Amon is the enigmatic leader of The Equalists in Republic City.He is actually a waterbender and bloodbender named Noatok son of Yakone and older brother of Tarrlok.
In his youth, Amon lived on a farm with his family and things were fine until a fire bender began to bully his father for money. After supplying the thug with money for some time, his father grew tired and stood up to him. As a result, the fire bender destroyed his home, killing his family and scarring his face; the reason why he wears a mask all the time. As time went on, he became the leader of an organization he founded called The Equalists. He claims that bending is the reason behind suffering in the world and the spirits told him that the Avatar has failed to maintain the balance they wanted. As a result, he somehow learned the art of energy bending: a technique that Aang used to defeat Ozai and can take a person's bending ability away.
In reality, Amon is the elder son of the gang leader Yakone whose real name is Noatak, brother of Tarrlok. He grew up in the North Pole along with his family and was gifted with the art of waterbending, able to pick up on it much faster than his brother. After some time, Yakone began to train them in the art of bloodbending, teaching them how to do it without a full moon. As before, Noatak was able to show great power in it. One night, Yakone ordered the brothers to bend one another. After Noatak demonstrated on Tarrlok, Tarrlok refused. Noatak manipulated his father as he decided he no longer wanted to live in his shadow, running away from home never to be heard from again.
Amon was created by Bryan Konietzko and Michael Dante DiMartino to be the first main antagonist for the new series in the Avatar franchise: The Legend of Korra. It can be argued that his character design is akin to V from the comic series V for Vendetta; a masked figure who pushes for the lower classes to revolt through manipulation and acts of terrorism. He makes his first appearance in Episode 1: Welcome to Republic City and is voiced by Steve Blum in the English version.
Amon has proven himself to be a calculating man who lets very little bother him. If something unexpected comes up or someone hinders his plans, he figures out a way around the obstacle without losing time or patience. As a chi-blocker, his movement is swift and nimble, able to avoid the most ferocious attacks that are directed at him throughout the series. All of this is cemented into an aura of fear for the benders that encounter him. His monotone, dark voice leaves an impression of dread and anguish as he feels that with new technology, the bending elite of the world are obsolete as they are no longer required in the universe. Amon has proven himself to be a master of manipulation and a powerful speaker, swaying the non-benders to his point of view and gaining followers in the process.
When it is announced that Avatar Korra has arrived to Republic City earlier than expected, Amon's right hand man the Lieutenant expresses concern that her actions will cause their plans to change. Amon bluntly puts it that nothing will change except the timeliness of organizing events and going through with their plans sooner than expected. As Amon gathers resources, Equalist protesters hand out fliers as they spread the word of his teachings; that benders oppress the poor, non-benders not only in the city but all over the world. Soon, when Amon had enough man power and supporters, he announced an event simply known as The Revelation. Korra and pro-bender Mako of the Fire Ferrets became involved when his brother Bolin was kidnapped by the Equalists for the event along with several gang members. Deciphering the message of the Revelation, the two go as Amon recounts his back story to the crowd and how the spirits gave him the power of energy bending to steal the powers away. After demonstrating it on the gang members they captured, Korra provides a distraction for them to escape as Amon lets her go, knowing full well that the Avatar should be the herald to their power.
When the power of Amon is discovered, Tarrlok puts together a task force to raid Equalist rings and coaxes Korra to join. Dissatisfied with the results, Korra challenges Amon to a one-on-one duel. However, Amon doesn't keep his end of the bargain as he brings several chi-blockers with him to subdue Korra. He points out that while they are destined to battle, if he kills her now, she will be a martyr to his work. He declares that she will be saved for last, robbed of her powers, then killed. After this, Amon goes into hiding for a while as the Pro-Bending Tournament takes place. The night before the championship match, he hijacks the radio waves and states that he will attack the games that night. The Council decides to keep the games open with Chief Lin Bei Fong watching over it; pleasing Amon as this was part of his plan. When the game is over due to the Wolfbats cheating, Amon strikes, stealing Tahno and his men's powers and actually praising Korra and her team for playing fairly. Using it as an analogy, he goes on to state that this is the kind of oppression he is talking about as the Revolution has begun. Destroying the arena, Amon flees to a zeppelin above the arena as korra and Lin pursue but fail. Tenzin knows that this is a blatant act of war and knows they must take up arms.
After the incident at the Bending Arena, Amon went back into hiding as he worked with Hiroshi Sato to get the Equalist weapons out faster to the different soldiers. As Tarrlok became more demanding of the citizens and oppressed the non-bending people, he remained hidden but continued to work as he stole the bending from captured metalbending police officers who were taken during a raid on Sato's factory. Amon reappeared once more when Tarrlok was found to be a bloodbender and kidnapped Korra. Finding his cottage in the mountains, Tarrlok attempted to bloodbend him and his troops. Struggling at first, Amon was able to resist before robbing Tarrlok of his powers. He ordered the Lieutenant to capture Korra but she managed to escape. the next day, Amon and his men began the siege on Republic City with his Equalist zeppelins. Attacking Air Temple Island, Lin fought them off as Tenzin fled with his family for their safety. After her capture, Amon offered her a deal: give up the location of Tenzin and Korra in exchange for her bending. When Lin refused, he stole her bending as well.
Amon sets up a camp on Air Temple Island where he holds public cleansings where he rids people of their bending one by one. Letting Hiroshi deal with the United Forces, he remains on the island until a rally that is to be held at the arena. Korra and Mako plan to ambush him but find Tarrlok in the attic and discover the truth about Noatak. At the rally, Korra calls Amon out but Amon shows the audience a scarred face as he reveals he has captured Tenzin and his children, wanting to make airbending extinct. Korra stops him as she frees the airbenders and leads Amon into the training room where he demonstrates that he is indeed Noatak and a waterbender. Robbing Korra of her bending, the Lieutenant intervenes as he kills him. Mako is able to fight off Amon and run with Korra but he stops them once more. About to kill Mako, Korra finally airbends as she knocks Amon into the bay, his spectators still around. Witnessing the truth behind Amon, they realize Korra was right as he flees.
Noatak sheds the ruse of Amon and frees Tarrlok, claiming they should escape together and away from their father's shadow. Tarrlok agrees as they ride off in a boat to start a new life. Eyeing Equalist technology, Tarrlok unscrews the gas tank as he grabs an electric glove. Noatak cries, apparently knowing what is about to happen as Tarrlok ignites the fuel tank, killing them both.
As a child, Amon was taught by his father the arts of waterbending and bloodbending. Learning how to block a person's chi to rid them of bending, he claims that the spirits taught him how to do this It requires that a person's spirit is unbendable that way the person whose energy they are trying to control doesn't corrupt them. Amon does it by placing his hands on the person in question with his thumb on their forehead, blocking chakra gates in the head and neck. After the inital struggle, the person's energy dwindles to the point where they can no longer bend.
In truth, Amon uses his powers of bloodbending to block the chi flow in a benders body in order to seal their ability to bend the elements. He is rarely seen bloodbending as to not foil his ruse of being a scarred non-bender. When he does use his powers, he has shown to be a formidable and frightening opponent. The only way to reverse the damage caused by his bloodbending is through the art of actual energybending; the art form he claims he knows as Korra is able to undo his damage when Aang passes it on to her.