The following is a list of characters from the manga and anime series Mermaid Melody Pichi Pichi Pitch. They are grouped according to their roles in the series.
Main characters
Lucia is the mermaid princess of the North Pacific Ocean and keeper of the pink pearl. She goes up to land to search for her pearl which she used to save a boy named Kaito seven years ago. Later in the series, Lucia and Kaito become lovers. She is unaware of the danger in the marine world and of her real mission until she is told of them by her "big sister", Nikora. She is characterized by her cheerfulness and upbeatness, but with having a strong will. In the Pure season, Seira is about to be born as well, waiting to meet Lucia, who has the job of retrieving all the pieces of her heart contained in Michel's feathers. Overall, no matter what the situation, she never gives up hope. Her idol form is Pink Pearl Voice.
Hanon is the Mermaid Princess of the South Atlantic Ocean and keeper of the blue pearl (aquamarine mainly). She is Lucia's best friend, but fights with her like any teenage girl. Unlike Lucia, Hanon goes up to land to escape water creatures. She is perky and flirtatious and a bit more worldly than Lucia, although she tends to be lazy when it comes to cleaning. This worldliness is evidenced by many of her actions—especially by her romantic pursuit of her music teacher, Tarō Mitsuki. In the Pure season, she develops an interest in a boy, Nagisa. Her idol form is Aqua or Blue Pearl Voice.
Rina is the Mermaid Princess of the North Atlantic Ocean and keeper of the green pearl. During school, she accidentally wears the boys' uniform instead of the girls. Initially, she is depicted as beautiful, but stern and bent on revenge for the capture of her best friend, Noel. Later, however, she evolves into a more mature character, and acts as a sister figure to Lucia and Hanon. She eventually becomes close to a boxer, Masahiro. Her idol form is Green Pearl Voice.
Supporting characters
Kaito, the adoptive son of a pair of musicians, is an avid surfer, as well as Lucia's boyfriend. Though he is popular with girls, he is secretly in love with a beautiful mermaid who saved him from a shipwreck seven years ago (caused by Sara when her pearl went out of control), and has yet to realize that this mermaid is Lucia. Kaito kept Lucia's pearl in a necklace until he gave it back to her. Later in the story, it is discovered that beneath Kaito's human exterior lie some distinctively inhuman qualities and that he is the prince of an ancient water race called Panthalassa and is the twin brother of Gaito. Aqua Regina separated Gaito and Kaito to prevent world chaos. Kaito has a hard time when Lucia comes in her human form, because of having feelings for both her human form and her mermaid form. Kaito eventually realizes that the two are one, giving Kaito the ability to love Lucia no matter what form she is in. Dōmoto is derived from KinKi Kids.
Lucia's guardian who serves as her guide. He is shown as Lucia's pet penguin. Hippo accompanies Lucia in her search for her pink pearl, and is among those who voice disapproval of her relationship with Kaito. He is also polite, always putting -さん, -san after every name, even when angry. Later on, he is able to transform into a very cute human boy as well as a legendary creature called a Hippocampus. In his human form, Hippo falls in love with a Dark Lover, Yuri. In anime shows, Lucia and the other five mermaid princess try to get them to meet, even for just a short time. Hippo transforms into a Hippocampus using a key he lost and retrieved while trying to save Tarō from Sara. His real form as "Hippocampus" resembles a unicorn.
Nikora is the virtual manager of the "petit-hotel" on land, where Lucia, Hanon, and Rina work (in the manga, she is the owner of a bath house called Pearl Waters). A purple mermaid, she poses as Lucia's big sister in order to inform her of her mission. She has a crush on Maki, the owner of a bar.
Madame Taki is the owner of the Pearl Piari, as well as the pearl oyster fairy. A fairly major character in the anime who is a fortune teller and friend to the mermaid princesses. Everyone thinks her predictions are wrong, never saying yes when she asks if they want one. Sometimes though, they are right, leaving them astounded. In episode 13, her true form is shown.
Tarō is Lucia's music teacher. He had met a mermaid in the past (Sara), and made a piano piece for her, not knowing what happened to her after their last meeting. In the anime, he was acquainted with Kaito's dad seeking advice on music. Tarō wishes to make amends with Sara. He later moves to Germany after giving Hanon a sheet music as a gift for helping him.
Marine World
Caren is the Mermaid Princess of the Antarctic Ocean, keeper of the purple pearl, and twin sister of Noel. In the anime, she first appears as the winner of a beauty contest that the main trio enters. In the first season, Tarō asks her about his mermaid, and she later blames Rina for Noel's kidnapping. Even after things are straightened out, she chooses to go find Noel alone. She is Noel's polar opposite, having a mysterious personality. Caren and Noel are twins, born on opposite sides of the Earth. Even though the two had not met before, Caren cares most for Noel and would do anything to save her, even if it meant Caren having to find her on her own. While she is cold and distant in the first season, she is found to be wild, humorous, and even a bit strange in the second. Caren finds a boy named Subaru Carraford Hashimoto, a British glaciologist helped resolve a meltdown in the Pure season episode 15. Her idol form is Purple Pearl Voice.
