Percy's relationship with the gods would be completely turned upside down. Instead of being seen as a hero by them, he would be an enemy. They would likely try to stop him from using any of Kronos' powers. And Percy would probably feel a sense of resentment towards the gods for how they've treated him once his true parentage is revealed, leading to a very hostile relationship.
His relationship with Annabeth would be really strained. Annabeth is a firm believer in the gods, and if Percy is the son of Kronos, she would be very suspicious and probably feel betrayed. She might even try to fight Percy at first, thinking he's a threat to her and her friends.
With Grover, it would be different too. Grover would be very conflicted. On one hand, he's Percy's friend, but on the other, he's a satyr who serves the gods. He might try to convince Percy to reject his Kronos heritage and come back to the side of the gods. It would be a tough situation for their friendship.
His relationship with Annabeth would be very strained at first. She might be very suspicious of him and his motives, given his relation to Kronos. But as she sees Percy struggling against the dark influence, she could come to his side and help him. Their relationship would then become deeper as they face this new challenge together.
His relationship with Annabeth would become more complicated. She might be initially suspicious of Percy's new connection to Hades, but then come to accept it as part of who he is. Percy would also have a new dynamic with the other demigods. Some might fear him because of his link to the underworld, while others might be curious and want to learn more about his powers.
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 the gods would be super interesting. The gods would be very wary of him. Zeus, in particular, would probably want to keep an eye on him or even try to eliminate him. But some of the more benevolent gods, like Poseidon (even though he's not Percy's father in this fanfiction), might give him a chance. Percy would have to navigate this tricky political situation among the gods while also trying to find his place in the world.
With the other demigods, Percy could become an outcast at first. They might see his adoption by Erebus as something unnatural or dangerous. But as time goes on, if Percy uses his new powers and influence for good, he could gradually regain their trust and respect. For example, he could use his shadow - related abilities to help in battles or rescue missions, showing that he's still on their side.
His relationship with Annabeth would be severely strained. Annabeth, who has always known Percy as Poseidon's son, would be confused and a bit distrustful. She might think Percy has been lying to her all this time. His friends at Camp Half - Blood would also be divided. Some would be scared of his new powers and his connection to Tartarus, thinking he could be a danger. However, some might be more understanding, especially those who have faced their own identity crises. His relationship with the gods would also change. The gods who were once somewhat friendly or at least neutral towards him might now see him as a threat. Zeus, for example, would be extremely wary of Percy's Tartarus - related abilities.
Percy would likely become more conflicted. His previous identity as the son of Poseidon shaped his values and actions. But as the son of Kronos and Rhea, he'd have to reevaluate everything. He might become more cautious, as he now represents a more controversial lineage.
His relationship with Annabeth would likely be strained at first. Annabeth might be skeptical or even a bit afraid of Percy's new 'Ares - side' as the god of war is not exactly known for his peaceful nature. However, over time, she could come to understand and accept this new part of Percy.
His relationship with Annabeth would likely be different. With Hestia's influence, Percy might become more domesticated. Annabeth could be both intrigued and a bit confused by this new side of Percy. She might initially be skeptical of Hestia's adoption but later see the positive changes in Percy.
Percy's relationship with the other campers at Camp Half - Blood would be a rollercoaster. The children of Poseidon might feel a bit betrayed or confused, as they thought Percy was one of their own. However, Percy could use his new status to bridge gaps between different cabins. For example, he could work with the children of Aphrodite to improve relationships in the camp, since Hera has some connection to love and relationships in a different way than Aphrodite. With the gods, his relationship with Zeus would be extremely strained, given Zeus's past issues with Hera. But he might find new allies among the gods who are friendly with Hera, like Hephaestus. Overall, Percy's relationships would be a mix of challenges and new opportunities.