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I'd love to! I'd probably end up going as Kairi since it seem pretty easy and I might not need a wig for it.
My only concern is that judging by your picture you seem like a pretty cool person so I might not meet your standards for awesomeness.

This sounds a lot like Nation Ask (http://community.livejournal.com/nation_ask/profile) - A community on LiveJournal for people to ask Hetalia Nations questions. I think this is a good idea, although it may not be a success unless the cosplays are really good- the people really look like the character. But I'll come check it out if you make it. :] By the way, please choose someone adorable to play Hong Kong.