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MarinA mermaid who becomes the Priestess of the Sea, Marin is also Urin's big sister. Marin is outgoing, positive, and cheerful, and will freely hug anyone she meets, declaring that she loves them. Marin is full of compassion for others, and seems to be a perfect example of Incorruptible Pure Pureness. Whether that's true or not is soon tested.
Kanon MiyamoriA high school student who becomes the Priestess of the Sky, Kanon has lived with an "evil aura" surrounding her whenever she's flustered or upset. Because of this she is often gloomy, unsure of herself, and unwilling to connect to others. The Elder Turtle feels she would easily fall into darkness.
UrinMarin's little sister and the catalyst for Sedna's release. Urin is not at all happy with going to the surface world, and would much prefer it if she and Marin went back to the sea. She is fiercely loyal and protective of Marin, and Marin's friendship with Kanon makes her worry that she will be forgotten about—feelings Sedna is happy to exploit.
SednaAn evil force intent on shrouding the world in darkness. Sedna was sealed away in two locations, one in the sea and one in the sky. When Urin accidentally frees her sky half, her power is partially restored, and she sends creatures to attack Marin and Kanon while she works on freeing her sea half. Sedna has no real body, and she soon begins looking for a suitable host.
Matsumoto, the Elder TurtleAn ancient sea turtle who taught the previous priestesses long ago, and guides Marin and Kanon. He is very wary of Kanon and her evil aura, and is intent on making sure she does not fall into darkness any more than she already has. Often blunt and to-the-point, he is dismissive of Urin and entirely focused on what has to be done to stop Sedna, even as the situation changes. He has a daughter named Ichikawa.