Fire

Fire (ファイア Faia), Fira (ファイラ Faira), and Firaga (ファイガ Fairaga) magic are attacks used by Sora, Donald, and other characters and enemies that utilize the element of Fire. In Kingdom Hearts, using Fire magic will make Sora shoot a fireball straight forward from the tip of his Keyblade and it has an MP cost of 1 Charge Gauge unit. The fireball has slight homing properties, meaning it can arch in any direction, however, the arch is rather large. In Kingdom Hearts II, Fire acts as a shield that forms around Sora and attacks any enemies that comes in contact with it; useful until acquiring the Reflect spell.

Fire magic will be usable again in Kingdom Hearts: Birth by Sleep. It seems it can be used as both a fireball and a shield.

Kingdom Hearts
Fire: Granted by Donald after defeating the Guard Armor in Traverse Town. Power equals Max MP+20. Fira: Upgraded after defeating Jafar's Genie form. Power equals Max MP+24. Firaga: Upgraded by the Princesses of Heart after sealing the Final Keyhole. Power equals Max MP+30.

''Kingdom Hearts: Chain of Memories
Fire: Obtained after defeating Axel for the first time. Fira: Stock 2 Fire Cards Firaga: Stock 3 Fire Cards.

Kingdom Hearts II
Fire: Granted after protecting the gate to the village in the Radiant Garden. Fira: Upgraded after defeating Scar (Pride Lands). Firaga: Upgraded after defeating Genie Jafar (Agrabah).

Enemies that use Fire Magic

 * Red Nocturne
 * Fiery Globe
 * Crimson Jazz
 * Jafar
 * Oogie's Mansion
 * Assault Rider
 * Axel
 * Wizard
 * Defender
 * Bookmaster
 * Fat Bandit
 * Volcanic Lord
 * Hades
 * Maleficent
 * Groundshaker
 * Trickmaster
 * Stove

Other Usage

 * In Kingdom Hearts, Fire terms are used to mark the ranks of Engine Gummi Blocks.
 * In Kingdom Hearts II, Fire terms are used to mark the ranks of low-power Blaster Gummi Blocks.

Helpful hints
When Traveling up The Castle that Never Was, an easy way to defeat berserkers and nobodies in general is to use Magnega, jump into the middle of it, and use Firaga.

Trivia

 * The Final Fantasy spell Ardour appearing in FFXII, is among the most powerful fire spells in the series, though it does not, of yet, appear as a gummi block in any of the Kingdom Hearts titles.