Pitchi Pitchi Guardian is a Mermaid Melody AU where Hippo takes the role of Lucia because of a bug that made her non existent in this universe. Inspiration from Name the Fallen AU.

Warning Contains spoilers. Without saying any spoilers, here is a quick review of the roles

Hippo Nanami is the Pink Pearl Guardian Princess who saved Yuuri Pandorin's Life. If he reveals his penguin form or his guardian form to humans, he'll become bubbles, just like when mermaids reveal their identity to humans. Hanon Hosho remains the same but Rina Touin suspects that Yuuri might be a Water Demon ruled by a guy named Gaito. Gaito lost two people seven years ago and is up for revenge. His team consist of the Dark Lovers; Izuru, Eriru and Maria. Also, Karen Ryuhyo joins the team and actually sticks with them. Also there is Core!Frisk. She remains the same. And Eriru plays a slight role in this story.

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This better list of characters contain several spoilers.

Main Characters

Hippo Nanami(Role: The Protagonist)-Replacement For L̴̝̠̞̰̠̺̫̲̟̀̎̽̂̎͌̓͠u̶̢̞͉̤̮̝̟͓̦͈͈͎͐̆͋̽̏̾́͗̃̕͝c̸̛̰͔̼̲͙͍̭̦̺̰̙͉̊̿͋̓̋͘̕į̵̢͈͖̻̱̯̱̩̺̎̓̒̑̈͌̒̾͝a̴̡̛̲͖̬̱͚̯̻͂̊̐̍́̿͌̈́͘͝͝. He is the Pink Pearl Guardian Prince of the North Pacific. He saved Yuuri's life seven years ago. In this universe, Hippo will also turn into bubbles if he reveals his true self.

Yuuri Pandorin(Role: The love interest)-Replacement of Kaito. She used to be a water demon until seven years before the story where she lost her memory. She now is a roller-skater. In episode 14, she found out she had dark powers when encountering Maria.

Hanon Hosho(Role: The friend)-The Aqua Pearl Mermaid Princess of the South Atlantic. Hippo didn't know she was a mermaid princess until episode 9.

Gaito(Role: The Villain)-The king of Panthalassa. He created the dark lovers as well as Yuuri. He lost her, as well as his brother Kaito, seven years before the story.

Eriru(Role: The spinning Girl with MPD(Until episode 11))-A water demon who spins a lot. In episode 10 when she stole Rina's shell locket after she died, only to be worsen when she accidentally wished for it to be useful. After that, She is now known as Erin, the Green Pearl Demon Princess. She gained a new role and a role that is not in the Original, the Water demon princess.

Rina Touin(Role:The cold hearted)-The former green pearl Mermaid Princess of the North Atlantic. She was the first to figure out Yuuri was a water demon. She was proved right when Yuuri started playing the piano in episode 4. Hippo and Hanon turned against her that time. She continued to follow the duo until episode 10 when she accidentally revealed her secret identity.

Karen Ryuhyo(Role: The fourth mermaid)-The Purple Pearl Mermaid Princess of the Southern ocean. She joined the team in episode 28. Didn't know about Noel until episode 27

Core!Frisk(New Role: the mystery girl)-A girl who suddenly appeared out of nowhere in episode 25.

Minor Characters

Nikola Nanami(Role: The Older sister)-She is the older sister of Hippo.

Izuru(Role: The Water dragon woman)-Water demon who is one of the dark lovers.

Tarou Mitsuki(Role: The Piano Player)-A piano player who is Hanon and Sara's love interest. Was the reason for Sara destroying her kingdom.

Maria(Role: The Ice Girl)-Water demon who is one of the dark lovers.

Meru(Role: The Loli demon(Temporarily))-A South Atlantic Mermaid who is a Dark Lover from episode 18-24.

Sara(Role: The evil mermaid)-The Orange Pearl Mermaid Princess of the Indian Ocean. She is Gaito's lover. She also caused the tidal wave that killed Kaito.

L̴̝̠̞̰̠̺̫̲̟̀̎̽̂̎͌̓͠u̶̢̞͉̤̮̝̟͓̦͈͈͎͐̆͋̽̏̾́͗̃̕͝c̸̛̰͔̼̲͙͍̭̦̺̰̙͉̊̿͋̓̋͘̕į̵̢͈͖̻̱̯̱̩̺̎̓̒̑̈͌̒̾͝a̴̡̛̲͖̬̱͚̯̻͂̊̐̍́̿͌̈́͘͝͝(New role: The goner Girl)-Does not exist in this universe. Also known as Goner!Lucia.

Kaito(New role: The fallen Brother)-Died seven years ago at a boat accident which was caused by Sara.

Sheshe(Role: The older Black beauty girl)-One of the Black Beauty sisters.

Mimi(Role: The younger Black Beauty girl)-One of the Black Beauty sisters.

Noel(Role: The twin)-The Indigo Pearl Mermaid Princess of the Arctic Ocean.

Coco(Role: The Cassanova)-The Yellow Pearl Mermaid Princess of the South Pacific.