Kingdom Key Zero

The Kingdom Key Zero is the default weapon of Johnny Madman. As his default weapon, it is the weakest weapon of his, but it can be upgraded.

Trivia

 * If you try to synthesize the upgraded version before you find the false materia, Johnny will say that he doesn't have another materia to spare, even if he has found the White Materia.
 * The namesake of the Kingdom Key Zero is based on its color. In Kingdom Hearts 358/2 Days, default weapons are always grey. As there is no weapon panel equipped, you have zero abilities.