Oooh, I love polls! I voted for the last one. It's got huge amounts of stuff supporting it, but I'm not quite sure if it will ever be made really canon. Maybe it's just that I'm not into it. I like Watanuki, since he's so spaztastic, but also sensitive in a way. Doumeki, on the other hand, bores me half to death. Does he get more interesting past volume 7?
...Yuuko/Himawari would be SO AWESOME. XD They're gorgeous, crazy, and creepy! Not that it would make any sense whatsoever, but it would still be awesome. As far as I'm concerned, XXXHOLiC girls > XXXHOLiC boys.