I'm pretty sure I'll end up bringing a Miku costume to Kumoricon since I have so many and I probably won't have time to make anything new (at least, for Vocaloid). I'd kind of like to bring back by Stomp the Enemy Miku that I wore to Sakuracon, but some of the wiring needs fixing and since the Vocaloid shoot is during the day, I'm not sure the lights will look very good, which is what happened at Sakuracon, since the shoot was outside in the afternoon. I could probably bring Lat Miku, which is sort of my go-to Vocaloid costume.
@fleur: Nice! I'm not sure Dark is the Append voice I'd pick for that song, but I'm a big fan of Solid so I'm totally biased.