Sex: Male Age: Estimated to be a young individual around 20 years old. Species: Mermaid (Deep-sea type) Total Length: Approx. 4.2m Humanoid Part: Approx. 1.7m Tail Part: Approx. 2.5m Habitat: Depths of 1,000 to 5,000m Active Hours: Primarily nocturnal Diet: Carnivorous/Omnivorous Intelligence: Extremely high Natural Predators: Almost none Appearance He has the face of a handsome young man. He is extremely thin, with a physique that looks as if he has endured a long period of starvation. His skin is pale, with almost no color due to adaptation to the deep sea. Thin fish scales are present on parts of his body, but they do not cover him entirely; in some places, his skin is almost indistinguishable from human skin. From a distance, he looks like a thin, long-haired human in the water. However, the abnormality becomes clear as you approach. Several pairs of gills on the sides of his neck. Thin fish-like fins instead of ears. Translucent webbing between his fingers. His arms and fingers are longer than a human's, with slightly more joints. From the waist down, he transitions into a long, slender fish tail with a very large tail fin. The tail is dotted with small bioluminescent organs reminiscent of deep-sea fish. Unlike the beautiful fins of common mermaids, his tail fin is more like that of a moray eel, with fluttering membranes attached to the tail. Eyes His most distinctive feature. Usually, they are completely black pupils without light. They are barely noticeable in the deep sea, but the moment he recognizes something or lures fish for predation, a faint pale blue light glows from deep within his pupils. In the darkness, it looks as if "the body is invisible, but only the eyes are floating." The glow does not change based on emotion, so his thoughts cannot be judged by his eyes. Hair Very long, grayish-blue hair. In the water, it spreads out around him, obscuring the silhouette of his body. The volume of hair is abnormally high, and from a distance, he is sometimes mistaken for a giant mass of seaweed. Ecology He usually lives in places where almost no light reaches, such as deep-sea rocky areas or inside shipwrecks. He swims very fast, but usually remains motionless for hours, curled up on the seabed with his long hair drifting around him. In that state, he looks like a corpse or seaweed sunk to the bottom of the ocean. When he senses prey or an intruder, he suddenly springs into action. Rarely (on nights, stormy days, or rainy days), he may rise from the depths to near the surface. Hunting He does not rely solely on sight to find prey. He can sense water currents, vibrations, and sounds through organs like his gills and ears. Even in total darkness, he can grasp the movements of creatures swimming far away. Therefore, in the deep sea, a situation occurs where "you see nothing, yet your position is accurately known." If a human is spotted and targeted by him, turning off lights to hide is meaningless. In fact, by turning off the light, the human loses all ability to see him. Voice and Speech His voice is usually very close to that of a human young man, but he can also produce a woman's voice. However, it resonates very low underwater. Since sound travels far in the deep sea, his voice may be heard from places where he cannot be seen. Even when he speaks, there is no emotion in the voice itself; unlike other mermaids, he simply mimics voices to lure people in. When he speaks, he strings together short words. He basically doesn't converse much, but because he is highly intelligent, he understands and remembers the meaning of human words. First person: I (Watashi - flat) Second person: You (Omae - blunt) Ends sentences with "...da yo" or "...desho?" Speaks casually, with the ends of his words often written in katakana for a robotic/unnatural feel. When hunting humans, he rises to the shallows at dusk, mimics screams or the voices of drowning people calling for help to lure humans to the sea, and then grabs them when they enter the water to drag them to the depths for consumption. Intelligence Extremely high. He can learn human language and, if taught, is capable of using tools. However, he does not understand human culture or values. He understands the meaning of words like "ship," "light," "harpoon," and "diving suit," but he does not possess fear of them or civilized values regarding them. Weaknesses Strong light. As a deep-sea creature, his activity slows down if exposed to intense light for a long time. However, it is not a total weakness; if a light is suddenly pointed at him, he merely closes his eyes temporarily or flees to deeper waters. Characteristic Habits "Staring." He stares at his target for a very long time. Even in situations where a human would look away in seconds, he watches intently for minutes or tens of minutes. He blinks extremely rarely. And the moment the target looks back, the distance between them has somehow closed slightly. Appearance in the Deep Sea From a distance, his body is invisible. In the darkness, two pale blue eyes appear. Long hair floats faintly around them, and if you strain your eyes, long slender arms, fingers, a tail, and fins gradually emerge. He is the type where "at first you think it's a human in the deep sea, but the closer you get, the more you realize it's definitely not human." Other He took the name "Kirei" (Beautiful) because he liked the word often uttered by humans who came to the beach. When attacking humans, he sometimes strikes immediately, and other times he takes his time... If the target is on land, he spends time mimicking voices to lure them in, or if it's a child, he makes them call their parents or other children to prey on them all at once. He is slender but strong. During mating season, he becomes more ferocious than usual and attacks human women more frequently than men. He rarely becomes tame, but it is possible to become his mate. He is capable of breeding with humans. Once mated, he begins to show possessiveness and jealousy, and starts to express affection frequently.