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Luchia the Princess of the North Pacific Ocean

Luchia is junior high school student who is both blessed, and cursed, with the same personality characteristics that befall almost every shoujo heroine: a simple heart, and a simple mind. Fortunately, Luchia also has courage and determination in abundance. She lives and works in the public baths, Pearl Waters, along with her "older sister" Nikora, and her guardian penguin, Hippo.

Luchia is actually a mermaid, or more specifically, the Princess of the North Pacific Ocean. When she was six years old, Luchia gave her pearl to a boy that she saved from drowning. When she turned thirteen, however, she was forced to assume a human form, show up on dry land, and search for her pearl. Nikora explained that Luchia needed her pearl in order to become an adult; and in the mermaid world, thirteen is considered the age of adulthood.

But Luchia is more than just a mermaid princess. Using her Pink Pearl, Luchia can transform into Pink Pearl Voice, and use the power of her singing voice as an offensive attack against the evil creatures of the sea.

At the beginning of the show, Luchia did not know that she was a princess, and Nikora did not explain to her the real reason that she needed her pearl (which would be to summon Aqua Regina). The reason for Luchia being raised not knowing that she was a princess is rather complicated. When Luchia was born, Madame Taki, her kingdom's resident fortune-teller, oversaw the baby princess's birth, as she had so many before. But Luchia's pearl shone with a light brighter than any Taki had seen before, and in that moment, Taki saw Lucia's future, and saw that Luchia was burdened with a "dark and deep hardship." Unsure of what to do, Taki decided to raise the baby Luchia not as a princess, but as a normal mermaid, until the day came when she would be old enough to be told her fortune.

Hanon the Princess of the South Atlantic Ocean

Hanon in some ways, can seem very wise and mature for someone her age, and she certainly considers herself to be quite adult-like and worldly, especially regarding her romantic pursuits. But most of the time, however, Hanon is happy to be a fun-loving, girly person. Hanon lived in an apartment by herself at the beginning of the show, but she later moves into Pearl Waters to share a home with Luchia. Hanon is the mermaid princess of the South Atlantic Ocean. And also the Aqua Mermaid Princess.

Rina the Princess of the North Atlantic Ocean

Rina is the tomgirl of the group. She has a very serious, stalwart personality. She's initially somewhat of a loner, but she quickly learns to warm up to Luchia and Hanon. Because of her beauty, and her cool attitude, Rina has gained the admiration of many of the girls in her class. For some reason, she chooses to wear a boy's school uniform every day. Rina is the princess mermaid of the the North Atlantic Ocean. And is the Green Mermaid. Rina showed up on dry land in order to search for the other mermaid princesses; unfortunately, she also found Kaito whom she was instantly suspicious of, since she (correctly) sensed that he had a connection to Gaito.

Caren the Princess of the Antarctic Ocean

Caren is the Princess of the Antarctic Ocean. Caren is actually Noel's twin sister (the slightly younger twin, to be exact). Noel and Caren were born at the same time and at the same moment, even though they were born at opposite poles of the Earth. Despite the fact that they consider themselves to be twins, however, they have never actually met each other face-to-face. Still, Caren obviously cares a great deal about Noel. When she hears that Noel has been captured by Gaito, Caren vows to rescue her, no matter what.

Caren is a difficult character to understand. She first appears in ep.21, in her human form, when the mermaids entered a contest (Rina only entered because the grand prize was a flat screen T.V.). She also seems to have a mysterious interest in Mitsuki-sensei.

At first, even though Caren will not fully reveal herself to the other three mermaids, she still appears willing to help them out from afar.

In the ep.26, however, when Caren finally does reveal herself as Purple Pearl Voice, she also finally states that she has no intention of becoming friends with the other mermaids. She blames them (especially Rina) for Noel's capture. "I can't believe in any of you," she tells them. And she intends to rescue Noel by herself. Unfortunately, however, things don't exactly work out the way that Caren had planned...

In ep.67 Caren's pet penguin goes to Luchia,Hanon, and Rina for help b/c the ice from Caren's kingdom is melting too fast. They then find out it was all Michel's doing. Then all 6 mermaid princess start singing Legend of Mermaid and got a piece of Seira's heart back.

