Sora will use one of three magic spells, Firaga (ファイガ, Figa), Thundaga (サンダガ, Thundaga) and Blizzaga (ブリザガ, Blizzaga), cycling through them in that order after each use. The current spell is shown in the command icon above his fighter portrait. Whenever the spell cycles, the tip of Sora's Keyblade briefly flashes in the color of the next spell.
Sora begins the match with Firaga, in which he shouts "Fire!" (燃えろ！, Burn!) and fires a straight fireball from his Keyblade. The input can be tapped continuously to perform consecutive shots. Thundaga has Sora lifting his Keyblade upwards and shouts "Thunder!" (雷よ！, Lightning!) to summon three continuous clouds that shoot out a thunderbolt, dealing electric damage to the opponent up to three times. When used in mid-air, its range is decreased. The spell can still miss smaller opponents if they're situated between each lightning bolt. Blizzaga has Sora shout "Freeze!" (凍りつけ！, Freeze!) and shoot out a stream of short range ice projectiles that instantly freezes the opponent if used at close range, similar to Blizzard. All three moves can be reflected, absorbed, or pocketed. Thundaga specifically will be reflected vertically upward and will shoot downward when unpocketed. Only one shard of Blizzaga can be pocketed, making it relatively weak.
The move will not switch to the next spell unless the spell is actually cast. If Sora is interrupted in any way during any spell's startup, Firaga/Thundaga/Blizzaga will remain queued up until casted out. Additionally, this move is extremely punishable if whiffed, regardless of the spell, with Sora being unable to move during the casting and well after the spell is completed, with every one of them having long ending lag.
In the Kingdom Hearts series, magic is a type of skill learned by warriors of light for offensive or supportive purposes based on the limited amount of MPs used in gameplay. Some support abilities like MP Rage and MP Haste are used in combat. The best magic user is Donald Duck, Sora's companion, who has a selection of many spells on his disposal throughout the series. Donald is even the one to give Sora access to the Fire spell in the original Kingdom Hearts, the first of his learned spells, though Thunder has the honor of being the first spell seen in the game (where Donald uses it on a sleeping Goofy to wake him up). Magic comes in three different tiers, denoted by the suffix added to the end of the spell: Level one is simply the element's name (Fire), level two adds "-ra" or "-ara" to the end (Fira), and level three adds "-ga" or "-aga" to the end (Firaga). All three spells shown here are cast at level three. The naming convention itself originates from the Final Fantasy series, where it is standard.
Fire, Thunder, and Blizzard are the three most basic offensive spells and appear in every Kingdom Hearts game, though their effects vary from series to series. In Super Smash Bros. Ultimate, the spells mostly seem to take after their iterations in the original Kingdom Hearts - however, in Smash, Firaga doesn't have a homing capability, simply flying straight ahead similarly to 358/2 Days's Fira spell, and Thundaga launches multiple bolts in a straight line, like the same game's basic Thunder spell. Blizzaga is shown as a flurry of ice, rather than the icy projectiles often seen in the series, though its short-ranged spread shot acts similarly to the original Kingdom Hearts's iteration of the spell, and other Kingdom Hearts games have given Blizzard spells the ability to freeze their targets, as the spell can in Ultimate.
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