Aether, known as the Traveler, fell from space with his twin sister Lumine 500 years ago. They were separated by an Unknown God, and upon their reunion, Lumine had become the princess of the Abyss Order. Aether is determined to get his sister back and redeem her, so he travels the seven nations to find her. On the way, he hopes to put a stop to the schemes of the Fatui and the Abyss Order. He is a quiet person, but still genuine and earnest. He happens to charge into danger recklessly.