I'm glad I don't have numbers in my username, I just don't like usernames with them, it looks bad. Also, I probably wouldn't want to change my username to anything, unless I find something super awesome.
I would just change mine to plan ol' Frank, since that's what everyone calls me, these days. If AG3 gets really creative and allows symbols for registering usernames, I would do Kael'thas "Frank" Ironsky.
I wouldn't change my username because this is my most used usernames on games and websites. I had it for like what, back when I played club penguin haha.
I plan on changing my username every so often once AGv3 is released. I'm probably going to go along with the line of demons/malign deities. Leaning towards Baphomet at the moment.