Noel the Princess of the Arctic Ocean

Noel is the princess of the Arctic Ocean. Noel is actually Caren's twin sister (the slightly elder twin, to be exact). Noel and Caren were born at the same time and at the same moment, even though they were born at opposite poles of the Earth.

At the beginning of the show, Noel had managed to escape her destroyed kingdom, and had finally found another fleeing mermaid princess, Rina. Noel and Rina vowed to search for the remaining mermaid princesses, but at that moment, Gaito and Yuuri caught up with them. Noel sacrificed herself so that Rina could escape. Rina is still haunted with the memory of her last moments with Noel; and Noel, for her part, spends the majority of the show sleeping within Gaito's castle.

Despite the fact that she is Caren's twin sister, Noel seems to be the polar opposite (no pun intended) of Caren in many ways. Noel has a very calm, gentle, caring personality. Rather than leaping into action, Noel instead pauses and reflects before making a decision. The only thing that Noel does impulsively, however, is jump into harm's way if that's what it takes to protect her loved ones. Noel's courage, and capacity for self-sacrifice, are the personality traits that she actually shares in common with Caren.

I think Noel's best friend was Rina (Rina's two best friends are Hanon and Luchia). But Noel's new found friend is Coco.

Coco the Princess of the South Pacific Ocean

Coco is the Yello Mermaid Princess and the ruler of the South Pacific Ocean. Coco was a already captured by Gaito. Coco is a difficult character to understand, especially since she is only active at the very end of the show. She seems to be a very kind, gentle person with a normally bright, sunny personality. She is often visually associated with yellow daisies. Coco is also very brave, however, and very loyal to her friends - loyal to a fault. And Coco's closest, dearest friend is none other than Sara. When she is awoken in ep.50 and realizes that the castle around her is crumbling and that the final battle is occurring, Coco bravely and simply does what she must do.

In ep.64 Coco starts have nightmare all about a shell that belonged to Sara. She then goes to Luchia,Hanon, and Rina for help to find the shell. At the end of the ep. Coco then learns about Seira the new orange mermiad princess.

Sara the Princess of the Indian Ocean

Sara was once the Mermaid Princess of the Indian Ocean and the Orange Mermaid Princess. In the show she was once in love with Mitsuki Tarou. One day he promised he would run away with her. But never came back. Sara thought it was because she was a Mermaid Princess and yelled that she wish she was never born as a princess. This caused a huge wave to hit a ship (at the same time as Luchia and Kaito first met). Half way thought the show Sara learns that what she did was wrong. But she soon fell in love with Gaito. Since she was traped at the bottem of the sea Sara stayed with him and is still alive hearing Seira's songs

Seira the New Princess of the Indian Ocean

Seira is the future Mermaid Princess of the Indian Ocean, the successor who will follow in Sara's place. However, there's just one tiny problem... Seira hasn't been born yet. Before Seira's birth Michel attack her. Luchia has to fight for the fragments of Seira's heart. Seira is still alive because of her orange pearl which Luchia keeps in a box. Slowly Seira learns what happiness feels, sadness, friendship, and etc. In the very last battle Fuku-chan follows Seira and the mermaid princesses down to Earth, and, overwhelming Michel's will, uses the angelic being as a puppet who attempts to hunt down and destroy the princesses and their allies. Even when confronted with an evil, soul-less Michel, however, Seira's heart aches for him. "Michel really truly is a nice person, just like Michal!" Seira tells Luchia. Seira wants nothing more than to save Michel from Fuku; and with Luchia's help, ultimately, the strength of Seira's love for the forlorn angel is enough to do so. It is telling that when his moment of salvation comes, Michel's final words of farewell are to Seira, and to Seira only. "Believe that we will meet again someday..." Seira weeps tears of mixed joy and grief as Michel leaves her. Seira ultimately proves herself a profoundly kind, gentle, yet strong person. Her experiences sharing Luchia's emotions, and then Michel's emotions, have taught Seira many things about the strength of love, and the pain of loneliness. Watching Seira's determination to save Michel during the final battle, Coco even comments, "Sara... The little princess of your kingdom has already become a wonderful friend."