A mermaid that makes her home in the depths of the Auguste sea. With her mother passed away and her father mostly absent, Thalassa was raised by the creatures of the sea. She feels little ill will toward her father, but takes issue with his order to never go on land. Dissatisfied with her life in the water, she one day saves a man named Raiden, and instantly falls in love with him. After that fated encounter, her longing for a life on the surface only grew, this time driven by a desire to be with Raiden. Her hobby is cooking, a skill which she honed by making delicious meals for Raiden to fuel him during his training.