The Kingdom Key, the primary weapon used by the majority of the characters in the series.
The Keyblade is one of the prime materials of the Kingdom Hearts series. A mysterious weapon with extraordinary abilities, it displays the visage of key on the tip of the blade, as well as a keychain attached on the hilt. The Keyblade has been wielded by various heroes throughout the series. Started by Sora, it has been used by other characters, including Riku, Mickey Mouse, Master Xehanort, Terra, Aqua, Ventus, Roxas, Xion, Kairi, Lea, and many others. The Keyblade is amongst the weapons used by hero and villain forces in the series of the villain wars.
A list of other keyblade weapons, found in the Kingdom Hearts video game series.