It could be original goddesses created by the author of the fanfiction. They might be based on different elements or aspects of the Naruto universe, like a goddess of chakra, a goddess of the forest where Naruto trains, etc.
The Three Goddesses of Darkness were characters in the online novel Lord of the Mysteries. They were three ancient and evil Great Old Ones. They were Lady of the Night Bernadette Gustav, Hidden Sage Emlyn White, and Angel of Imagination Antigonus. These three Great Old Ones held the authority of Death, Dreams, and Distortion. They were the embodiment of humanity's oldest and strongest fears.
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Athena is definitely important. She's the goddess of wisdom, so she could be a key figure in guiding Percy or giving him cryptic advice. Another is Aphrodite, as she represents love and beauty, and her influence could play a role in any relationship - related subplots. And of course, Poseidon's sister Demeter might be important too, especially if there are any storylines involving nature or the harvest.
A popular one could be Amaterasu, the sun goddess from Japanese mythology. Since Naruto's world has some roots in Japanese culture, it makes sense for her to be included. She might bring her divine powers to Naruto's world and interact with Naruto in unique ways.
Athena is quite popular. She represents wisdom and strategy, so she can add a lot of depth to the story. Percy could learn from her or be in conflict with her plans. Aphrodite is also a favorite. Her domain of love and beauty can create interesting love - related subplots, like making Percy fall for someone against his will or causing jealousy among characters.
The Fall of the Douluo Continent's Goddesses was a novel written by Xiao Wu. The plot of this novel was wonderful, but the specific content and storyline were not mentioned. As the search results provided did not describe the plot and content of the novel in detail, no more information could be provided.
Survival on a Desert Island with the Goddesses was an urban novel. It told the story of the male protagonist who was stranded on a desert island after a plane crash and survived with a group of goddesses. The male protagonist became the man that the goddesses needed the most. They faced the difficulties and challenges on the deserted island together. The specific plot and chapter content could be found in the novel.
The " Goddess Strategy Guide " was a novel about the apocalypse. The story was set in the apocalyptic era when human order collapsed. The novel mainly told the story of a son-in-law. His family was highly regarded because of his brother's excellence, while his own studies and life had always been mediocre. However, in the context of the apocalypse, he improved his status and ability by training the goddess. The specific plot and content could only be understood by reading novels.