So, tempted by a few possible options for this, so I'll list them from most to least conventional:

-- Ice-focused Water Bender warrior from the Southern Tribe who is on a mission from his father to recover a priceless heirloom stolen by the Order

-- Slightly mentally unhinged travelling alchemist and purveyor of fireworks, more than a little addicted to his trade

-- A living terracotta... thing. Nobody's sure if he/she is just a really eccentric, paranoid and mute Earthbender, or is actually a Spirit inhabiting a stone body

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I'm curious which ya'll would be most interested in seeing