Oh shit, I discussed this a lot with a friend one day, and it was hard. We both agreed a Touhou/Homestuck remix would represent me well, but fuck trying to find someone crazy enough to be part of two of the weirdest fanbases ever AND that makes remixes.
Instead, my theme is totally Zero's
LATEDIT: Browsing through the Homestuck albums, I found a song that sounded extremely familiar to the point where I felt stupid for not recognizing it. It was Heir Conditioning, and it is a remix of Cirno and Utsuho's themes. And it's fricken epic. That shall now be my theme song.