The Azula ally who primarily uses throwing knives, darts, and shuriken is Mai.
Mai is a Fire Nation noblewoman and one of Princess Azula's closest childhood friends. Unlike Azula and Ty Lee, Mai is not a bender. Her combat style depends on precision, concealment, and an extensive supply of small thrown weapons hidden in her clothing.
The series describes her weapons as throwing knives, darts, and shuriken, which Mai can launch with remarkable accuracy. Her quiet, expressionless manner contrasts with Ty Lee's acrobatics and Azula's firebending, making the trio effective in different ways. Mai's skill is introduced as a practical threat rather than a flashy superpower.
Mai initially helps Azula pursue Zuko, Iroh, and Aang, but her loyalty changes when Azula threatens Zuko. During the escape from the Boiling Rock, Mai turns against Azula and uses her weapons to hold off guards, declaring that her love for Zuko is stronger than her fear of the princess. That moment is a key turning point in Mai's character arc.