A key character could be a shape - shifting sea creature named Lyra. Lyra can change into different sea animals and uses this ability to spy on Athena's enemies. Lyra befriends Athena and together they go on adventures. Another character is a human fisherman named Tom. Tom used to be a big threat to the mermaids as he caught a lot of fish, but after meeting Athena, he has a change of heart and becomes an advocate for the protection of the ocean and its inhabitants.
One possible plot could be that Athena, the little mermaid, discovers a hidden power within herself. Maybe she finds a magic pearl that gives her the ability to communicate with sea creatures in a more profound way. She uses this power to protect her underwater kingdom from an impending threat, like a group of over - fishing humans. Along the way, she falls in love with a kind - hearted human who also wants to save the ocean.
Well, Athena herself is of course a main character. She is often depicted as a strong - willed and curious mermaid. There might also be her friends in the underwater world, like other mermaids or sea creatures such as a wise old octopus who gives her advice.
One possible plot could be that Queen Athena has a secret power that she has hidden from the underwater kingdom. In the fanfiction, a young mermaid discovers this power accidentally and Queen Athena has to decide whether to trust the mermaid with this secret or not.
She might be a love rival to Ariel. Suppose a new prince comes to the sea, and Athena also falls in love with him. This could create a triangle situation where Athena uses her charm and wits to win the prince's heart from Ariel. But eventually, she realizes that true love is not about winning but about making others happy.
Prince Eric could be a main character. He would be important as he is Ariel's love interest. Also, King Triton, Ariel's father, could play a significant role as he would be concerned about Ursula's return and want to protect his daughter and the kingdom.
Athena could be a new character in the Little Mermaid fan fiction. She might be a mermaid friend of Ariel's. Maybe she has special powers like being able to communicate with sea creatures even better than Ariel. She could join Ariel on her adventures to explore new parts of the ocean.
She could be described as regal and majestic. With her flowing hair and a crown made of the rarest sea jewels, she commands respect wherever she goes in the underwater kingdom.
Obviously, Percy would be one of the main characters. For the Athena Cabin, it could be Annabeth. Since they already have a pre - existing relationship, it would be interesting to see how a 'lemon' aspect could be added to their story, like exploring a more passionate side of their relationship within the context of the Athena Cabin.
Since we don't know the exact 'athena story', Athena herself is likely to be a main character. If it's a story about her birth, Zeus would also be a main character as he was her father in a very unique way. And if it's a story where she helps mortals, then the mortals she assists, like Odysseus, could be main characters too.
One idea could be that Athena, as a mermaid, discovers a hidden underwater kingdom that has been forgotten by time. She could then embark on a journey to learn about its history and secrets.