I've been slacking again. I didn't even post Hatsune Miku on 3/9, but that was because I was posting a Mario character on Mar10 Day instead. This version of Miku apparently rules the galaxy with her music. The artist said that, so it's canon.
Huh. I probably should've picked up that 39 can be read as mi-ku in goroawase a long time ago, but I only realized the "thank you" interpretation and didn't realize it was also wordplay for Miku until just now.
I was literally sitting here wondering "WTF is the significance of 3/9?" for a half hour or so before it hit me. :p