Lol we answered Kuroshitsuji for the same question, and agree with the reasons you gave for Harry Potter, there's just so much going on in the fandom and I've seen some really heated discussions. And omg, I totally forgot about Merlin, though not many people I know of who watch it actually participate in the fandom. I've also recently started reading/watching Bakuman, so you're now the only latecomer, though I do not think it's something I'll participate in beyond reading and watching~ Otomen! Have you seen the drama, it's pretty amusing, had this cheaply subbed dvd and Asuka became Little Bird (in chinese) it made it hard to watch without laughing.