Zaheer is the leader of the Red Lotus, a martial arts expert, and an anarchist, who strongly believes in the foundation of a new world without theOrder of the White Lotus, the four nations, or the Avatar. After theHarmonic Convergence of 171 AG, he also became an airbender and, after having let go of his final earthly tether, he unlocked the ability of flight, becoming the second person ever to have done so.
While in pursuit of his goals, Zaheer and three of his comrades were captured and imprisoned in separate, high-security prisons. Upon becoming an airbender thirteen years later, he escaped the custody of the Order of the White Lotus and subsequently freed his allies from prison, including his girlfriend P'Li. He threw the Earth Kingdom into chaos by killing the Earth Queen and attempted to end the Avatar Cycle by killing Avatar Korrawhile she was in the Avatar State. This attempt failed and Zaheer's comrades were killed, leaving him as the only survivor of their group of four.
Following his defeat, Zaheer was once again imprisoned, this time in a new facility near Republic City. To his disappointment, he heard of Kuviraplacing the people of the Earth Kingdom under her military dictatorship, thus rendering his attempt to free them from oppression futile. Because of this, Zaheer helped Korra in 174 AG to meditate into the Spirit World and let go of her fear of him and of "what might have been", hoping that by aiding Korra, she could stop Kuvira.
Focus on the Sound of my Voice and clear your mind. Let the Asphyxiation play out. Accept what happened to you don't fear what might have been. Don't be afraid hold on.
- Beyond the Wilds