"A Keychain (キーホルダー Kīhorudā?, lit. "Keyholder") is a magical piece of equipment that modifies the appearance and abilities of a Keyblade. The Keychains have the ability to change a Keyblade's stats, grant it special abilities, and give it a new appearance. While most Keyblades have a basic form, like the Kingdom Key, a Keyblade wielder can upgrade and change the form of the Keyblade with a Keychain. In other words, when Sora or another wielder is equipping a "new" Keyblade, he or she is equipping a different Keychain to the Keyblade, changing its form." -Kingdom Hearts Wiki, various authors, 2007-2020