Well, it's been a week so I'll post a couple more.
First, he's Rinami, possibly the best Mio cosplayer I've seen yet:
http://mpzerocos.exblog.jp/13453943/
There's also a really good gothloli Haruhi and Yuki pair that was at the same event, but I haven't seen posts about them yet so you'll have to make due with the pictures from the event highlight reel:
http://mpzerocos.exblog.jp/13422980/#13422980_1