The dynamic between Poseidon and his son, Percy (in the original), would be completely flipped. Instead of a father - son relationship, they would be more like two separate entities with Poseidon now in Percy's role. Poseidon would have to face the same challenges Percy did, but without the advantage of Percy's unique experiences as a demigod growing up.
With Poseidon replacing Percy, his relationship with the other gods would be altered significantly. In Percy's case, he was often seen as an upstart by some gods, but Poseidon is a full - fledged god himself. So, there would be a different power dynamic at play. Some gods might be more deferential to him, while others might be more envious or resentful that he's meddling in the affairs of mortals in Percy's stead.
His character could change in several ways. He would have a new sense of identity. No longer just a demigod with powers, but now something more 'aquatic'. He might be more curious about his father's world and want to spend more time there. This could lead to some conflict with his human side, as he has to balance his life on land and his new underwater existence. Also, he could become more of a leader among the sea creatures, as he has a unique connection to them through the tail.
Well, in this kind of fanfiction, Poseidon could replace Percy in his relationships too. He might interact differently with Annabeth. Since he's a god, his approach to their friendship or potential romantic relationship would be very different from Percy's. He could offer her godly knowledge and wisdom in a way Percy couldn't. And with his other friends like Grover, Poseidon would probably be more of a mentor figure, guiding them with his vast experience as a god.
Poseidon would bring a whole new set of powers and a different kind of leadership style to the Avengers. His control over the seas and water - based powers could be used in various ways, like creating barriers or using water to put out fires during battles. In terms of dynamics, he could be a bit of a wildcard. He might not always follow the Avengers' rules, but his intentions would be good. For example, he might decide to take on a powerful enemy alone, thinking he can handle it, which could cause some tension within the team.
The plot would take on a more action - oriented and heroic tone. Naruto is a hero at heart, always looking to protect the weak and fight for what's right. In contrast to Riser, he would actively seek out problems to solve and villains to defeat. His presence would also attract different kinds of antagonists, those who oppose his ideals of peace and justice, which would create a whole new set of storylines.
Well, it would first of all bring two very different aspects of Greek mythology together. Percy represents the more heroic, chaotic side of Poseidon's descendants. Artemis is all about the hunt, chastity, and the moon. Their union in a fanfic could create new power dynamics. For instance, new magical abilities might be created from their combined influence. Maybe there could be a new form of magic related to water and the moon.
The story would take a different turn in terms of character development. Kimmimaro was mainly focused on serving Orochimaru and proving his worth through his strength. Naruto, however, is driven by his dreams of becoming Hokage and protecting his friends. So, if Naruto replaces Kimmimaro, the focus of the story would shift from loyalty to a dark master to more noble goals. This would also impact how other characters in the story view and interact with the character in Kimmimaro's place.
The character dynamics would change significantly. Other characters who were close to Oz, like Glynda, would have to adjust to the new 'Oz' (the reincarnated 'Si'). They might sense that something is different about this Oz. The relationships with the main characters, like Ruby, Weiss, Blake, and Yang, would also be different. This new Oz might have a different approach to mentoring them or guiding them in their fight against the Grimm.
The father - son relationship would be completely turned on its head. Instead of Gabriel being the strict and often distant father, Adrien would be in that role. He might be more understanding and lenient towards himself (in Gabriel's body). And Gabriel, as Adrien, would have to deal with a father - like figure in Adrien's real father. This would create a very strange and new dynamic between them.
The character dynamics would change a lot. For example, Iron Man might see Spider - Man as a protege in this fanfiction. He could be more protective and try to mentor Spider - Man. Meanwhile, Thor might find Spider - Man's small - scale heroics amusing compared to his own grand battles. Hulk could be a bit unpredictable around Spider - Man, either scaring him or having an odd friendship develop.
He'd be more in tune with the sea. He might be calmer, like the ebb and flow of the ocean. His reactions to things would be more measured as he's used to the slow, powerful nature of the sea. For example, instead of getting angry quickly, he'd wait and think like the sea does before a big wave hits.