fire pellets at the player. However, if the player fires at the balloon, it will burst out of control and attempt to tackle him. Depending on the size of the screen, the Ballonboo may attempt to tackle more than once.

Trivia
Its name is derived from the word balloon (バルーン).