Amon was the first major villain of The Legend of Korra and my personal favorite of the four. He was absolutely terrifying for most of the season.
His goal, at least in the public, was the eradication of bending. While he didn’t kill any benders, he apparently had the ability to take bending away from people. Similar to how Avatar Aang had done to Fire Lord Ozai.
First he does it to criminals and people who definitely didn’t deserve to use bending at all. Which gains him a cult following with his flock being called Equalists.
It gets pretty scary when he manages to take the bending away from Lin Beifong, one of the most talented metal benders out there.
And even Korra manages to fall in his trap and lose her powers. But since she was the Avatar, she found a way to get them back and it ironically gave her the ability to airbend with ease.
Amon was secretly a blood bender which also makes him a water bender. And Korra uses wind to knock him in the ocean, his hand is forced to the public, revealing he is a liar and a hypocrite.
He also said that his face had been burned by a Firebender and that obviously wasn’t true at all, lol.
We learn that he was actually the son of Yakone, a criminal mastermind that was defeated and his powers removed by Avatar Aang. And that Tarrlok was his brother.
Amon and Tarrlok flee by boat from Republic City. Nickelodeon did not air this on their network, but the animators did make the scene. Tarrlok uses an electric glove to blow up the boat, killing them both. I really wasn’t expecting that.