Noel is the Mermaid Princess of the Arctic Ocean and keeper of the indigo (i.e. 藍色, ai-iro) pearl. She loves to read books and is a good friend of Rina. She helped Rina escape from the sea monsters, which led to her capture. She is calm, gentle, caring, and studious. She is Caren's twin sister by about a minute at the most. Noel cares deeply for Caren, the one that she had always wanted to meet. Her idol form is Indigo Pearl Voice.
Coco is the Mermaid Princess of the South Pacific Ocean and keeper of the yellow pearl. She is incarcerated by the sea monsters for most of the first season, so not much is known about her other than that she is a friend of fellow Mermaid Princess Sara and seems to know Lucia's existence. Coco normally worries for her friends, especially Sara and can keep their secrets very well. She is a bit flirtatious, but doesn't have any relationships with boys in the manga and anime. Her idol form is Yellow Pearl Voice.
Aqua Regina is the ocean goddess who guides the Mermaid Princesses. However, this is all that she can do alone after expending a great deal of energy thousands of years ago. She is needed to ultimately stop the sea monsters, and the seven pearls have to be gathered to summon her; Gaito seeks to summon her as well, so that he can use her to destroy the world. Aqua Regina later gives bands to the mermaids to upgrade their singing power; this is signified by adding frills and accessories to their gear. She also upgrades their microphones in the end of season one, before she is finally summoned. At the end of the manga, Aqua Regina has chosen Lucia to be her successor.
Seira is the future mermaid princess of the Indian Ocean and successor keeper of the orange pearl. She appears as an unborn spirit to Lucia in the Pure season, taking the form of a young mermaid. When her time of birth finally came, Michel seized his chance and absorbed Seira into his body, and her birth was therefore delayed until Lucia could retrieve all the pieces of her heart contained in Michel's feathers. Every time Lucia retrieves a piece of her heart from one of Michel's fallen feathers, Seira learns something about an emotion, such as love or friendship. Seira is very child-like and sees the good in Michel, realizing that he has good intentions for the Earth. Once born, she is destined to become Orange Pearl Voice.
Human World The following characters primarily appeared in the Pure season of the anime:
Michal is the girl who finds Kaito after he had lost his memories. She's a rich, yet desperately lonely girl who has lost all hope. She falls "in love" with Kaito to the point that, in Lucia's perspective, he has forgotten his mermaid love completely, and is desperate that he return her feelings. Michal also seems to be a sickly girl, collapsing to the floor every time Michel appears somewhere else or when Kaito is near Lucia (in order to keep Kaito to herself). In the manga, when Kaito states that he loves only Lucia and could never love Michal the way that she "loves him", Michal takes off her clothes and offers herself to him in desperation of keeping him. Kaito turns away from her and leaves. This is a large trigger for her collapses and allows Michel to take control of her. In the end, Michal is reborn and given to her brother to raise her again peacefully.
Rihito is an orchestral conductor and Michal's older brother. After initially seeing Kaito and Lucia at the airport, he becomes a "bridge" for the two. He observes Kaito's progress in regaining his memories (despite his sister being around) while he checks on Lucia and comforts her as she copes with the loss of her emotional bond. Rihito tries hard to get Michal to realize that she could never be with Kaito even though she doesn't want to hear it. In the anime, when Kaito leaves after telling Michal that he loves Lucia, Rihito restrains Michal from going after Kaito. When Michal is reborn, he promises that he will care for her and raise her again. It is later revealed that both he and Michal are part of the same race as Kaito, Pantharassa, leading Rihito to believe that is the true reason why Michal is so attracted to Kaito. Rihito uses a staff (like Gaito's) in the final battle with Michel, and reveals he's aware of Lucia's mermaid form.
Masahiro is a flirtatious boy who has a crush on Rina. He wears glasses, rides a motorcycle and does some amateur boxing. It is later revealed that he comes from a family running a boxing gym. In the anime, he isn't aware of Rina's mermaid form, but he does understand that she has a reason not to be with him, and wants to know more about Rina and how to love her. In the end, Masahiro is officially Rina's boyfriend. In the manga, he is introduced earlier (before Gaito is even defeated) and is so mysterious that he is only known by his surname. The name "Masahiro" was not created by the animation team, but by Pink Hanamori's staff, as revealed in the fifth volume of the manga.
Nagisa is a young boy who has a crush on Hanon. After retrieving some sheet music for Hanon, he has been wooing her ever since. Unfortunately for him, the sheet music is of the tune Tarō Mitsuki dedicated to Hanon, which only reminds her of her fixation on the much more refined and older man. Still, his resilience is to be admired, and she eventually treats him better. In the manga, he says that he is two years younger than Hanon. In the end, Hanon received a letter from Tarō telling her to move on; falls in love with Nagisa and they have a relationship.
Minor recurring characters Though there are several minor characters on both sides who appear within both the manga and the anime series, the following listed below have played significant roles in the story.
A manga-only character, she is Sara's servant and guardian from childhood, and worries about Sara's involvement with Gaito. The old woman therefore helps the princesses in secret to atone for what her ward has become.