It could be a mentor - mentee relationship. Rhea, with her vast knowledge, could mentor the three. Percy might look up to her for guidance on his powers. Thalia could learn about her family's history from Rhea. Nico could gain insights on the gods' relationships from her.
They could be like siblings. Percy and Thalia might act as the older siblings, protecting and guiding Nico. Percy, with his leadership skills, and Thalia, with her combat abilities, would be great at looking out for the younger Nico. They could also be like cousins, with a close - knit bond but still having their own individual family heritages that sometimes create interesting dynamics.
In fanfiction, they might have an epic adventure. Percy could use his water powers to protect them if they encounter any danger. Thalia with her lightning might strike down foes. Nico could summon the dead to get information. Rhea might offer them some ancient wisdom or a special quest to save the world.
At first, it might be rocky. Percy is more of a laid - back hero, Nico is the quiet and often misunderstood one, and Jason is the dutiful leader type. But as they spend more time together, they start to see the good in each other. Percy might teach them how to have fun and not take everything so seriously. Nico could show them the power of the underworld and its secrets. And Jason would bring a sense of discipline and strategy to their group.
Their relationships could develop in many ways. At first, Percy and Thalia might have some friendly bickering as they used to, but with Nico there, they start to form a more united front. Nico, being a bit more withdrawn, might gradually open up to them more as they face challenges together. Percy could use his natural leadership skills to bring them together, and Thalia's fierce loyalty would make her a great ally for both of them. As they rely on each other more in the chaotic situations, their bonds would strengthen into deep friendships.
Percy and Nico might grow closer as they face new challenges together in Hogwarts. Thalia could initially be a bit of an outsider to their relationship but then gradually become more involved. Percy could act as a mediator between Nico and Thalia at times.
In highschool fanfiction, their relationships could develop in many ways. Percy and Nico could bond over their shared experiences of being different. Percy might help Nico come out of his shell and make more friends. Thalia would be like an older sister figure to both of them. She would protect them from any mean - spirited students. As time passes, they would have sleepovers at each other's houses (or cabins in Percy's case), and during these times, they would share stories and secrets, strengthening their relationships.
The story would develop with them exploring the Chaos realm. They might discover ancient secrets and long - lost powers. Their relationships with each other would evolve. For example, Thalia and Nico might bond over their shared experiences in the face of the new and terrifying things in the Chaos realm. Percy could act as the mediator between them at times. They would also have to deal with the politics and power struggles within the Chaos realm. There could be factions that want to use them for their own ends, and they would have to navigate through these tricky situations while still trying to achieve their own goals.
In some fanfictions, their relationship might develop because of a common enemy. The threat of this enemy forces them to put aside any differences and work together closely. As they do this, they start to see the good in each other. Nico might see Percy's leadership skills, and Percy might see Nico's hidden strength and loyalty. They gradually become closer friends or even something more, depending on the nature of the fanfiction.
You can start by having them share a common goal. For example, they both need to retrieve a powerful artifact that has been stolen and is being used for evil. As they search for it, they face obstacles that force them to rely on each other. This builds trust gradually.
One challenge is the jealousy of other gods. Since they are new gods, the older, more established gods might not like the attention they get or the new ideas they bring. Another challenge is controlling their powers. As mentioned before, going from demigod to god means a huge jump in power level, and it's not easy to get used to. For example, Percy might accidentally flood a city while trying to create a small puddle for fun.