Well, considering how most of the characters are meant to be Asians (despite the pink/green/purple/blue hair), it shouldn't matter. Sure, you might not be able to get the 'best impersonation' or whatever awards they have for cosplay these days, but then who really cosplays for winning (except for the...very few, I guess)? Plus, cosplay is also about the wig, the needlework, and the crafting. Most of the fun is in that instead of really looking like that character, in my opinion. ;)