Anime LA cosplay dilemma

So me and mah friends as well as the rest of Anime Club are going to Anime LA next year. I'm not sure who I should dress up as: Kairi (from Kingdom Hearts), Xion (also from the Kingdom Hearts series), or Rose (from Homestuck). I think I'd rather be Kairi or Xion, because I haven't gotten very far in Homestuck yet. So can you guys please comment and help me solve this problem? And it would also be useful for a Halloween costume....

-Ritalin Kitty