I haven't seen Romeo x Juliet or Gankutsuou, but as far as literary animu goes, I think Frankenstein would be epic. They'd have to change Dr. Frankenstein to be less of a pussy though. My mind conjures images of a fucking brutal final showdown where Victor lays the smackdown on the monster and dies in a gar manner to protect his wife. Also, his wife would actually be blood related instead of just adopted. Also the guy at the beginning/end of the book would be way cooler and he and his men would set out after Frankenstein's monster instead of just heading back home. What a fucking cop out. Pic semi-related, sauce unknown.