Heero and Catherine?
Well, it's certainly an unusual pairing, isn't it? You don't see these two paired up very often, but just think about it for a second. She helped nurse Heero back to health after his nearly-successful self-destruct attempt. Admittedly, his first word to her was "...Relena?" ^_~ But still, I think you could argue that there's potential there. After all the fighting is over, Heero won't be equipped to deal with a boring, humdrum existence. What could be better to keep the old adrenaline running than the daredevil stunts at the circus? And if things ever get boring, Catherine can always practice her knife-throwing routine on him to spice things up. ^_~