In fanfiction, if Naruto is part of an older being, it could lead to some really interesting plot twists. For instance, his friends and allies might view him differently. Some might be in awe of his newfound connection, while others might be suspicious or even afraid. This could create a lot of tension within the story. Also, the older being's enemies could now target Naruto, thinking that he holds the key to something related to the older being. This would put Naruto in a whole new set of dangerous situations, and he'd have to find ways to deal with them while also trying to understand his own connection to this mysterious older being.
One possibility is that it would change his physical abilities in combat. The wings could allow him to have greater mobility, like quickly evading attacks or launching surprise aerial assaults. It might also make him a target, as his unique feature would draw attention from both allies and enemies who might be curious or jealous.
One implication could be that Percy has more experience and knowledge. Since he is older, he might have a deeper understanding of the world in the fanfiction. He could be more respected by others due to his age. Also, his relationships might be different. For example, if he has a relationship with someone younger, there could be a dynamic of mentorship or protection.
One implication is a change in his moral compass. Jashinists are often associated with dark and violent practices in the Naruto universe. So if Naruto is a Jashinist in fanfiction, it means he could be involved in actions that go against his original kind - hearted nature.
One implication is that his power levels would be off the charts. Since the Kyuubi is an extremely powerful entity, Naruto would have a whole new set of abilities.
One implication is a change in his combat style. Instead of relying on his shadow clones and Rasengan, he'd use puppets for attacks and defenses. It makes him more versatile in battle.
One implication could be in their training together. Since they are the same age, they might have been in the same training groups in the ninja academy. This could lead to a different kind of friendship compared to what Naruto has with others. They could have pushed each other to be better in their ninja skills.
The implications are far - reaching. His being older than the gods might rewrite the entire mythology of the Percy Jackson universe in the fanfiction. It could lead to new alliances and enmities. Other demigods might look up to him as a new kind of leader, one who has a different kind of wisdom. This could also affect the magical items and their significance. Maybe some items that were once considered powerful because of their god - given nature are now seen as less important compared to whatever ancient power Percy might possess. And the whole concept of fate and prophecy could be turned on its head, as Percy's 'older' status might put him outside the normal flow of destiny as dictated by the gods.
One implication could be that Naruto has enhanced physical abilities. Angels are often depicted as strong and fast, so Naruto might have superhuman strength and speed. He could also have some sort of divine power, like the ability to heal or purify things. Another aspect could be his appearance. Maybe he has wings or a halo that he can hide or show at will.
One implication is a change in his status. He'd have more political power and influence. For example, he could use his position to form alliances between the Whirlpool and Konoha more easily.
One implication is a change in his status. He would be seen as royalty in the context of that fanfiction. This might mean he has certain privileges and responsibilities.