A Minute Bomb has a thin, armless body with short, thin legs without feet. Its head is spherical and is blue, the same color as its body. Its head is covered by two halves of a dark brown 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 bombshell sports a long, white fuse. Its Heartless emblem is present on the front of the top half of the shell.
In Kingdom Hearts II Final Mix, the Minute Bomb's body is black, its shell is white, and its fuse is red.
The Minute Bomb's name obviously refers to its explosive attack method and resemblance to stereotypical bombs. "Minute" could refer to its rather small size, or to the time measurement "minute", which could refer to its fuse, though the Heartless itself detonates far faster than one minute.
Although these Heartless are easily ignored, they have only one attack besides their self-destruction. They will send themselves into a straight line headbutt. Use Guard to block the attack, and break their skull cap. This will make them stand still for the rest of the battle and they will not attack nor use their explosion. If the headbutt is not blocked, it only deals minor damage. If it does use its self-destruct, wait for the Reaction Command "Dodge Roll". If the Minute Bomb self-destructs without the use of Dodge Roll, it will reappear if the player walks away and returns to its location.
In Kingdom Hearts 358/2 Days, however, they will start to detonate if their headbutts are guarded. Also, if Roxas uses fire attacks or magic, it will immediately explode. If the Minute Bomb uses its self-destruct, it will be still and can be moved by hitting it. If the Minute Bomb is frozen while the countdown is going, the countdown stops. Its self-destruction also deals damage to other Heartless as well.