In the Kirby series, transformations are forms that Kirby can take that change his appearance and abilities. These differ from his usual Copy Abilities in that he does not need to inhale any enemies to gain them, and rather than changing color or gaining a hat, his entire body is changed into a different form. Transformations first appeared in Kirby's Epic Yarn and have since appeared in Kirby and the Rainbow Curse and Kirby's Extra Epic Yarn as well. Transformations have so far appeared only in games where Kirby does not have access to his usual Copy Abilities.
Allows Kirby to break blocks he couldn't using the yarn whip.
Kirby takes on one of these forms after touching a Metamortex. The Tankbot, Off-Roader and Spin Boarder forms have two players sharing control, with the one who grabbed the Metamortex taking on the main form and the other player providing support, while all the other forms have Kirby and Prince Fluff transforming separately and giving players independent control. The train form is the one special case where players take turns drawing tracks, but Kirby and Prince Fluff share the same train.
In alphabetical order:
Kirby's speed underwater is unmatched while in this form, and he gains a powerful surge attack. Kirby can swim up waterfalls, jump out of the water, swim through hoops to get beads, and bounce balls on his nose.
Kirby pilots a large robotic tank with light-up eyes. It can hover a short distance, and shoots Missiles. When there are 2 players, the tank gets a boxing glove as well, which is controlled by whichever player did not grab the power-up.