Amon is a firebender and he is overcompensating for the shame of killing his family in a bending accident that left him grievously scarred.
You heard it here first!
I'm dead serious about this prediction. By the end of the Book of Air, we'll see Amon bending fire. If it doesn't happen, I'll find a hat and eat it.
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Textures from Lost and Taken: www.lostandtaken.com
Other Korra art:
SUPER IMPORTANT EDIT:
Don't be a dick about spoilers in the comments, dudes. I watched the finale, you don't need to tell me. Don't ruin it for other people!
EDIT THE SECOND: