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A Storm Bomb has a thin, armless body with short, thin legs without feet. Its head is spherical and is black, the same color as its body. Its head it covered by two halves of a turquoise shell resembling a stereotypical bomb. A large, jagged opening around the middle of the shell exposes the Heartless's glowing, yellow eyes. The top half of the bomb shell sports a long fuse that is black on both ends. Its Heartless emblem is present on the front of the top half of the shell.
The Storm Bomb are relatively easy to destroy, vulnerable to both physical attacks and offensive magic. They possess only two attacks, a spinning headbutt and a devastating explosive tactic. While the headbutt can be avoided via Dodge Roll, Block, or even a colliding physical attack, the Storm Bomb will also prepare to explode as a result. Once a countdown begins over the Storm Bomb's head, Roxas should avoid being sucked into the explosion by the whirlwind these Heartless surround themselves with.
Roxas can use Glide to escape, should this occur. If enough time remains in the countdown, Roxas can also use a physical attack to knock the Heartless away, or to quickly destroy it if it is low on health. Otherwise, he will have five seconds to get out of the explosion's range. The Heartless will then detonate, automatically destroying itself regardless of its remaining health.