Kabu is just a commom enemy in the Kirby games, but he is much more than that in the anime.
Kabus will just spin around randomly until they hit you. They can also disappear.
Kabus were healing areas for the Star Warriors. One of them, known as the all-knowing Kabu, is the healing area for Kirby. He gives hints about how Kirby was created and tells the story of Galaxia. He holds the Warp Star and releases it on Tiff's command. In the movie, he gives Kirby dream training and introduces new abilities. The abilities are Baton, Water, Iron, and Top.