A possible plot could involve Percy being adopted by Hera and suddenly having access to new powers or abilities that come with being associated with her. But these powers come with a price. He has to perform certain tasks for Hera. Along the way, he meets other characters from Greek mythology that he wouldn't have interacted with otherwise, like some of Hera's more loyal servants or creatures. This could lead to all sorts of adventures and challenges as Percy tries to balance his old life and his new one under Hera's wing.
One idea could be Percy struggling to fit into Hera's world. Since Hera is known for her complex nature, Percy might constantly be in a battle of wills with her. For example, Hera could try to mold Percy into a more 'proper' hero according to her standards, which clashes with Percy's own free - spirited way of being a hero. Another plot could involve Percy's relationships with other demigods changing. They might be jealous or suspicious of his new status as Hera's adopted son, leading to some interesting conflicts and rivalries within the demigod community.
One plot idea could be Percy having to team up with Hera to rescue a group of demigods who have been captured by an ancient monster. Hera, despite her usual aloofness, realizes she needs Percy's unique skills.
A plot could involve Hera taking Percy on a journey through the past to show him the origins of the gods' power and how it relates to the current problems in the demigod world. This would give Percy a new perspective and knowledge that he can use to save the day. Or perhaps Percy accidentally stumbles upon a secret of Hera's that she's been hiding for centuries, and she has to enlist his help to keep it safe, all while other gods are trying to uncover it too.
One plot idea could be Hera going on a quest with Percy. Since she's a goddess and Percy is a demigod, their dynamic would be really interesting. They could face challenges that test both Hera's divine powers and Percy's wits as a hero. Another idea is a story where Hera loses her memory and Percy has to help her remember who she is while protecting her from other threats in the demigod world. Maybe some monsters would see her in a weakened state as an easy target.
One idea could be Percy struggling to fit into Ares' violent and war - loving family. He might constantly have to prove himself in battles or challenges set by Ares. Another could be Percy having to deal with the other children of Ares being jealous of the attention he gets from their father. He could also be on a mission to redeem Ares' bad reputation among the demigods using his own unique skills and the powers he inherits from Ares.
A more complex plot could be that Hera, in an attempt to make amends for her past actions against demigods, chooses Percy to be her champion in a tournament among the gods' champions. This would put Percy in a very difficult position as he has to face off against other powerful demigods representing different gods. Through this process, Hera and Percy form an unlikely bond as she guides him through the political and dangerous world of godly competitions.
One idea could be Percy having to face a series of trials specifically designed by Hera to prove his worth as her champion. For example, he might have to navigate a maze filled with illusions based on Hera's past grudges.
Well, Percy could be sent on a quest by Hera to reunite broken families in the mortal world. This would be in line with Hera's role as the goddess of family. As he does this, he could encounter various monsters and challenges. Along the way, he might discover that some of these broken families are the result of the interference of other gods or mythical beings. Percy would then have to use his wits and powers (as the son of Hera) to not only fix the families but also deal with the root causes of their problems. This could involve battles, negotiations, and a lot of self - discovery for Percy.
One possible plot could be Percy's struggle with his new identity. Since Hera is the goddess of marriage and family, Percy might find himself in a very different family dynamic. He could be thrust into the middle of godly politics more than ever as Hera's adopted son. For example, he might have to deal with the jealousy of other gods' children who see him as having an unfair advantage.
A plot idea might be that Percy is magically transported to a time when Poseidon and Hera had a major disagreement in the past. He has to use his wits and powers as Poseidon's son to prevent this rift from growing and causing chaos in the present. Also, he could be given a task by Hera to rescue one of her favored heroes who has been trapped by a sea monster under Poseidon's domain. This would put Percy in a tricky situation where he has to balance his loyalty to his father and the task given by Hera. He might also encounter a group of demigods who are descendants of both Poseidon and Hera in some way, and together they have to face a common enemy.