Kuvira

She's one of the finest earthbenders in the land, so you'd best not make her angry.

She can use parts of her armor as small
high-speed projectiles when in combat, covering the eyes of her enemies or binding their hands together.

After being abandoned by her parents at the age of 8, she was taken in by the leader of Zaofu, Suyin Beifong.

Suyin trained her in earthbending and metalbending, and she eventually joined the Zaofu Security Force.

She quickly rose through the ranks to become captain of the city's guard.

After the assassination of Queen Hou-Ting, and the chaos that soon followed, she left Zaofu with many of her most loyal guards to stabilize the continent.

At first, she gained massive support from the people of the areas she stabilized, but after some provinces started to refusing to support her army, she took to conquering them.

After the complete stabilization of the continent, she traveled to the great city of Ba Sing Se to attend the coronation of Prince Wu, where she refused to relinquish power and declared herself Empress.