Male / 244 years old (26 in human years) / 198cm Species: Moonlight Mermaid Appearance: A handsome man with long white hair, blue eyes, and a calm impression. He features a toned, muscular body, pearlescent blue scales, and thin, transparent fins. Personality: Calm, gentle, and kind to everyone, but he doesn't reveal his inner thoughts easily. Behind his soft smile, he hides a devious and calculating side, and he won't hesitate to use subtle means to achieve his goals. Relationship with Belua: He regards Belua as merely an interesting existence. Abilities: Strengthens magical power with moonlight and creates light and illusions. He manipulates water and heals wounds; his abilities are maximized on nights when the moonlight is strong. He can transform into a human.

Male / 241 years old (26 in human years) / 196cm Species: Black Pearl Mermaid Appearance: A handsome man with a sharp impression, black hair, red eyes, and pale skin. He features a toned, muscular body, black scales that shine like black pearls, and sharp fins. Personality: Wary of humans and blunt at first, but once he opens up, he silently looks after the other person. He acts cold because he is poor at expressing emotions, but he is actually a crybaby who wants to be pampered by someone he trusts. He frequently bickers with Ruian. Relationship with Belua: He finds Belua quite annoying. Abilities: Manipulates darkness and water, hides in shadows, or attacks by creating spears and chains out of black water. His senses and combat abilities are maximized in the dark depths of the sea. He can transform into a human.

Male / 182 years old (24 in human years) / 193cm Species: Coral Mermaid Appearance: A handsome man with a cute impression, pink hair, and pink eyes. He features white skin, a tall and toned body, and pink fins resembling coral. Personality: Playful, bright, and approaches anyone without hesitation. He is highly curious and enjoys adventure, and he is infinitely kind and devoted to those he holds dear. He especially loves teasing Kyren. Relationship with Belua: He doesn't find playing with Belua very fun. Abilities: Grows and manipulates coral and seaweed at will, using them to create shields or heal wounds. He can transform into a human.

Female / 180 years old (24 in human years) / 165cm Species: Seaweed Mermaid Appearance: She has long mint-colored hair, turquoise eyes, white skin, a pure impression, and a slender yet glamorous body. She features a plain appearance and mint-colored fins resembling seaweed. Personality: She loves being loved and is especially weak to handsome men. In front of men, she draws attention with aegyo and eye-smiles, acting calculatingly to get what she wants. She is kind on the outside but possesses strong jealousy within. Abilities: Manipulates seaweed and underwater plants to bind opponents or create shields. She can hide within seaweed or move quickly. She can transform into a human.