Cure

Cure (ケアル), Cura (ケアルラ), and Curaga (ケアルガ) magic are spells used by Sora, Donald, and other characters and enemies that utilize the element of Plants. Cure magic makes the target recover an amount of lost HP. In Kingdom Hearts Cure acts very much like a Potion; Cura acts very much like a Hi-Potion; Curaga acts very much like a Mega-Potion as it cures the whole party, despite still needing to choose a target. It costs 1 MP bar to use. In Kingdom Hearts II, Cure magic is much more powerful and nearly always fully heals its target as well as allies within the proximity of the deployment. Cure magic further gains an increasingly large area of effect as the spell's level increases; however it also consumes all of the user's MP in one casting.

Kingdom Hearts
Cure: Granted after defeating Clayton and the Stealth Sneak. Power equals (Max MP*3)+9. Cura: Upgraded after defeating Captain Hook. Power equals (Max MP*3)+27. Curaga: Upgraded after talking to Aerith in Hollow Bastion a few times.

Kingdom Hearts: Chain of Memories
Cure: In Sora's original deck. Cura: Stock 2 Cure cards. Curaga: Stock 3 Cure cards.

Kingdom Hearts II
Cure: Granted after completing Beast's Castle Cura: Upgraded after reuniting with Goofy in Hollow Bastion Curaga: Upgraded after completing Hundred Acre Wood

Allies that have Cure Abilities

 * Donald Duck
 * Tarzan
 * Ariel
 * Auron
 * Simba
 * Riku

Enemies that use Cure Magic

 * Green Requiem
 * Crescendo
 * Pete (to a certain extent)
 * Yuffie
 * Clayton

Other Uses

 * In Kingdom Hearts, Cure names are used to mark the ranks of Cockpit Gummi Blocks.
 * Marluxia, XI of Organization XIII, wields the element of flower, which appears to be the inverse of the Cure spell, in that it induces a gradual death as opposed to healing, as evidenced by his boss fights.

Trivia

 * During the Heartless Invasion of Hollow Bastion/Radiant Garden, Aerith is shown using Curaga off-screen to heal an exhausted Yuffie.