His relationship with the gods would be complex. The gods who are friends with Ares might be more favorable towards Percy. However, the ones who dislike Ares, like Poseidon in some ways, might be disappointed in Percy. Poseidon might worry that Percy is being led astray by Ares and could try to persuade him to give up this new role.
His relationship with Annabeth might change. She could be both impressed and a bit jealous of his new skills related to Hephaestus. Percy would now have an area of expertise that she doesn't fully understand. With the Hephaestus kids, he might start as an outsider but gradually earn their respect as he proves himself in tasks related to their father's domain.
If Percy becomes the Champion of Chronos, his relationship with his father Poseidon would be complex. Poseidon might try to free Percy from Chronos' influence. Percy's relationships with his fellow demigods would be full of suspicion. They would be constantly watching him to see if he shows signs of following Chronos' evil intentions. However, Percy could also use this new position to bring together characters who were previously at odds. For instance, he could broker a truce between two warring groups in the demigod world by showing them the greater threat of Chronos.
With his friends like Grover, Percy would seem like a completely different person. Grover is used to Percy's emotions guiding his actions. Now, Percy would be cold and calculating. His friends would have to constantly remind themselves that this is still Percy, but it would be hard for them to connect on the same level. They might start to doubt if they can still trust him, as his lack of emotions could make his decisions seem unpredictable.
His relationship with Annabeth would be different. She might be a bit more cautious at first, as Percy's new heritage from Oceanus could bring unforeseen challenges. But they would also have a new level of respect for Percy's increased power. With his other friends like Grover, they might look up to him more, seeing him as having an even greater destiny. However, some characters might be jealous or suspicious of Percy, like some of the children of Poseidon who might feel overshadowed.
Percy's relationship with the gods would definitely change. They would see him as a threat, especially if he stole a power that was close to their domain. Zeus, for instance, would be furious and might send all kinds of challenges and threats Percy's way, which would put Percy in a very difficult position.
His relationship with Annabeth could become more complex. Since Percy has this new role as the Champion of Aether, Annabeth might feel a bit left out or worried that he's getting too powerful. His friendships with other demigods at Camp Half - Blood could also shift. Some might look up to him more, while others might be envious. And his relationship with the gods could change too. The gods might see him as a more important figure and try to use him for their own purposes.
Percy's relationship with his father, Poseidon, could be a bit strained. Poseidon might not understand this strange 'Jedi' thing that his son is so into. He could see it as a distraction from Percy's duties as a demigod. However, Percy could try to convince his father that there are similarities between the power of the sea and the Force. With his friends from Camp Half - Blood, those who are more open - minded would be excited to learn about the Jedi ways from Percy. They would engage in discussions about how Jedi ethics can be applied in their demigod lives. But the more conservative demigods might see Percy as a threat to their traditional values and try to isolate him.
His relationship with Annabeth would be different. She'd have to get used to this new side of Percy. There might be some initial tension as she tries to understand his ice powers and how they fit into their relationship. His friends at Camp Half - Blood would also be in awe and a bit cautious. They'd respect his new power but might not know how to act around him at first. Some might even be jealous.
The relationship with Poseidon would be extremely complicated. Poseidon would be torn between his love for Percy and his fear of what Percy could become as Kronos' twin. He might try to distance himself from Percy at first, which would deeply hurt Percy. On the other hand, Percy's relationship with some of the minor gods might improve. Since they are often overlooked by the major gods, they might see Percy as a potential ally in changing the status quo. Percy's relationship with Luke, if he were still alive in this fanfiction, would also be interesting. Luke might try to use Percy's connection to Kronos to his advantage, but Percy would have to be careful not to be manipulated by Luke.
His relationship with Annabeth would definitely be affected. She might be a bit wary at first, since Nyx is such an unknown and powerful entity. But she would also be there to support Percy as he figures things out.