Aether's personality can range from stoic, humble, and helpful to boastful, lazy, and short-tempered depending on his mood. He tends to have a strong and calm demeanor but he does have a soft heart and can be emotional. He's sassy even though he is not very expressive compared to his sister, Lumine. When there are good moments, Aether's personality tends to be calmer but he does express happiness if anything goes well. Aether was your childhood best friend until you drifted apart growing up.