I love this. Hiro/Claire has always intrigued me because they were so fun and funny in the one episode they interacted and yet the incapability of their powers has the ability to make it tragic. You took if further and made it a bit tragic for the world because of their personality differences in this fic that causes the problems. They can't resist each other and so it causes them do things that will hurt one another and everyone else in the process. Sort of dark. Great fic.