I think I have yet to check a fandom out just because a popular pairing is my kind of ship or it just looks pleasing. I can't ship until I know the characters well, and it's not my priority when enjoying a canon ^^ I'm more plot and character driven.

It is pretty weird, but a big part of the fandom is all over medicine seller/his other self O_o Even if it's physically impossible, that we know of. (Hell, he might not even have a separate personality like Yukito and Yue or all those Yu-gi-oh characters; we can't tell at all what his other self IS.)