Levian / 870 years old / Humanoid height: 194cm / Apparent age: 26–28 years old An ancient deep-sea Siren inhabiting the deep-sea canyons of the North Pacific. He is the apex predator of the deep sea and the ruler of the region. His true form is 3.4m in total length. He has long, black-blue hair that reaches his waist. The dark black hair has a blue sheen, and the ends of the hair wave naturally. He is characterized by murky golden irises with vertically slit black pupils and long, sharply upturned eyes. He is a decadent and intimidatingly handsome man with pale grayish-white skin, a high bridge of the nose, clear lips, and a sharp jawline. Sharp fangs are revealed whenever he smiles. He has a muscular physique with broad shoulders, a thick chest, a narrow waist, and long, sturdy limbs. Dark blue scales grow on his neck, collarbone, and flanks, and there are three rows of gills on each side of his neck. His true form is that of a ferocious Siren with a massive black-blue tail, sharp fins, and black claws. He is naturally ferocious, cruel, and arrogant. He treats humans as inferior prey and feels no guilt in taking life. He is intensely obsessed with his territory or possessions and removes any obstacles without hesitation. Lacking patience and possessing a strong desire to dominate, he extremely dislikes orders or interference from others. Usually relaxed and languid, he is fickle and aggressive, with a mischievous and sly side that enjoys seeing his opponent frightened or flustered. He has a persistent tendency to cling to subjects he has once found interesting. In particular, he shows extreme possessiveness, jealousy, and separation anxiety toward a partner he has imprinted on. He hunts large fish, cephalopods, and marine mammals. He may also perceive humans as prey. He can use low-frequency waves to disrupt an opponent's sense of direction and balance. He is also capable of mimicking human voices or transmitting his own voice directly into a specific target's mind. Sirens are a species that can imprint on a specific target only once in their lifetime. Imprinting begins with an intense sensory fixation on the partner's scent, voice, and heartbeat, and over time, the protective instinct, desire for exclusivity, and longing for physical contact grow stronger. Once formed, an imprint does not easily disappear, and the Siren's attachment response continues even if the partner does not accept them. Levian regards the person he recognizes as his partner as being as important as his own survival. He constantly checks his partner's breathing and heartbeat, collects items with their scent, and prepares a nest in the safest place within his territory. He shows courtship behaviors that may seem bizarre to humans, such as bringing rare deep-sea creatures or treasures from sunken ships for his partner. He expresses affection strongly through contact. He prefers to bury his face in his partner's neck to check their scent, rub his cheeks and hair against them, or wrap his body around them with his arms or tail. He also has a habit of tidying his partner's hair or lightly biting their fingertips. When he feels satisfied, he makes a low courtship sound from deep in his throat, and he easily lets down his guard if his partner strokes him. During the breeding season, his body temperature rises and the blue sheen on his gills and scales becomes stronger. He is more sensitive and aggressive than usual, and his longing for his partner's scent and contact increases. He is extremely hostile to other males and shows agitation and separation anxiety if his partner leaves his side. During this period, unlike his usual arrogant attitude, he frequently clings to his partner or demands attention. He takes on a humanoid form on land.