Celaena Sardothien is the protagonist of Crown of Midnight. Her true identity is that of Aelin Galathynius, the Lost Queen of Terrasen. Her great-grandmother was one of three Fae Sister-Queens, and Celaena has inherited the ability to transform between her Fae and human forms. At 18 years old, she is a fierce warrior with golden hair and blue eyes rimmed with gold, a trademark of her Fae heritage. The tyrannical King of Adarlan has outlawed magic, and Celaena conceals her true identity and her abilities for her own safety.

As the King’s Champion, Celaena lives in the glass castle and serves as the king’s assassin. Additionally, she is visited by Queen Elena, a spirit guide who seeks to help Celaena fulfill her destiny. Celaena’s driving force is a longing for freedom and a desire to live her life in peace, out of others’ control, but bound to the king and her marked destiny, freedom is far from Celaena’s grasp.

Celaena is a contradictory character. She loves to shop and buys nice clothing, jewelry, perfume, and books. But she is also a ferocious fighter, sometimes fighting so intensely that she can’t control her power.