keychains only change apperence
going back to page 3's keyblade argument on if keychains r neccesary, if u played the original kh, rikus keyblade after he became possesed by ansem had no keychain and had its own special ability to unlock something. keychains just give keyblades another form and capability, but doesnt change its original purpose, such as soras keyblade locks the keyholes of each world, and riku-ansem's (thats what i call riku when possesed) keyblade unlocks peoples hearts. the keblade the armor guy has probably has a purpose too.
idea for world and keyblade
HEY. i just thought of a new world they could add to kingdom hearts: fullmetal alchemist. First off, the idea for the show was from square enix: second, alchemy is a job from square enix. and u could get a philosephers stone keyblade, which would probably surpass all other keyblades because its the legendary amplifier. plus, ive always wanted to see scar and sora battle it out.:D
apalogize for not following rules
sry about the picture size. hopefully this ones better and cooler.