1. How long have you been on DeviantArt?
My account was made 4 years ago, in October 2010, but I spent time on DA for a lot longer than that. My account was actually just made to make a comment on someone's deviation, I never really planned to post my drawings on the internet before that. But I can't remember when I started going on DA, the farthest I can remember is in 2008.
2. What does your username mean?
Koakuma means "little devil" in japanese and 666 is the number of the demon. The 666 is actually here because the username koakuma was already taken. I'm a big fan of Touhou and started using the name koakuma pretty much everywhere.