Heh, I was about to post something along the lines of being used to region-specific stuff, but doubting this would be one of those, and for once, I'm glad my feelings were correct as the translations appeared right around the time I was going to post. D:
Anyblue, Stompa et al., where exactly are you reading 'one reward code per character' at?
I'm guessing you mean the pages here, EU and US, which were not created for this campaign in particular.
I could see them giving out an item per PlayOnline account at least, but one per character I doubt. Can't say it's impossible, however, and could see it happening, but yeah... it looks to me like it's one per 'SqEX account'.
That is, one item per Square Enix account, not one code per PlayOnline account, in which case it would be possible to obtain more than one item per one character, similar to the Gobbie Giveaway where players were able to choose a character that which would obtain the pressie.
That said, I do hope it would be one per PlayOnline account at least, but I highly doubt it.
As for the rewards, I guess they're okay even though they're pretty much just for the collector types such as me. The seal/crest ones should have in my opinion been about 3 times as large at least, but yeah, right. I'll very likely go for the Nocturnus Mail, as I got the helmet from a bonanza (twice), but I would certainly have preferred a chance of actually entering the battlefield. >:|