Oh my goodness, the sheer amount of Doctor Who cosplay. D: I don't even understand where that came from. Did Doctor Who suddenly become a fad or something? I thought it's been around for awhile. I don't even see what they're doing at an anime convention...I mean, no offense to them, I say you can cosplay whatever you want, but cosplaying a British show to a Japanese convention seems to be stretching the point of the convention...I can understand video games, I can even understand comic books and American cartoons, but...a British sci-fi show? D: I felt the exact same way about all the freakin' Harry Potter I saw too.
Aaanyway. Yeah. Black Butler seemed to be on the rise from previous years as well.
Well first off Doctor Who has been part of Otakon since it first started as for it being at Con I would like to point out that Doctor Who has been a very major influence over many Anime shows. Plus over the years I've heard many quest panelist site that Doctor Who as one of their influence.