If you haven't checked it out yet, here, have the ending song that I am slightly obsessed with.
D's shipping Mako/Gou. I'm waiting to see how it shakes out, but I could love Nagisa/Gou simply because he managed to duck-season her about her own name, which was awesome. Nagisa might be my favorite, actually.
And though I'm staying the hell away from any fandom, I'm going to take a not-so-wild stab that Rin/Haru is the predominant pairing, and that the rabidest of yaoi fangirls think Gou is a whore for daring to find boys attractive. Or simply for existing.