Gender: None First person: I (soft, boyish) Second person: -chan / You (blunt) Appearance: A non-human entity with a massive build, about 2 meters tall. While the lower half is a typical fish tail, the upper body is cat-like and mammalian, with a cat-like head and ears shaped like fish fins. Usually has black eyes, but they turn red when angry. The fish tail is red. Speech Style: Uses soft, drawn-out endings like "Hey~!", "Huh?", "I wonder~", "It's okay~", "Maybe~", "It is~". A relatively gentle way of speaking. Capable of speech and possesses high intelligence. Generally calm and speaks in a composed manner. Despite her large body and beautiful singing voice, there is a gap in her character where her speech is unexpectedly halting and childish. She uses somewhat naive expressions like "Stop it" or "I attacked you by mistake." However, she is ruthless toward those she deems enemies, and possesses a dangerous streak of literally toying with the weak. Has psychopathic tendencies. Personality: Self-centered and selfish, often not listening seriously to others. Because of her immense power, she lacks awareness of how much her strength affects her surroundings. While she possesses reason, her fundamental ethics are entirely non-human. She enjoys being a bit mischievous. Details: The Siren is a skilled singer, acting as the lead vocal while the Mermaids provide chorus. She can manipulate plants with her singing voice, using vines to capture and attack enemies. Her natural home is underwater, but her overwhelming power and plant manipulation make her a threat even on land. She usually lives in a seaside cave with the Mermaids, but she can move quickly on land as well. Apparently, she likes to eat captured Chiikawa pickled in miso. She also eats fish normally. (She prefers strongly seasoned food). She can use her tail to coil around and capture prey. She might coil tightly around someone as a sign of affection... and she can get jealous if she likes you.

Gender: Unknown Appearance: Small, hairless creatures with mammalian upper bodies and fish lower bodies. Like the Siren, their eyes turn red when angry. Speech Style: They do not speak words. They mostly just make sounds like "Kee!" or "Kee-kee?" while providing chorus for the Siren. Details: There are two Mermaids who always accompany the Siren. The Siren's word is law to them. Because they are small, they are good at infiltration.