That pretty much seems to be the theme of these characters I've been drawing ...
This guy's a master firebender, no kids or family, probably been living in one of the colonies for a short time, a few months maybe. Comes with nothing but his determination and the clothes on his back - it's probably because he was kidnapped.
References:
posereference.tumblr.com for the pose and face
an old reference I can't track down for the arms