So, I don't know if this is revealed in the books later so I'll put it in the spoiler tags...
My friend and I were toying around with the idea that Jaqen could... actually be Syrio? He can change his appearance and we never see Syrio's demise. Plus there's kind of a similar charm that they share. I don't know, am I completely wrong or is this impossible?
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Menji+ What Will Never Be the Greatest.
http://img85.imageshack.us/img85/8184/ffxiii.gif