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Cordelia was born deep in the ocean from a Cecaelia (Octopus-like mermaid) woman and a human father. Because of her human heritage, Cordelia was not born as a Cecaelia. As a result she was raised by her dad until she became a teenager.

The next few years of progress for Cordelia in the human world, Cordelia wanted to be someone famous as a child and her father always helped her style her hair like the actresses she saw on TV.

Then, Cordelia's behavior began to change. She was always forbidden from going to the beach or even being around large bodies of water. This made her grow curious, and one day- she dove into the ocean.
The reefs were a beautiful sight, and Cordelia began to spend her days afterschool in the ocean. Until one day, she didn't return home. Right before her enrollment into Triton high school, she was found by Ursula- who promised to grant her great power. Cordelia did not trust her, and as a result, Bartha Mains wiped most of the memories of her father in order to convince Cordelia she was an orphan even if that was not the case.

From the shadows, A young Cordelia appeared beside Bartha Mains. Another Sea-witch under Ursula's training. Ursula taught Cordelia the power of song and how to steal voices while she gave the ancient magic to Bartha Mains. Whenever Cordelia tried to learn any ancient magic for herself, Bartha would wipe her memory of it.

Once Cordelia learned Ursula's evil nature. This resulted in Cordelia running away, but not before her entire memory of Bartha was wiped. That was why she couldn't remember who Bartha Mains or Bartha Collins was when they met.

At first, she agreed to learn magic to protect herself. However, other mermaids started taking advantage of her abilities. Later, it is revealed that Cordelia was learning under Ursula, an evil sea-witch who tried to use a mermaid princess to rule all. After learning this, Cordelia fled from the waters and to the surface- Taking a mysterious spellbook with her.

Once she started wandering the ocean, she fought for her survival and her selfish side started to show when she used her power of song to burn Kyto's hands just to get some scrambled eggs.

After finding Kyto and Buggy on their ship, Cordelia agreed to help them. She has done extensive research on legends and different types of sea-magic. The fact that Kyto and Buggy are criminals didn't seem to bother her. Especially after she realizes the first spellbook was meant to belong to Kyto. After assisting them both, Buggy declared that Cordelia was a friend to them and that she was part of the crew.

Because of her more human appearance, her first job was to go to the police station to help out Kyto. Bartha Mains had kidnapped Kyto's lover, Vidia, in order to use Kyto to rule the seas. Initially, Cordelia thought Bartha Mains was in love with Kyto, but she denied it. Without much luck from the cops, Cordelia tried the mall with the rest of the crew next, but they were nearly captured by Marines.

After this, Cordelia and her friends found Vidia's sister, Koishi and they received help from her, too. She told them, it would take the forces of both Captain Buggy and Captain Luffy's crew to stop Bartha Mains.

On the ship, they put up a huge fight against Mains. It is shown that Cordelia became very powerful over the course of time since she used one of Ursula's famous voice-stealing spells to change Vidia human. With Kyto on board, the spell Cordelia placed on Vidia would break along with Mains' spell.

After this, Cordelia meets Bartha Collins and she is given a second spell-book titled 'Magie De La Mains' - stolen from Ursula and Bartha Mains. The very book Bartha Mains was named after as well. Using this book, Cordelia was able to cast a spell to take Collins and herself back in time to find out the truth about their past.

A few years have probably passed, and Cordelia finds herself on the shores of France. Since their victory against Bartha Mains a first time, the threat of her rises as she's now teamed up with Gaito. In the time between her last adventures and now, Cordelia likely used magic she learned from Ursula to alter her ocean form and make herself half-mermaid. That way, people could see that Cordelia was willing to change for the sake of her friends and the people she cares about. Due to this act, Cordelia may have been granted a Keyblade.

Combined with Ursula's training (before Ursula's death) and the weapons/Keyblade training provided by Yen Sid, Cordelia has become a force to be reckoned with - a Knightess of the Sea. It is quite possible that she knows other Keyblade Wielders.