[@Rex] Just wondering, but did you adapt him from a Serenity RP character?  The picture and, of course, character names made me think of that.  I was in one once, but in never got started good.

The only problems I saw were the names, as they don't fit with the Avatar universe.  The team can still be the Fireflies (after all, there's also the fire ferrets playing) but your name, Malcolm, and Serenity don't really fit.  Other than that it's fine.