In the long lost years of 1999 or 2000 I was obsessed, and still am to be honest, with a wonderful JRPG called Legend of Dragoon. When my older cousin helped 9 or 10 year old little me make my first email it was the first thing I thought of. Of course it was taken so we added 13, the day of my birth, on suggestion of the site and then that ended up being taken so he just tapped 0 and it stuck. Then as I got older and began to study history and especially the history of our tribe I began to love the real world concept of Dragoons. So it's just kind of followed me since. All my characters have traditional names too but thats how my username came to be.
As for my avatar, it was just kind of a panic choice when I signed up long ago and I couldn't find anything more fitting. Since having to leave the hobby for life reasons and finally being able to get back to it after things settled and I could afford hobbies of any kind again it's gained a strange nostolgia factor for me so I haven't changed it.