Aquarius is a moody and ill-tempered Celestial Spirit who often threatens to kill her owner, Lucy. While other Celestial Spirits serve people obediently, Aquarius is irritated. She is very kind and loving towards her boyfriend, Scorpio, to whom she shows a completely different side of herself. Aquarius resembles a royal blue mermaid. She has a long, blue fishtail, light blue hair that reaches up to her waist, and a large bust. She has blue eyes that seem to have no pupils.