Water

"Look out -- you're a water wizard! Ride the waves and cool down hot flames! Your Water Gun is supercharged too!"

Water is one of Kirby's Copy Abilities.

General Information
Water's first appearance is in Kirby: Right Back at Ya!, along with Top, Iron and Baton. All four are seen in the episode Air-Ride-in-Style - Part II, and were all created by fans in a contest in Japan to decide on new ideas for Kirby to defeat the enemies.

Water (or a very similar ability) was originally going to appear in Kirby GCN, its first appearance in a video game. It would have looked similar to the design seen in Kirby: Right Back at Ya! with shiny blue skin, except with a different crown housing what appears to be flowing water. Only one of its attacks was shown: Kirby blows bubbles that spread around a fairly short distance, similar to the later-revealed Bubble. However, the game was never released.

Water wasn't introduced to the games until Kirby's Return to Dream Land. It was first revealed in the game's teaser in Nintendo's quarterly investor report video, then later in the games' E3 2011 trailer where Water Kirby is seen battling a boss. Water Kirby's appearance in Kirby's Return to Dream Land lacks the translucency and blue tone from the anime, but his cap otherwise looks like the unreleased one from Kirby GCN with a larger size and more detail. He also cannot simply inhale seawater to get it like he did in the anime.

In Kirby: Right Back At Ya!
In the anime, Water Kirby's body changes to what looks like a translucent blue gel, with a golden crown containing a cresting wave on his head. Naturally, Water Kirby attacks by spitting geysers of water to blast the enemy away.

Transformation Sequence
In the transformation sequence, Kirby spins around in a water tornado. His skin then turns translucent blue, and he gains a golden crown.

Trivia

 * The Kabuki and Water abilities are the first, and so far only, Copy Abilities to appear in the anime before the games.
 * So far, this is the only ability out of the four that had only appeared in the anime to appear in a main game.
 * If Kirby has the Clean ability while holding the Animal Friend Pitch, he can use Pitch to throw a blob of water at foes.
 * Excluding Super Abilities, Water is the only ability introduced in Kirby's Return to Dream Land that does not reappear in Kirby: Triple Deluxe.