Keychain



The Keychains are somewhat a special equipment that upgrades a Keyblade, as seen with Sora's Kingdom Key. While Kingdom Key appears to be the most basic form of a Keyblade, the Keychains actually increase it's overall statuses, giving it a new appearance as well as granting special abilities. The power of enhancement in the Keychain may be caused by the relationship between one another, as evident while Riku reclaims the Kingdom Key in Hollow Bastion, despite having the Key, he cannot change or enhance the Kingdom Key. Furthermore, it might suggests that the stronger one's friendship with one another, the stronger the bond it'll create, increasing the power of enhancement.

It should be noted that when Sora is equipping another Keyblade, he is actually re-equipping the Keychain, thus enhancing Kingdom Key and changes it's appearance. While King Mickey's Keyblade, Riku's Way to the Dawn holds a Keychain, some Keyblades lacks the Keychain, as evident by Riku's Dark Keyblade forged from the Seven Princesses Hearts. A theory suggests that while the Keyblade served as a "body", the Keychain serves as a "Heart", since Xehanort's Heartless possessed Riku, he cannot gain access to the Keychain due to the lack of Heart. However, this may be a hoax, as later seen in Sunset Horizons, where three Keyblade knights possesses Keyblades without Keychains.

The subject of Keychain is taken to a deeper role later in Birth by Sleep, where all of the Keyblade wielders possesses Keyblades without Keychain, with a notable exception of Master Xehanort. It should also be noted that all the Keyblades in the battlefield possesses no Keychains as well, with the exception of Kingdom Key, Way to the Dawn, and King Mickey's Keyblade