Some good Korra speculation theory that I found in Tumblr. Spoiler "Amon isn’t his real name, but a code name he uses while donning the mask. Amon is secretly a bender, in fact his father is on the council board, and comes from one of the most prestigious families in Republic City. Said father abandoned Amon and his sister at a early age after the untimely murder of his mother. With his sister blind and paralyzed from the ordeal, Amon had to rely on family connections to ensure his and his sister’s safety. Later on, He joined up with the Equalists and with his charisma and a little secretive bending, he was quickly named leader and vowed equality for all in Republic City. In reality, all he wants is to find his mother’s killer and create a perfect world, free from strife for his sister. Now all that stands in his way is the metalbending police force and the Avatar. Also, this isn’t the plot for Code Geass, no sir. Code Avatar: Amon of the Revolution"
I know rite? And at least the person who wrote it got the whole bender thing right. It's a bit true, too, regarding Amon.
