From WiKirby
Tornado is an ability debuting in Kirby's Adventure which allows Kirby to turn himself into a tornado by spinning rapidly in circles. It is usually acquired from Twister. In most games, the Tornado ability is accompanied by a hat similar to those of the Fire and Ice abilities. This hat, however, is topped with a small vortex, and a green crystal marking the center of the hat. Kirby is invulnerable to enemy attacks, as well as stationary hazards, while spinning and will inflict damage upon anyone he makes contact with. The only disadvantage to this form is that it is somewhat difficult to control. Holding down the attack button while executing this move causes Kirby to gain altitude, allowing him to blow away airborne enemies as well.
Game Appearances
Kirby: Squeak Squad
In Kirby: Squeak Squad, Kirby can cause his vortex to take on an elemental attribute such as fire, ice, or lightning by touching the appropriate element. However, this can only be done once the Ability Scroll for Tornado is found. Also, when the elemental attribute is gained, the vortex nearly doubles in size.