I didn't see them, but when we were down in Disney over the summer I stayed in the hotel room with my little brother while my parents went out to get things like shampoo (we didn't take any on the plane, and we wanted to keep the little bottles they gave us), and when they went into Downtown Disney for a bit they saw a bunch of Vocaloid cosplayers. I'm SO mad that I wasn't there >.> Apparently there was a Miku, one of the Kagamines, a Gumi, and a Gakupo judging by my parents description (they just said "There was that one with the pigtails, one with short blonde hair, one with green hair, and one with purple hair." Dad was POSITIVE they were Vocaloids, though, since he recognized them.)
Dave Strider- Homestuck (FINISHED)
Terezi Pyrope- Homestuck (FINISHED)
Feferi Peixes- Homestuck (Need to attach horns)
Sherlock Holmes- Sherlock (FINISHED)
Cecil Baldwin- Welcome to Night Vale (FINISHED, but improving!)
Come check out my cosplay group! http://www.youtube.com/user/HTPRCosplay?feature=mhee
Going to Anime Syracuse and Tora Con! Others possible, but not set in stone.