Perhaps there is a crossover event in the fanfiction. Some sort of magic or powerful artifact causes the Naruto universe and the world of Poseidon to collide. Naruto, being the adventurous and powerful character he is, gets involved in this chaos and ends up having a special relationship with Poseidon, either as an ally or having to face him as an adversary.
One possible plot could be that Naruto, as the daughter of Poseidon, discovers her true heritage in a world where ninjas and gods co - exist. She might struggle to balance her ninja training with her new - found godly powers. For example, she could learn to control water in ways that are far beyond normal ninja water jutsu, like creating massive tidal waves or summoning sea creatures to aid her in battle.
Naruto's power in canon is mainly focused on physical combat and ninjutsu. As Poseidon's daughter, she could have the power to communicate with sea creatures. This would give her an edge in intelligence - gathering. She could send fish to spy on enemies in areas near water. Also, her strength could be enhanced when in contact with water, unlike in the original series where her power boost mainly came from the Nine - Tails chakra.
Well, it depends on the specific fanfiction. There are countless fanfictions out there, and each author can take their own liberties. Some might make Bella the daughter of Poseidon to blend different fictional universes or to explore themes of power, family, and destiny. For example, she could be on a quest to discover her true heritage and powers, which would be a common plot in such fan - created stories.
Well, it could be depicted in a complex way. Maybe Bella has always felt a sense of longing for her father, Poseidon. She might have grown up without him really being present, and when they finally interact, there are a mix of emotions. Poseidon could be proud of her but also strict as he expects her to uphold the family name and use her powers responsibly. Their relationship could also be one of mentorship, with Poseidon teaching Bella about the ways of the sea and the divine world.
A fanfiction that stands out is the one where Percy, daughter of Poseidon, goes on a quest to find a lost artifact that has the power to either save or destroy the underwater world. Along the way, she meets various mythical creatures and forms unexpected alliances. The author does a great job of painting a vivid picture of the underwater realm and Percy's growth throughout the story.
One plotline could be that Naruto is chosen by Poseidon to be his champion in the human world. He is given special powers to protect the seas and their secrets from those who would misuse them. Naruto, with his determination, uses these new powers to fight off evil forces that are threatening the ocean's balance.
Well, it could involve Bella having special powers from being Poseidon's daughter. Maybe she can control water to protect Forks from some new supernatural threats. She might also have a connection to the ocean that draws her away from the normal vampire - human drama in the original 'Twilight' story.
Well, it could be about a character from My Hero Academia (MHA) teaming up with the daughter of Poseidon. Maybe they face some common enemies that require both the quirks from MHA world and the powers of the daughter of Poseidon. For example, they might have to fight against some sort of sea - based villains who are causing chaos in both the human world and the world of the gods.
Well, in this 'bella daughter of poseidon fanfiction', a common theme is power. Bella may have to learn to control her powers inherited from Poseidon. This could involve her accidentally causing chaos at first and then gradually mastering her abilities. Love might also be a theme, perhaps a forbidden love as she is part of the divine world. And then there's the theme of discovery, as she discovers the secrets of her father's underwater kingdom and her own place in it.