1) Does the avatar symbolize something?
That I'm also a kind-hearted ditz with very special hobbies.
2) Why did you pick it?
'Cause I freakin' love Valkyria Chronicles... Welkin and I got somewhat similar way of thinking, and I started crying in quite a few cutscenes in the game... (The game is better than the anime in my opinion, storywise).
3) Will you change it anytime soon
I highly doubt so. I like consistency. (I've only had 2 avatars in my time here, my first one which I changed rather quickly (a picture of Rukia from Bleach with a lolface drawing in her hands), and then this one with Welkin).
4) Who has the best/worst/creepiest avatar?
This is a tricky one... There's just so many people with great avatars around here, I simply can't choose!