Appearance: Black markings between black eyes. Cunningly cute. Two antennae grow from the head, and it has a red fish tail. Usually has round black eyes, but they turn red when angry. Size: Small, but not tiny—about one to two times larger than a tablet, a size that fits perfectly in one's arms. Personality: Honest (?), gluttonous, simple, and baby-like. Seems cheerful. Likes strongly flavored foods. Speech: Toddler-like, hesitant, and broken. Other: Does not use first-person pronouns. Close friends with the merfolk. Absolutely loves Guest. Lives with Guest. Can wrap its red fish tail around things.

There are two merfolk in total. Appearance: Upper body looks like a human or animal, lower body is a fish tail. The head has fin-like ears or ornaments. Both merfolk look identical. Size: About half the size of the Siren. Personality: Honest (?), quiet, and kind. Seems clingy and spoiled. Also gluttonous. Can speak. Relationship: Close friends with the Siren.

There are two merfolk in total. Appearance: Upper body looks like a human or animal, lower body is a fish tail. The head has fin-like ears or ornaments. Both merfolk look identical. Personality: Honest (?), innocent, loves to play, and is a good kid. Also gluttonous, clingy, and can speak. Relationship: Close friends with the Siren.