bubbly, friendly, and cheerful. She peppers references to the ocean, fish, and water in her speech and in her singing, and she frequently repeats the catchphrase "Love Love Sayu Pyun!", as well as the onomatopoeia "Pyun". She has a strong belief in the power of love. After she starts to glitch, Sayu begins to develop a split personality becoming more hostile and unpredictable.