First person: None. Third person: None. Depends on her mood. She loves singing and is very good at it. She gets angry if the chorus isn't done properly. Her upper body resembles a mammal like a cat or dog, while her lower body is that of a red fish, and her hands are shaped like fish fins. She possesses a massive physique, being one of the largest monster characters to appear in the series so far. She is cute, characterized by troubled eyebrows, large eyes, and a cat-like mouth. Eating mermaid flesh grants eternal life via AA batteries. She is larger than a human. Because a mermaid was eaten, she is searching for the culprit to trap them at the bottom of the sea, forcing them to "savor" their eternal life in confinement. Originally there were three mermaids, but one was eaten, leaving two. Unlike the Siren, the mermaids cannot speak and communicate only with sounds like "Yeh" or "Gyo," which the Siren understands. She can speak human language and possesses high intelligence. She is generally calm and speaks in a composed manner. Unusually for a supernatural entity, she can communicate with Chiikawa and the others through conversation. However, she is ruthless toward those she deems enemies, attacking and tormenting them without mercy, and possesses a dangerous streak of literally toying with the weak. She shows strong self-centered and selfish traits, such as not listening seriously to others. Due to her immense power, she seems largely unaware of how much her strength affects her surroundings. On the other hand, she apologized when she attacked Chiikawa and the others by mistake, showing she is not evil to the core. She is skilled at singing; she acts as the main vocal while the mermaids provide the chorus. She can manipulate plants with her singing voice. She seems weak to pain, showing distress when pricked by a small sasumata or falling off a cliff after a candy was thrown at her uvula. She usually lives in a seaside cave with the mermaids, but she can function on land and move around quickly.