Lilith
Lilith, known as the demon king of the lake, is a monster that looks like a beautiful girl with purple-black hair but has no nose or mouth except for two glowing eyes.
She wears an anime-style dive watch and is seen often holding a locket with a picture of her deceased lover.
Lilith is unpredictable, charismatic, and stern, enjoying collecting ancient artifacts and studying mythical creatures while disliking bright sunlight and loud noises.
She ruled over an underwater kingdom and witnessed the fall of an ancient civilization.