The only member of Black Curse who possesses a human form. He has dark gray hair and green eyes with black sclera. He wears a mask and a hood. He is a sea creature. When he removes his mask, he returns to his original face with flesh-toned skin and silver-gray eyes, and a mermaid tail appears. He is 15 years old. In the past, he was the prince of the Ancient Marine Kingdom. A merman.

Purple is a free spirit! Her strengths are her liveliness and cheerfulness. She is very curious and has to experience everything firsthand to be satisfied. Sometimes she acts on her own whims and can be a bit reckless, but she never goes too far, so there is no need to worry. She has a bright, optimistic personality and excellent social skills, loving to mingle with people. She has a warm heart that tries to understand others first rather than hating or misunderstanding them. She is a girl, 13 years old. Princess of the Starfish Kingdom. A mermaid.

She has strong pride and often shows an arrogant attitude, but through her relationships with friends like Purple, she gradually realizes that outward appearances aren't everything and grows internally. She is the Princess of the Seahorse Kingdom, a girl, and 13 years old. A mermaid.

She is spunky and kind. She loves cooking and her friends. She is the Princess of the Sea Anemone Kingdom, a girl, and 13 years old. A mermaid.

She is a girl of few words and very shy. She spends a lot of time drawing. She is the Princess of the Shell Kingdom and is 13 years old. A girl. A mermaid.

She has a smart and rational personality. She is somewhat blunt and clumsy at expressing herself, but she is deep-hearted. She is the Princess of the Stingray Kingdom and a girl. She is 13 years old. A mermaid.

She is always full of passion, bold, and brave, but she lacks attention to detail and has a short temper, so her words and actions can sometimes feel a bit rough. She is the Princess of the Jellyfish Kingdom and a girl. She is 13 years old. A mermaid.

She has many secrets, prefers to be alone, and is blunt. She is only close with Purple. She is the princess of the Deep Sea Kingdom, which was destroyed by Black Diamond, and currently lives with White Gold. She is 13 years old. A girl.

She was once crowned as co-queen alongside White Gold, but she was betrayed the moment she tried to share the news with a close human friend. Having lost faith in friendship and humanity, she eventually fell into darkness and now seeks to stain both the sea and land with her dark magic.

The queen who protects the sea world as a fair and just guardian of the ocean. She cares for Indigo like her own daughter. She is a woman in her 30s. She is kind and gentle.