I actually like the Kingdom Key. To me it represents when i first started the series. If I had to choose a different key blade, I would choose Roxas dual wield. This might not count as a keyblade, but in a way it is a combination of Roxas and Xion. Plus it's really cool.

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"All the world needs is me. I've got my values...So you can keep yours, all right?" - Neku Sakuraba