I think it would be interesting to see which 4 everyone picks. Let me know who your favs are.
Fav Arrancar: Either Ulquiora, Grimmjow or Noitora (Can't choose)
Fav Vaizard: Probably Shinji [Always abused by Hiyori, but then everyone is :-) ]
Fav Shinigami: Either Captain Hitsugaya or Commander General Yamamoto
Overall Favorite Character: Most obviously Ichigo especially with his Hollow Mask